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INTRODUCTION 

The NASA Combined File Postings Statistics is published semiannually {January and July). T

alphabetical listing of postable subject terms contained in the NASA Thesaurus is used to disp

the number of postings {documents) indexed by each subject term from 1968 to date. The posti

totals per term are separated by announcement or other media into STAR, IAA, NLN, and OTH

columnar entries covering the NASA document collection {1968 to date). 

Over 595,000 book postings for NALNET Books held by NASA Libraries are included under 

NLN column. CSTAR postings as well as some previously unreported series are listed under 

"other" column. 

File postings statistics for the Alternate Data Base covering NASA collection from 1962 thro

1967 were published on a one-time basis in September 1975. Subject terms for the Alternate D

Base are derived from the Subject Authority List, reprinted 1985, which is available upon reque

The distribution of 18,748,083 postings among the 17,304 Thesaurus terms is tabulated on the 

page of Combined File Postings Statistics. 

NASA STI Facility, January 1

NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

A STARS N 72 1710 10 38 

A-1 AIRCRAFT N 1 1 1 9 

A-10 AIRCRAFT N 39 69 0 143 

A-2 AIRCRAFT N 1 0 0 1 

A-3 AIRCRAFT N 1 2 0 26 

A-300 AIRCRAFT N 53 106 0 12 

A-310 AIRCRAFT N 23 30 0 5 

A-320 AIRCRAFT N 34 72 0 14 

A-37 AIRCRAFT N 11 1 0 19 

A-4 AIRCRAFT N 20 17 0 207 

A-5 AIRCRAFT N 0 0 0 30 

A-6 AIRCRAFT N 26 36 0 268 

A-7 AIRCRAFT N 98 109 2 464 

A-9 AIRCRAFT N 0 2 0 3 

AAP 1 MISSION N 1 0 0 8 

AAP 2 MISSION N 0 0 0 9 

AAP 3 MISSION N 0 0 0 3 

AAP 4 MISSION N 0 0 0 5 

ABDOMEN N 17 63 3 20 

ABEL FUNCTION N 174 225 31 105 

ABERRATION N 201 1237 29 93 

ABILITIES N 294 71 104 295 

ABIOGENESIS N 56 745 13 52 

ABLATION N 701 996 21 1142 

ABLATIVE MATERIALS N 431 647 11 820 

ABLATIVE NOSE CONES N 55 189 0 124 

ABLESTAR LAUNCH VEHICLE N 11 2 0 4 

ABNORMALITIES N 284 385 20 205 

ABORIGINES N 1 4 9 2 

ABORT APPARATUS N 34 24 4 129 

ABORT TRAJECTORIES N 64 47 1 198 

ABORTED MISSIONS N 95 72 3 265 

ABRASION N 241 197 27 180 

ABRASION RESISTANCE N 176 245 3 179 

ABRASIVES N 137 119 17 99 

ABRIKOSOV THEORY N 5 18 0 1 

ABSOLUTE ZERO N 5 7 2 8 

ABSORBENTS N 147 86 12 102 

ABSORBERS N 15 17 3 14 

ABSORBERS (EQUIPMENT) N 88 59 1 85 

ABSORBERS (MATERIALS) N 362 776 8 277 

ABSORPTANCE N 227 450 1 116 

ABSORPTION N 422 229 50 351 

ABSORPTION COOLING N 58 28 1 13 

ABSORPTION CROSS SECTIONS N 620 1024 3 223 

ABSORPTION SPECTRA N 3074 9363 183 1484 1

ABSORPTION SPECTROSCOPY N 459 856 46 232 

ABSORPTIVITY N 915 2802 9 531 

ABSTRACTS N 1968 36 372 1989 

ABUNDANCE N 773 10601 43 174 1
NASA COMBINED FILE POSTING STATISTICS 

910117 

**=t=  SUBJECT TERM ** ***** TYPE STAR IAA NLN OTHER 

AC GENERATORS N 258 210 12 247 

ACCELERATED LIFE TESTS N 617 782 14 559 

ACCELERATING AGENTS N 35 12 5 22 

ACCELERATION N 80 126 3 114 

ACCELERATION (PHYSICS) N 1475 2012 64 1165 

ACCELERATION PROTECTION N 53 92 1 36 

ACCELERATION STRESSES (PHYSIOLOGY) N 655 1011 25 183 

ACCELERATION TOLERANCE N 505 516 14 178 

ACCELERATORS N 83 103 6 74 

ACCELEROMETERS N 987 1126 31 1059 

ACCEPTABILITY N 541 123 27 2839 

ACCEPTOR MATERIALS N 116 368 5 46 

ACCESS CONTROL N 317 94 52 129 

ACCESS TIME N 108 127 1 66 

ACCESSORIES N 28 27 7 37 

ACCIDENT INVESTIGATION N 218 97 36 205 

ACCIDENT PREVENTION N 673 402 129 460 

ACCIDENT PRONENESS N 22 23 5 5 

ACCIDENTS N 366 64 130 362 

ACCLIMATIZATION N 96 72 15 62 

ACCOMMODATION N 32 23 2 7 

ACCOMMODATION COEFFICIENT N 34 244 2 20 

ACCOUNTING N 61 10 114 54 

ACCRETION DISKS N 247 1610 2 48 

ACCUMULATIONS N 93 58 4 150 

ACCUMULATORS N 253 208 15 310 

ACCUMULATORS (COMPUTERS) N 29 28 1 17 

ACCURACY N 3630 3275 42 2509 

ACEE PROGRAM N 84 17 5 26 

ACETALDEHYDE N 26 57 1 11 

ACETALS N 21 9 3 16 

ACETANILIDE N 0 4 0 1 

ACETATES N 170 83 7 143 

ACETAZOLAMIDE N 6 13 0 3 

ACETIC ACID N 102 74 3 81 

ACETONE N 141 135 2 113 

ACETONITRILE N 153 174 0 12 

ACETYL COMPOUNDS N 81 124 8 83 

ACETYLACETONE N 16 10 0 16 

ACETYLATION N 9 7 2 8 

ACETYLENE N 339 557 26 183 

ACETYLSALICYLIC ACID N 2 4 0 8 

ACHIEVEMENT N 23 8 34 17 

ACHONDRITES N 31 355 2 28 

ACID BASE EQUILIBRIUM N 123 168 21 43 

ACID RAIN N 426 316 72 156 

ACIDITY N 180 153 9 90 

ACIDOSIS N 19 73 4 10 

ACIDS N 375 193 80 373 

ACOUSTIC ATTENUATION N 681 1262 35 427 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ACOUSTIC COUPLING N 47 77 0 11 

ACOUSTIC DELAY LINES N 131 281 2 116 

ACOUSTIC DUCTS N 210 637 2 62 

ACOUSTIC EMISSION N 605 1372 37 233 

ACOUSTIC EXCITATION N 292 961 4 137 

ACOUSTIC FATIGUE N 94 180 9 71 

ACOUSTIC FREQUENCIES N 57 88 0 11 

ACOUSTIC IMPEDANCE N 311 476 5 163 

ACOUSTIC INSTABILITY N 84 340 4 60 

ACOUSTIC LEVITATION N 61 58 0 91 

ACOUSTIC MEASUREMENT N 2052 1953 87 1182 

ACOUSTIC MICROSCOPES N 71 94 1 21 

ACOUSTIC NOZZLES N 21 54 0 13 

ACOUSTIC PROPAGATION N 556 1737 25 357 

ACOUSTIC PROPERTIES N 1015 533 59 716 

ACOUSTIC RETROFITTING N 12 12 0 3 

ACOUSTIC SCATTERING N 462 634 21 249 

ACOUSTIC SIMULATION N 126 127 1 61 

ACOUSTIC SOUNDING N 105 369 1 113 

ACOUSTIC STREAMING N 36 93 1 17 

ACOUSTIC VELOCITY N 727 1062 17 387 

ACOUSTICAL HOLOGRAPHY N 90 270 29 67 

ACOUSTICS N 1392 316 377 1730 

ACOUSTO-OPTICS N 472 1783 53 365 

ACQUISITION N 244 80 39 661 

ACRIFLAVINE N 3 0 0 0 

ACROLEINS N 9 7 3 5 

ACRYLATES N 85 38 1 81 

ACRYLIC ACID N 49 15 2 58 

ACRYLIC RESINS N 376 194 25 363 

ACRY LONITR I LES N 131 158 10 150 

ACTINIDE SERIES N 90 44 16 52 

ACTINIDE SERIES COMPOUNDS N 50 6 7 23 

ACTINIUM N 20 7 3 10 

ACTINOMETERS N 89 154 10 62 

ACTINOMYCETES N 6 4 5 8 

ACTINOMYCIN N 2 7 0 1 

ACTIVATED CARBON N 146 34 11 132 

ACTIVATED SLUDGE N 66 31 2 34 

ACTIVATION N 258 72 13 250 

ACTIVATION (BIOLOGY) N 68 100 6 48 

ACTIVATION ANALYSIS N 233 77 34 106 

ACTIVATION ENERGY N 1066 2401 6 428 

ACTIVE CONTROL N 588 960 4 198 

ACTIVE GALACTIC NUCLEI N 233 1312 0 22 

ACTIVE GALAXIES N 82 471 0 28 

ACTIVE SATELLITES N 14 17 0 18 

ACTIVITY N 7 19 2 22 

ACTIVITY (BIOLOGY) N 245 480 70 129 

ACTIVITY CYCLES (BIOLOGY) N 114 179 20 77 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM •*"'**** TYPE STAR IAA NLN OTHER 

ACTS N 35 50 0 21 

ACTUATION N 57 38 1 82 

ACTUATOR DISKS N 45 76 0 18 

ACTUATORS N 1270 1466 25 1181 

ACUITY N 20 9 0 16 

ACYLATION N 17 12 6 14 

ADA (PROGRAMMING LANGUAGE) N 715 366 65 172 

ADAPTATION N 739 819 120 651 

ADAPTERS N 72 60 0 237 

ADAPTIVE CONTROL N 1712 3869 187 1095 

ADAPTIVE FILTERS N 405 1591 17 176 

ADAPTIVE OPTICS N 99 526 13 167 

ADDING CIRCUITS N 73 195 5 42 

ADDITION N 60 74 4 88 

ADDITION RESINS N 29 7 3 20 

ADDITION THEOREM N 13 15 4 7 

ADDITIVES N 1807 2809 106 1243 

ADDRESSING N 166 215 18 92 

AODUCTS N 20 12 0 19 

ADENINES N 17 44 3 8 

ADENOSINE DIPHOSPHATE N 18 59 0 9 

ADENOSINE TRIPHOSPHATE N 106 245 0 57 

ADENOSINE$ N 19 90 7 11 

ADENOVIRUSES N 2 0 0 5 

ADEQUACY N 9 9 1 2 

ADHESION N 804 556 71 566 

ADHESION TESTS N 257 565 6 138 

ADHESIVE BONDING N 981 2065 79 653 

ADHESIVES N 722 636 173 1041 

ADIABATIC CONDITIONS N 800 2461 23 366 

ADIABATIC DEMAGNETIZATION COOLING N 9 6 0 1 

ADIABATIC EQUATIONS N 105 213 4 46 

ADIABATIC FLOW N 150 466 0 52 

ADIPOSE TISSUES N 32 76 3 26 

AOIPRENE (TRADEMARK) N 3 1 0 5 

ADIRONDACK MOUNTAINS (NY) N 16 17 0 6 

ADJOINTS N 130 220 5 30 

ADJUSTING N 216 149 18 217 

ADMIXTURES N 64 106 2 58 

ADRENAL GLAND N 94 192 11 77 

ADRENAL METABOLISM N 102 286 3 39 

ADRENERGIC$ N 28 169 11 9 

ADRENOCORTICOTROPIN (ACTH) N 39 81 5 20 

ADRIATIC SEA N 16 22 0 3 

ADSORBENT$ N 121 49 7 60 

ADSORPTION N 1509 1312 176 778 

ADSORPTI V ITY N 50 34 6 31 

ADVANCED LAUNCH SYSTEM (STS) N 29 88 0 84 

ADVANCED RANGE INSTRUMENTATION AIRCRAFT N 0 6 0 1 

ADVANCED RANGE INSTRUMENTATION SHIP N 1 1 0 137 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ADVANCED RECONN ELECTRIC SPACECRAFT N 1 0 0 1 

ADVANCED SODIUM COOLED REACTOR N 4 0 0 2 

ADVANCED SOLID ROCKET MOTOR (STS) N 1 0 0 2 

ADVANCED TECHNOLOGY LABORATORY N 3 5 0 7 

ADVANCED TEST REACTORS N 25 0 0 14 

ADVANCED VERY HIGH RESOLUTION RADIOMETER N 206 613 0 90 

ADVANCED VIDICON CAMERA SYSTEM (AVCS) N 12 8 1 176 

ADVECTION N 375 718 2 117 

ADVENT PROJECT N 0 1 0 8 

AEOLIAN TONES N 30 3 0 8 

AEOLOTROPISM N 4 24 1 3 

AEPS N 2 2 0 2 

AERATION N 130 46 13 69 

AERIAL EXPLOSIONS N 136 114 2 329 

AERIAL PHOTOGRAPHY N 2577 3793 302 1615 

AERIAL RECONNAISSANCE N 1039 780 48 2329 

AERIAL RUDDERS N 68 93 2 79 

AEROACOUSTICS N 354 1320 19 247 

AEROASSIST N 100 230 0 86 

AEROBATICS N 4 36 4 4 

AEROBEE ROCKET VEHICLE N 117 140 2 302 

AEROBES N 61 72 7 35 

AEROBIOLOGY N 44 20 15 19 

AEROBRAKING N 80 159 0 65 

AEROCAPTURE N 12 67 0 6 

AERODYNAMIC BALANCE N 208 288 6 183 

AERODYNAMIC BRAKES N 48 141 4 59 

AERODYNAMIC CHARACTERISTICS N 5181 5346 188 6757 1

AERODYNAMIC COEFFICIENTS N 1687 2156 13 1297 

AERODYNAMIC CONFIGURATIONS N 3019 1695 94 3521 

AERODYNAMIC DRAG N 1543 2603 47 1354 

AERODYNAMIC FORCES N 1278 1825 49 1127 

AERODYNAMIC HEAT TRANSFER N 176 266 6 219 

AERODYNAMIC HEATING N 696 1022 33 1236 

AERODYNAMIC INTERFERENCE N 472 728 18 318 

AERODYNAMIC LOADS N 1648 1612 46 1944 

AERODYNAMIC NOISE N 768 1305 46 440 

AERODYNAMIC STABILITY N 1318 1175 69 1418 

AERODYNAMIC STALLING N 623 987 17 460 

AERODYNAMICS N 2203 2119 966 2714 

AEROELASTIC RESEARCH WINGS N 15 12 0 8 

AEROE LAST I CITY N 1477 2346 94 996 

AEROEMBOLISM N 45 64 2 19 

AEROGELS N 0 1 0 0 

AERO LOGY N 209 231 8 129 

AEROMAGNETI SM N 12 28 0 2 

AEROMANEUVERING N 20 44 0 13 

AEROMANEUVERING ORBIT TO ORBIT SHUTTLE N 6 6 0 3 

AERONAUTICAL ENGINEERING N 1222 598 689 1174 

AERONAUTICAL SATELLITES N 41 90 1 4 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM •*-***** TYPE STAR IAA NLN OTHER 

AERONAUTICS N 504 251 1057 374 

AERONOMY N 374 678 19 273 

AEROQUATIC VEHICLES N 2 5 1 4 

AEROS SATELLITE N 47 147 2 11 

AEROSAT SATELLITES N 19 26 1 4 

AEROSINUSITIS N 0 6 0 0 

AEROSOLS N 3354 5630 213 2364 1

AEROSPACE ENGINEERING N 1759 1722 425 1732 

AEROSPACE ENVIRONMENTS N 2131 1299 273 1921 

AEROSPACE INDUSTRY N 640 1393 212 1025 

AEROSPACE MEDICINE N 3969 3469 425 1632 

AEROSPACE PLANES N 118 301 5 203 

AEROSPACE SAFETY N 200 252 14 49 

AEROSPACE SCIENCES N 636 489 422 898 

AEROSPACE SYSTEMS N 672 855 115 1089 

AEROSPACE TECHNOLOGY TRANSFER N 271 382 43 209 

AEROSPACE VEHICLES N 419 332 136 618 

AEROSTATICS N 23 26 3 13 

AEROTHERMOCHEMISTRY N 54 256 10 49 

AEROTHERMODYNAMICS N 579 1278 54 1091 

AEROTHERMOELASTICITY N 14 40 1 18 

AEROZINE N 24 8 0 49 

AFFERENT NERVOUS SYSTEMS N 36 331 5 21 

AFFINITY N 26 83 4 21 

AFGHANISTAN N 7 1 13 4 

AFRICA N 466 471 203 293 

AFRICAN RIFT SYSTEM N 19 10 1 7 

AFTERBODIES N 354 317 0 311 

AFTERBURNING N 243 239 0 351 

AFTERGLOWS N 128 333 9 57 

AFTERIMAGES N 16 133 2 3 

AGE FACTOR N 161 881 52 70 

AGENA A ROCKET VEHICLE N 0 1 0 0 

AGENA B RANGER PROGRAM N 0 0 0 2 

AGENA 8 ROCKET VEHICLE N 4 3 0 25 

AGENA C ROCKET VEHICLE N 0 1 0 2 

AGENA D ROCKET VEHICLE N 46 2 0 14 

AGENA ROCKET VEHICLES N 42 36 2 164 

AGENTS N 3 0 6 28 

AGGLOMERATION N 164 138 9 128 

AGGLUTINATION N 17 76 1 10 

AGGREGATES N 155 99 25 193 

AGING N 21 59 6 36 

AGING (BIOLOGY) N 152 219 197 118 

AGING (MATERIALS) N 996 713 18 1150 

AGING (METALLURGY) N 433 2146 4 297 

AGITATION N 31 12 1 18 

AGREEMENTS N 61 131 21 359 

AGRICULTURAL AIRCRAFT N 36 44 8 24 

AGRICULTURE N 2168 1005 611 1202 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM .. ****** TYPE STAR IAA NLN OTHER 

AGRISTARS PROJECT N 429 48 2 82 

AGROCLIMATOLOGY N 92 26 16 37 

AGROMETEOROLOGY N 135 49 12 80 

AGROPHYSICAL UNITS N 4 0 0 0 

AH-1G HELICOPTER N 23 15 0 20 

AH-63 HELICOPTER N 0 2 0 1 

AH-64 HELICOPTER N 24 106 0 46 

AIDS N 3 0 3 6 

AILERONS N 171 220 1 193 

AIR N 1054 1313 49 893 

AIR BAG RESTRAINT DEVICES N 29 13 1 33 

AIR BREATHING BOOSTERS N 15 21 0 31 

AIR BREATHING ENGINES N 294 465 17 771 

AIR CARGO N 194 421 45 252 

AIR CONDITIONING N 507 334 216 358 

AIR CONDITIONING EQUIPMENT N 258 199 48 354 

AIR CONDUCTIVITY N 18 37 0 12 

AIR COOLING N 371 752 10 242 

AIR CURRENTS N 209 187 7 109 

AIR CUSHION LANDING SYSTEMS N 29 27 3 23 

AIR DATA SYSTEMS N 55 54 0 53 

AIR DEFENSE N 250 340 29 2283 

AIR DROP OPERATIONS N 41 19 0 156 

AIR DUCTS N 119 113 14 76 

AIR FILTERS N 291 173 11 182 

AIR FLOW N 1823 3524 63 1053 

AIR INTAKES N 269 368 7 307 

AIR JETS N 200 688 6 95 

AIR LAND INTERACTIONS N 226 710 6 78 

AIR LAUNCHING N 74 149 0 623 

AIR LAW N 29 364 22 6 

AIR LOCKS N 40 31 0 44 

AIR MAIL N 6 6 6 5 

AIR MASSES N 370 552 16 163 

AIR NAVIGATION N 704 2160 189 562 

AIR PIRACY N 23 106 15 21 

AIR POLLUTION N 7425 6808 955 4470 1

AIR PURIFICATION N 188 141 26 145 

AIR QUALITY N 1485 685 136 894 

AIR SAMPLING N 1025 1197 62 557 

AIR SEA ICE INTERACTIONS N 85 141 2 36 

AIR SLEW MISSILES N 0 1 0 5 

AIR START N 11 13 0 6 

AIR TO AIR MISSILES N 148 331 7 2311 

AIR TO AIR REFUELING N 44 63 0 194 

AIR TO SURFACE MISSILES N 98 116 8 2059 

AIR TRAFFIC N 459 610 37 226 

AIR TRAFFIC CONTROL N 2739 3085 193 1439 

AIR TRAFFIC CONTROLLERS (PERSONNEL) N 223 200 8 54 

AIR TRANSPORTATION N 1019 1775 215 881 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**"'***"' SUBJECT TERM  "'**  TYPE STAR IAA NLN OTHER 

AIR WATER INTERACTIONS N 1468 2444 68 912 

AIRBORNE EQUIPMENT N 1835 3787 47 2289 

AIRBORNE INFECTION N 15 8 5 5 

AIRBORNE INTEGRATED RECONNAISSANCE SYSTEM N 8 6 1 7 

AIRBORNE LASERS N 17 98 0 35 

AIRBORNE RADAR APPROACH N 15 14 0 8 

AIRBORNE RANGE AND ORBIT DETERMINATION N 17 10 0 3 

AIRBORNE SURVEILLANCE RADAR N 72 265 6 44 

AIRBORNE/SPACEBORNE COMPUTERS N 1196 3156 41 1035 

AIRCRAFT N 248 70 253 726 

AIRCRAFT ACCIDENT INVESTIGATION N 624 661 24 207 

AIRCRAFT ACCIDENTS N 1200 1121 106 581 

AIRCRAFT ANTENNAS N 352 459 12 770 

AIRCRAFT APPROACH SPACING N 143 201 1 32 

AIRCRAFT BRAKES N 74 142 2 90 

AIRCRAFT CARRIERS N 238 272 19 962 

AIRCRAFT COMMUNICATION N 353 906 28 292 

AIRCRAFT COMPARTMENTS N 441 499 10 280 

AIRCRAFT CONFIGURATIONS N 1069 2053 67 1170 

AIRCRAFT CONSTRUCTION MATERIALS N 766 2256 88 556 

AIRCRAFT CONTROL N 1734 3672 210 1686 

AIRCRAFT DESIGN N 3859 8741 719 3406 1

AIRCRAFT DETECTION N 161 393 1 390 

AIRCRAFT ENGINES N 2487 5222 330 2321 1

AIRCRAFT EQUIPMENT N 1394 1014 120 3202 

AIRCRAFT FUEL SYSTEMS N 170 279 17 250 

AIRCRAFT FUELS N 558 649 53 437 

AIRCRAFT GUIDANCE N 529 684 56 347 

AIRCRAFT HAZARDS N 698 813 30 457 

AIRCRAFT HYDRAULIC SYSTEMS N 98 363 18 110 

AIRCRAFT INDUSTRY N 391 682 122 548 

AIRCRAFT INSTRUMENTS N 680 1948 163 616 

AIRCRAFT LANDING N 1867 1888 42 1629 

AIRCRAFT LAUNCHING DEVICES N 35 58 1 81 

AIRCRAFT LIGHTS N 18 25 1 44 

AIRCRAFT MAINTENANCE N 920 2035 82 1143 

AIRCRAFT MANEUVERS N 687 1396 25 624 

AIRCRAFT MODELS N 772 1020 38 791 

AIRCRAFT NOISE N 1527 2100 97 1133 

AIRCRAFT PARTS N 245 765 41 400 

AIRCRAFT PERFORMANCE N 1807 2679 147 1897 

AIRCRAFT PILOTS N 682 1061 154 367 

AIRCRAFT POWER SUPPLIES N 20 160 1 14 

AIRCRAFT PRODUCTION N 165 837 61 238 

AIRCRAFT PRODUCTION COSTS N 119 322 8 82 

AIRCRAFT RELIABILITY N 597 1822 49 562 

AIRCRAFT RUNUP N 1 2 1 2 

AIRCRAFT SAFETY N 1859 2254 159 1571 

AIRCRAFT SPECIFICATIONS N 97 323 27 141 

AIRCRAFT SPIN N 50 90 5 59 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

AIRCRAFT STABILITY N 991 1745 96 775 

AIRCRAFT STRUCTURES N 2103 4036 353 2370 

AIRCRAFT SURVIVABILITY N 212 337 10 646 

AIRCRAFT TIRES N 195 163 1 214 

AIRCRAFT WAKES N 312 544 11 212 

AIRDROPS N 19 24 1 129 

AIRFIELD SURFACE MOVEMENTS N 122 244 4 57 

AIRFOIL FENCES N 17 11 0 17 

AIRFOIL OSCILLATIONS N 30 214 0 8 

AIRFOIL PROFILES N 675 2153 17 373 

AIRFOILS N 2438 2369 107 1810 

AIRFRAME MATERIALS N 276 494 40 402 

AIRFRAMES N 1391 1025 100 2577 

AIRGLOW N 413 1116 28 310 

AIRLINE OPERATIONS N 896 2679 161 334 

AIRLOCK MODULES N 28 39 0 26 

AIRPORT BEACONS N 31 39 0 10 

AIRPORT LIGHTS N 44 42 6 30 

AIRPORT PLANNING N 419 1435 51 279 

AIRPORT SECURITY N 13 29 1 20 

AIRPORT SURFACE DETECTION EQUIPMENT N 58 37 2 13 

AIRPORT TOWERS N 112 42 3 51 

AIRPORTS N 1675 1078 191 946 

AIRSHIPS N 198 492 97 134 

AIRSPACE N 170 245 21 91 

AIRSPEED N 438 757 19 509 

AIRY FUNCTION N 43 380 8 18 

AITKEN NUCLEI N 27 36 0 4 

AJ-10 ENGINE N 2 1 0 8 

AKERMANITE N 0 2 0 0 

ALABAMA N 157 39 28 173 

ALADIN 2 AIRCRAFT N 2 3 0 3 

ALAIS METEORITE N 1 7 0 1 

ALANINE N 18 79 0 12 

ALARM PROJECT N 0 1 0 0 

ALASKA N 972 303 142 655 

ALBANIA N 10 0 1 8 

ALBEDO N 710 2171 5 272 

ALBERTA N 0 27 1 1 

ALBINISM N 3 5 0 8 

ALBUMINS N 44 64 4 19 

ALCOHOLS N 639 279 108 421 

ALDEHYDES N 151 89 41 82 

ALDOLASE N 3 8 0 1 

ALDOSTERONE N 33 91 3 14 

ALERTNESS N 103 97 11 62 

ALEUTIAN ISLANDS (US) N 13 7 0 19 

ALFALFA N 47 21 0 4 

ALGAE N 478 300 93 339 

ALGEBRA N 1490 1038 832 685 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM * """ .. * *. TYPE STAR IAA NLN OTHER 

ALGERIA N 15 29 6 4 

ALGOL N 360 252 53 109 

ALGOL ENGINE N 5 4 0 7 

ALGORITHMS N 19067 22184 541 8579 5

ALIGNMENT N 743 625 16 632 

ALIPHATIC COMPOUNDS N 196 116 0 39 

ALIPHATIC HYDROCARBONS N 63 42 0 11 

ALKALI HALIDES N 257 128 13 147 

ALKALI METAL COMPOUNDS N 82 60 3 54 

ALKALI METALS N 552 568 29 371 

ALKALI VAPOR LAMPS N 2 2 0 3 

ALKALIES N 210 138 6 188 

ALKALINE BATTERIES N 189 198 10 198 

ALKALINE EARTH COMPOUNDS N 51 51 6 22 

ALKALINE EARTH METALS N 109 84 11 58 

ALKALINE EARTH OXIDES N 40 24 4 23 

ALKALINITY N 72 21 0 51 

ALKALOIDS N 21 6 22 68 

ALKALOSIS N 3 54 2 2 

ALKANES N 232 119 22 107 

ALKENES N 253 128 56 153 

ALKYD RESINS N 16 2 6 7 

ALKYL COMPOUNDS N 257 138 16 128 

ALKYLATES N 16 7 2 0 

ALKYLATION N 44 10 10 39 

ALKYLFERROCENE N 0 0 0 2 

ALKYLIDENE N 2 1 0 0 

ALKYNES N 41 3 10 21 

ALL SKY PHOTOGRAPHY N 80 240 2 32 

ALL-WEATHER AIR NAVIGATION N 200 267 7 278 

ALL-WEATHER LANDING SYSTEMS N 42 102 4 27 

ALLEGHENY PLATEAU (US) N 0 0 0 3 

ALLENDE METEORITE N 13 87 0 2 

ALLERGIC DISEASES N 21 29 31 14 

ALLOCATIONS N 376 127 87 330 

ALLOTROPY N 25 65 2 14 

ALLOWANCES N 10 6 15 12 

ALLOXAN N 1 4 0 1 

ALLOYING N 455 1106 0 62 

ALLOYS N 1656 1113 547 1934 

ALLUVIUM N 80 37 13 57 

ALLYL COMPOUNDS N 20 13 4 9 

ALOHA SYSTEM N 11 186 0 9 

ALOUETTE B SATELLITE N 0 3 0 0 

ALOUETTE HELICOPTERS N 8 16 0 3 

ALOUETTE PROJECT N 1 1 0 14 

ALOUETTE SATELLITES N 33 86 0 68 

ALOUETTE 1 SATELLITE N 32 84 0 128 

ALOUETTE 2 SATELLITE N 33 91 0 37 

ALPHA DECAY N 84 16 1 22 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ALPHA JET AIRCRAFT N 21 68 0 8 

ALPHA PARTICLES N 1025 906 18 399 

ALPHA PLASMA DEVICES N 8 3 0 3 

ALPHABETS N 44 44 25 20 

ALPHANUMERIC CHARACTERS N 164 191 9 121 

ALPHATRONS N 2 2 0 0 

ALPINE METEOROLOGY N 103 70 1 51 

ALPS MOUNTAINS (EUROPE) N 152 97 2 56 

ALTERNATING CURRENT N 675 841 92 501 

ALTERNATING DIRECTION IMPLICIT METHODS N 65 170 0 0 

ALTERNATIONS N 15 10 1 4 

ALTERNATIVES N 171 22 13 115 

ALTIMETERS N 444 398 14 383 

ALTIMETRY N 20 29 0 37 

ALTITUDE N 563 572 33 559 

ALTITUDE ACCLIMATIZATION N 123 593 7 36 

ALTITUDE CONTROL N 95 123 3 108 

ALTITUDE SICKNESS N 71 136 2 23 

ALTITUDE SIMULATION N 175 418 4 425 

ALTITUDE TESTS N 93 108 4 226 

ALTITUDE TOLERANCE N 54 131 6 19 

ALUM N 23 5 0 1 1 

ALUMINATES N 106 80 2 64 

ALUMINIDES N 68 305 0 59 

ALUMINUM N 4167 5223 141 3388 1

ALUMINUM ALLOYS N 4876 13793 152 3548 2

ALUMINUM ANTIMONIDES N 18 50 0 1 

ALUMINUM ARSENIDES N 40 254 0 30 

ALUMINUM BOROHYDRIDES N 2 1 0 7 

ALUMINUM BORON COMPOSITES N 56 330 0 39 

ALUMINUM CARBIDES N 25 66 0 10 

ALUMINUM CHLORIDES N 92 62 3 42 

ALUMINUM COATINGS N 238 496 4 203 

ALUMINUM COMPOUNDS N 443 558 17 384 

ALUMINUM FLUORIDES N 10 20 0 7 

ALUMINUM GALLIUM ARSENIDES N 305 2894 4 142 

ALUMINUM GRAPHITE COMPOSITES N 25 174 0 35 

ALUMINUM HYDRIDES N 14 9 0 83 

ALUMINUM ISOTOPES N 35 58 0 14 

ALUMINUM NITRIDES N 101 258 0 28 

ALUMINUM OXIDES N 1950 3132 36 1205 

ALUMINUM PERCHLORATES N 2 18 0 12 

ALUMINUM SILICATES N 90 106 3 51 

ALUMINUM 26 N 29 185 0 9 

ALUMINUM 27 N 20 20 0 4 

ALVEOLAR AIR N 31 238 0 17 

ALVEOLI N 38 110 1 29 

AMALTHEA N 6 33 1 1 

AMAZON REGION (SOUTH AMERICA) N 105 115 7 20 

AMBERLITE (TRADEMARK) N 1 0 0 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**•  SUBJECT TERM ** ***** TYPE STAR IAA NLN OTHER 

AMBIENCE N 100 29 0 76 

AMBIENT TEMPERATURE N 491 917 4 394 

AMBIGUITY N 102 244 3 46 

AMBIPOLAR DIFFUSION N 68 544 0 14 

AMBULANCES N 14 44 4 24 

AMERICAN INDIANS N 8 0 9 15 

AMERICIUM N 56 5 1 32 

AMERICIUM ISOTOPES N 36 3 0 9 

AMERICIUM 241 N 51 6 0 14 

AMIDASE N 1 1 0 2 

AllUDES N 143 92 10 121 

AMINES N 573 449 59 528 

AMINO ACIDS N 418 1028 118 419 

AMINO RADICAL N 6 8 0 2 

AMINOPHYLLINE N 0 5 0 1 

AMMETERS N 53 22 7 48 

AMMINES N 24 6 0 15 

AMMONIA N 989 2115 32 540 

AMMONIUM BROMIDES N 12 6 0 4 

AMMONIUM CHLORIDES N 42 54 1 31 

AMMONIUM COMPOUNDS N 211 135 6 163 

AMMONIUM NITRATES N 142 87 3 161 

AMMONIUM PERCHLORATE$ N 249 660 3 652 

AMMONIUM PHOSPHATES N 24 44 1 13 

AMMONIUM PICRATES N 2 1 0 5 

AMMONIUM SULFATES N 47 76 0 26 

AMMONOLYSIS N 8 8 0 6 

AMMUNITION N 213 26 11 1141 

AMOBARBITAL N 3 2 0 0 

AMOEBA N 4 8 2 11 

AMDR ASTEROID N 3 49 0 3 

AMORPHOUS MATERIALS N 971 1118 90 442 

AMORPHOUS SEMICONDUCTORS N 284 1145 34 112 

AMORPHOUS SILICON N 296 756 4 88 

AMOUNT N 56 10 1 147 

AMPHETAMINES N 21 33 3 9 

AMPHIBIA N 43 37 17 30 

AMPHIBIOUS AIRCRAFT N 13 40 10 38 

AMPHIBIOUS VEHICLES N 38 73 2 181 

AMPHIBOLES N 29 25 4 5 

AMPHITRITE ASTEROID N 0 8 0 2 

AMPLIDYNES N 1 1 0 1 

AMPLIFICATION N 895 1377 19 736 

AMPLIFIER DESIGN N 227 2251 29 203 

AMPLIFIERS N 847 479 217 1265 

AMPLITUDE DISTRIBUTION ANALYSIS N 281 2252 5 106 

AMPLITUDE MODULATION N 532 2077 23 424 

AMPLITUDES N 1498 3315 10 767 

AMPOULES N 31 30 0 44 

AMPS (SATELLITE PAYLOAD) N 30 29 0 15 
NASA COMBINED FILE POSTING STATISTICS 

910117 

•****** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

AM PTE (SATELLITES) N 29 194 0 11 

AN-2 AIRCRAFT N 4 8 2 2 

AN-22 AIRCRAFT N 0 4 0 3 

AN-24 AIRCRAFT N 4 15 0 3 

ANABAENA N 4 4 0 1 

ANAEROBES N 187 208 14 126 

ANALGESIA N 16 22 7 15 

ANALOG CIRCUITS N 235 741 58 133 

ANALOG COMPUTERS N 651 879 142 576 

ANALOG DATA N 564 650 22 449 

ANALOG SIMULATION N 333 1071 23 292 

ANALOG TO DIGITAL CONVERTERS N 1434 1425 75 1101 

ANALOGIES N 161 351 21 59 

ANALOGS N 232 123 20 202 

ANALYSIS (MATHEMATICS) N 2820 258 609 1797 

ANALYSIS OF VARIANCE N 572 356 42 198 

ANALYTIC FUNCTIONS N 526 1091 126 248 

ANALYTIC GEOMETRY N 153 59 134 78 

ANALYTICAL CHEMISTRY N 281 51 546 172 

ANALYZERS N 296 162 11 326 

ANALYZING N 80 14 109 184 

ANAPHYLAXIS N 4 5 0 1 

ANASTI GMA TI SM N 1 12 0 5 

ANATASE N 11 50 0 8 

ANATOMY N 81 63 203 140 

ANCHORS (FASTENERS) N 72 11 1 96 

ANDES MOUNTAINS (SOUTH AMERICA) N 35 52 3 20 

ANDESITE N 16 31 3 27 

ANDORRA N 1 0 0 1 

ANDROMEDA N 0 3 0 1 

ANDROMEDA CONSTELLATION N 6 29 0 7 

ANDROMEDA GALAXY N 28 640 3 13 

ANECHOIC CHAMBERS N 207 363 1 121 

ANELASTICITY N 69 282 6 27 

ANEMIAS N 26 53 11 25 

ANEMOMETERS N 507 528 22 294 

ANESTHESIA N 32 102 7 43 

ANESTHESIOLOGY N 5 10 5 6 

ANESTHETICS N 16 24 5 33 

ANGELS (RADAR) N 6 23 0 6 

ANGINA PECTORIS N 11 55 3 0 

ANGIOGRAPHY N 43 249 8 23 

ANGIOSPERMS N 3 5 4 0 

ANGLE OF ATTACK N 3073 4471 9 3393 1

ANGLES (GEOMETRY) N 917 951 9 794 

ANGOLA N 3 0 1 1 

ANGULAR ACCELERATION N 235 385 5 104 

ANGULAR CORRELATION N 207 179 10 70 

ANGULAR DISTRIBUTION N 1416 4094 11 449 

ANGULAR MOMENTUM N 1031 3423 67 392 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM •****** TYPE STAR IAA NLN OTHER 

ANGULAR RESOLUTION N 363 1197 5 135 

ANGULAR VELOCITY N 657 4839 8 323 

ANHYDRIDES N 111 79 13 80 

ANIK SATELLITES N 7 31 0 6 

ANIK 1 N 4 44 0 8 

ANIK 2 N 8 49 0 3 

ANIK 3 N 3 37 0 10 

ANI LINE N 83 65 2 43 

ANIMALS N 752 471 489 1255 

ANIMATION N 68 38 0 11 

ANIONS N 576 406 31 226 

ANISOLE N 11 3 0 7 

ANISOTROPIC FLUIDS N 58 180 4 15 

ANISOTROPIC MEDIA N 421 4385 30 149 

ANISOTROPIC PLATES N 93 837 5 30 

ANISOTROPIC SHELLS N 45 519 8 19 

ANISOTROPY N 1866 3441 55 777 

ANNA HURRICANE N 1 0 0 2 

ANNA SATELLITES N 5 6 1 0 

ANNEALING N 2168 4022 35 1098 

ANNIHILATION REACTIONS N 438 362 10 129 

ANNOTATIONS N 54 9 32 64 

ANNUAL VARIATIONS N 2847 7356 31 1427 1

ANNULAR CORE PULSE REACTORS N 5 0 0 0 

ANNULAR DUCTS N 27 45 1 6 

ANNULAR FLOW N 336 1119 5 112 

ANNULAR NOZZLES N 125 142 0 93 

ANNULAR PLATES N 45 523 1 1 1 

ANNULAR SUSPENSION AND POINTING SYSTEM N 10 3 0 2 

ANNULI N 139 358 4 44 

ANODES N 708 787 22 491 

ANODIC COATINGS N 210 194 9 110 

ANODIC STRIPPING N 19 8 0 5 

ANODIZING N 127 218 12 74 

ANOL YTES N 7 8 0 6 

ANOMALIES N 817 1065 18 521 

ANOMALOUS TEMPERATURE ZONES N 60 178 0 15 

ANORTHOSITE N 38 351 1 22 

ANOXIA N 24 79 8 24 

ANTARCTIC OCEAN N 8 9 0 13 

ANTARCTIC REGIONS N 928 1285 92 396 

ANTARES ROCKET VEHICLE N 6 3 0 5 

ANTELOPE MISSILE N 0 0 0 17 

ANTENNA ARRAYS N 1769 4748 62 1523 

ANTENNA COMPONENTS N 261 230 9 200 

ANTENNA COUPLERS N 136 265 5 135 

ANTENNA DESIGN N 1640 5456 89 807 

ANTENNA FEEDS N 570 2033 8 406 

ANTENNA RADIATION PATTERNS N 2708 7772 71 2161 1

ANTENNAS N 1405 534 215 2005 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ANTHRACENE N 95 58 5 50 

ANTHRACITE N 49 29 0 22 

ANTHRAQUINONES N 11 6 0 9 

ANTHROPOLOGY N 32 20 73 34 

ANTHROPOMETRY N 347 171 23 187 

ANTIADRENERGICS N 5 35 0 1 

ANTIAIRCRAFT MISSILES N 44 51 4 451 

ANTIBIOTICS N 51 46 40 75 

ANTIBODIES N 135 118 48 278 

ANTICHOLINERGICS N 19 17 0 9 

ANTICLINES N 12 17 0 7 

ANTICOAGULANTS N 12 21 0 11 

ANTICONVULSANTS N 5 8 1 8 

ANTICYCLONES N 145 377 4 59 

ANTI DIURETICS N 9 43 0 14 

ANTIDOTES N 17 6 1 91 

ANTIEMETICS AND ANTINAUSEANTS N 5 5 0 10 

ANTIFERROELECTRICITY N 22 14 9 9 

ANTI FERROMAGNETISM N 279 219 16 73 

ANTIFOULING N 23 0 0 28 

ANTIFREEZES N 20 16 2 18 

ANTIFRICTION BEARINGS N 238 279 8 222 

ANTIGENS N 79 68 30 180 

ANTIGRAVITY N 37 57 2 23 

ANTIGUA AND BARBUDA N 2 1 5 2 

ANTIHISTAMINICS N 11 22 1 14 

ANTIHYPERTENSIVE AGENTS N 1 23 5 0 

ANTIICING ADDITIVES N 30 24 2 30 

ANTIINFECTIVES AND ANTIBACTERIALS N 12 14 10 12 

ANTIKNOCK ADDITIVES N 38 11 4 21 

ANTIMATTER N 114 258 4 31 

ANTIMISSILE DEFENSE N 242 131 9 4009 

ANTIMISSILE MISSILES N 27 34 5 266 

ANTIMISTING FUELS N 60 18 0 13 

ANTIMONIDES N 26 47 1 21 

ANTIMONY N 216 145 12 156 

ANTIMONY ALLOYS N 75 70 2 30 

ANTIMONY COMPOUNDS N 98 138 8 94 

ANTIMONY FLUORIDES N 6 0 0 3 

ANTIMONY ISOTOPES N 15 2 0 4 

ANTI NEUTRINOS N 66 99 0 22 

ANTI NODES N 2 4 0 1 

ANTI NUCLEONS N 33 21 2 7 

ANTIOXIDANTS N 102 151 9 94 

ANTIPARTICLES N 153 73 2 29 

ANTIPODES N 14 30 0 1 

ANTIPROTONS N 215 169 2 67 

ANTIQUITIES N 1 0 4 4 

ANTIRADAR COATINGS N 23 12 0 234 

ANTIRADIATION DRUGS N 90 175 2 87 
NASA COMBINED FILE POSTING STATISTICS 

910117 

** .. **'** SUBJECT TERM ******• TYPE STAR IAA NLN OTHER 

ANTIRADIATION MISSILES N 3 15 0 129 

ANTIREFLECTION COATINGS N 307 618 6 254 

ANTISEPTICS N 51 13 21 36 

ANTISERUMS N 9 7 11 7 

ANTISHIP MISSILES N 7 21 0 109 

ANTISHIP WARFARE N 4 5 0 17 

ANTISKID DEVICES N 28 23 1 24 

ANTISUBMARINE WARFARE N 80 74 7 1176 

ANTISUBMARINE WARFARE AIRCRAFT N 30 50 2 518 

ANTI SYMMETRY N 19 67 0 10 

ANTITANK MISSILES N 50 47 4 383 

ANTONOV AIRCRAFT N 7 16 1 6 

ANVIL CLOUDS N 15 61 0 7 

ANVILS N 26 52 0 17 

ANXIETY N 53 90 10 30 

AORTA N 46 257 2 27 

AOSO N 1 0 0 2 

APACHE ROCKET VEHICLE N 7 4 0 9 

APERIODIC FUNCTIONS N 12 61 2 3 

APERTURES N 872 2098 14 557 

APES N 1 2 0 1 

APEXES N 108 89 0 29 

APHELION$ N 7 67 0 1 

APL (PROGRAMMING LANGUAGE) N 15 8 5 0 

APOGEE BOOST MOTORS N 75 111 0 20 

APOGEES N 119 149 0 111 

APOLLO APPLICATIONS PROGRAM N 125 66 2 487 

APOLLO ASTEROIDS N 3 78 0 4 

APOLLO EXTENSION SYSTEM N 3 1 0 49 

APOLLO FLIGHTS N 161 629 23 341 

APOLLO LUNAR EXPERIMENT MODULE N 10 14 2 22 

APOLLO LUNAR SURFACE EXPERIMENTS PACKAGE N 106 111 4 138 

APOLLO PROJECT N 681 506 157 4969 

APOLLO SHORT STACK N 1 1 0 0 

APOLLO SOYUZ TEST PROJECT N 297 188 22 92 

APOLLO SPACECRAFT N 487 327 24 2163 

APOLLO TELESCOPE MOUNT N 119 169 5 196 

APOLLO 10 FLIGHT N 27 5 5 103 

APOLLO 11 FLIGHT N 162 566 21 124 

APOLLO 12 FLIGHT N 195 508 9 111 

APOLLO 13 FLIGHT N 42 22 9 61 

APOLLO 14 FLIGHT N 113 321 4 99 

APOLLO 15 FLIGHT N 196 409 9 135 

APOLLO 16 FLIGHT N 200 454 8 113 

APOLLO 17 FLIGHT N 173 448 5 76 

APOLLO 5 FLIGHT N 8 0 0 42 

APOLLO 6 FLIGHT N 11 6 0 32 

APOLLO 7 FLIGHT N 17 6 1 71 

APOLLO 8 FLIGHT N 32 26 2 98 

APOLLO 9 FLIGHT N 59 23 3 104 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

APPALACHIAN MOUNTAINS (NORTH AMERICA) N 48 29 9 45 

APPEARANCE N 8 5 4 6 

APPENDAGES N 43 88 1 12 

APPENDIX (ANATOMY) N 0 1 0 0 

APPLICATION SPECIFIC INTEGRATED CIRCUITS N 44 27 0 7 

APPLICATIONS EXPLORER SATELLITES N 1 1 5 0 5 

APPLICATIONS OF MATHEMATICS N 1270 745 743 843 

APPLICATIONS PROGRAMS (COMPUTERS) N 1118 225 52 399 

APPROACH N 388 99 10 385 

APPROACH AND LANDING TESTS (STS) N 24 29 1 14 

APPROACH CONTROL N 616 585 9 240 

APPROACH INDICATORS N 144 72 0 82 

APPROPRIATIONS N 471 7 484 230 

APPROXIMATION N 6441 9818 431 2077 1

APSIDES N 8 156 0 8 

APTITUDE N 133 30 30 75 

AQUARIO METEOROIDS N 8 33 0 3 

AQUATIC PLANTS N 63 26 12 47 

AQUEOUS SOLUTIONS N 738 781 83 329 

AQUICULTURE N 77 46 8 67 

AQUIFERS N 402 93 25 294 

ARABIAN SEA N 38 62 1 21 

ARAB SAT N 15 17 0 16 

ARAGONITE N 5 11 0 4 

ARC CHAMBERS N 35 73 1 29 

ARC CLOUDS N 3 5 0 1 

ARC DISCHARGES N 306 784 15 140 

ARC GENERATORS N 46 57 1 36 

ARC HEATING N 185 295 4 182 

ARC JET ENGINES N 130 327 0 77 

ARC LAMPS N 84 92 4 105 

ARC MELTING N 111 190 4 77 

ARC SPRAYING N 48 42 1 33 

ARC WELDING N 414 342 43 379 

ARCAS ROCKET VEHICLES N 24 19 0 17 

ARCHAEBACTERIA N 11 47 0 9 

ARCHAEOLOGY N 64 40 32 66 

ARCHES N 62 196 19 47 

ARCHIPELAGOES N 7 19 0 4 

ARCHITECTURE N 568 285 439 586 

ARCHITECTURE (COMPUTERS) N 3810 3200 263 1781 

ARCOMSAT N 1 2 0 0 

ARCON ROCKET VEHICLE N 0 0 0 2 

ARCS N 24 117 3 27 

ARCTIC OCEAN N 233 166 10 233 

ARCTIC REGIONS N 913 768 60 719 

AREA N 91 89 10 93 

AREA NAVIGATION N 95 172 2 35 

AREND-ROLAND COMET N 4 28 0 2 

ARGENTINA N 103 111 6 46 
NASA COMBINED FILE POSTING STATISTICS 

910117 

•"'*•*** SUBJECT TERM *•*****' TYPE STAR IAA NLN OTHER 

ARGENTINE SPACE PROGRAM N 3 7 0 0 

ARGO ROCKET VEHICLES N 2 0 0 1 

ARGON N 1873 2967 36 854 

ARGON ISOTOPES N 81 462 1 32 

ARGON LASERS N 268 1086 5 130 

ARGON PLASMA N 392 1741 7 88 

ARGON-OXYGEN ATMOSPHERES N 9 25 0 1 

ARGOS SYSTEM N 176 78 0 6 

ARGOSY MK-1 AIRCRAFT N 0 0 0 2 

ARGUS PROJECT N 10 6 1 7 

ARIANE LAUNCH VEHICLE N 386 657 5 379 

ARID LANDS N 254 353 40 148 

ARIEL N 5 47 0 4 

ARIEL SATELLITES N 40 115 0 11 

ARIEL 1 SATELLITE N 13 16 1 2 

ARIEL 2 SATELLITE N 4 3 0 1 

ARIEL 3 SATELLITE N 22 48 0 2 

ARIEL 4 SATELLITE N 10 25 0 0 

ARIEL 5 SATELLITE N 16 154 0 9 

ARIES CONSTELLATION N 2 8 0 4 

ARIES SOUNDING ROCKET N 2 15 0 2 

ARIETID METEOROIDS N 1 11 0 2 

ARITHMETIC N 219 263 110 76 

ARITHMETIC AND LOGIC UNITS N 126 166 22 76 

ARIZONA N 521 168 64 312 

ARIZONA REGIONAL ECOLOGICAL TEST SITE N 1 0 0 0 

ARKANSAS N 70 22 14 81 

ARM (ANATOMY) N 107 276 2 47 

ARMATURES N 118 170 8 202 

ARMED FORCES N 126 46 89 155 

ARMED FORCES (FOREIGN) N 155 103 60 267 

ARMED FORCES (UNITED STATES) N 1386 464 200 3747 

ARMOR N 210 43 7 560 

ARMY-NAVY INSTRUMENTATION PROGRAM N 0 1 0 10 

AROMATIC COMPOUNDS N 306 584 68 233 

AROOS METEORITE N 0 2 0 0 

AROUSAL N 28 51 1 10 

ARPA COMPUTER NETWORK N 37 6 2 20 

ARRAYS N 1341 1066 60 1495 

ARRESTERS N 14 10 3 18 

ARRESTING GEAR N 68 31 1 164 

ARRHYTHMIA N 48 239 18 20 

ARRIVALS N 71 38 0 43 

ARROW WINGS N 101 65 0 77 

ARROYOS N 3 1 0 4 

ARSENATES N 18 17 1 14 

ARSENIC N 227 172 13 153 

ARSENIC ALLOYS N 11 16 0 17 

ARSENIC COMPOUNDS N 149 173 7 96 

ARSENIC ISOTOPES N 5 0 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ARSENIDES N 85 93 1 88 

ARTEMIA N 6 9 0 12 

ARTERIES N 166 828 21 88 

ARTERIOSCLEROSIS N 62 239 15 25 

ARTHRITIS N 14 10 6 6 

ARTHROPODS N 19 14 13 49 

ARTICULATION (SPEECH) N 35 28 15 22 

ARTIFACTS N 23 16 14 25 

ARTIFICIAL CARDIAC PACEMAKER N 5 3 2 4 

ARTIFICIAL CLOUDS N 137 426 0 76 

ARTIFICIAL EARS N 5 3 0 2 

ARTIFICIAL GRAVITY N 116 211 1 103 

ARTIFICIAL HARBORS N 5 0 1 5 

ARTIFICIAL HEART VALVES N 37 18 9 22 

ARTIFICIAL INTELLIGENCE N 2757 1446 399 1469 

ARTIFICIAL RADIATION BELTS N 16 13 1 23 

ARTIFICIAL SATELLITES N 1873 1184 525 2519 

ARTILLERY N 94 39 9 394 

ARTILLERY FIRE N 31 12 0 83 

ARTS N 10 9 95 11 

ASBESTOS N 128 104 26 197 

ASCENT N 60 77 1 75 

ASCENT PROPULSION SYSTEMS N 43 31 0 79 

ASCENT TRAJECTORIES N 172 178 1 371 

ASCORBIC ACID N 32 50 4 19 

ASCORBIC ACID METABOLISM N 8 14 1 1 

ASHES N 248 276 19 159 

ASIA N 275 251 95 237 

ASP ROCKET VEHICLE N 0 0 1 0 

ASPARTATES N 3 7 0 2 

ASPARTIC ACID N 8 35 0 2 

ASPECT RATIO N 627 1494 1 357 

ASPERGILLUS N 6 4 2 4 

ASPHALT N 301 49 29 211 

ASPHALTENES N 17 2 1 22 

ASPHERICITY N 42 184 6 27 

ASPHYXIA N 8 40 5 8 

ASROC ENGINE N 3 0 0 11 

ASSATEAGUE ISLAND (MD-VA) N 7 1 2 1 

ASSAYING N 100 25 12 206 

ASSEMBLER ROUTINES N 143 33 31 105 

ASSEMBLIES N 191 141 12 199 

ASSEMBLING N 331 264 37 423 

ASSEMBLY N 25 94 2 32 

ASSEMBLY LANGUAGE N 220 53 88 158 

ASSESS PROGRAM N 13 19 0 2 

ASSESSMENTS N 573 51 37 313 

ASSET GLIDERS N 0 3 0 24 

ASSET PROJECT N 0 1 0 37 

ASSIMILATION N 53 25 2 39 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ASSOCIATION REACTIONS N 14 103 5 8 

ASSOCIATIVE PROCESSING (COMPUTERS) N 84 190 0 51 

ASSUMPTIONS N 128 10 2 26 

ASSURANCE N 121 56 6 63 

ASTATINE N 6 1 2 3 

ASTATINE ISOTOPES N 8 0 0 1 

ASTEC SOLAR TURBOELECTRIC GENERATOR N 0 1 0 2 

ASTEROID BELTS N 21 173 0 25 

ASTEROID CAPTURE N 5 11 0 4 

ASTEROID MISSIONS N 25 80 0 12 

ASTEROIDS N 436 2246 52 406 

ASTHENOPIA N 1 2 0 0 

ASTHMA N 13 21 1 6 

ASTIGMATISM N 79 282 4 37 

ASTRIONICS N 30 340 111 87 

ASTRO MISSIONS (STS) N 9 13 1 4 

ASTRO VEHICLE N 5 7 0 1 

ASTROBEE ROCKET VEHICLES N 6 10 0 12 

ASTROBEE 1500 ROCKET VEHICLE N 3 0 0 3 

ASTRODYNAMICS N 109 1380 214 69 

ASTROGRAPHY N 36 183 62 21 

ASTROGUIDE NAVIGATION SYSTEM N 9 15 0 8 

ASTROLABES N 14 79 0 2 

ASTROLOY (TRADEMARK) N 15 79 1 7 

ASTROMETRY N 366 3387 51 143 

ASTRON THERMONUCLEAR REACTOR N 25 14 1 13 

ASTRONAUT LOCOMOTION N 60 80 0 42 

ASTRONAUT MANEUVERING EQUIPMENT N 30 44 2 37 

ASTRONAUT PERFORMANCE N 315 717 31 248 

ASTRONAUT TRAINING N 167 291 16 123 

ASTRONAUTICS N 107 225 957 227 

ASTRONAUTS N 421 256 113 417 

ASTRONAVIGATION N 29 90 27 30 

ASTRONOMICAL CATALOGS N 450 4693 495 155 

ASTRONOMICAL COORDINATES N 308 1741 39 158 

ASTRONOMICAL MAPS N 141 3562 70 69 

ASTRONOMICAL MODELS N 1142 16872 43 236 

ASTRONOMICAL NETHERLANDS SATELLITE N 43 158 1 9 

ASTRONOMICAL OBSERVATORIES N 737 1826 165 898 

ASTRONOMICAL PHOTOGRAPHY N 638 4380 86 603 

ASTRONOMICAL PHOTOMETRY N 485 7533 58 288 

ASTRONOMICAL SATELLITES N 38 87 2 46 

ASTRONOMICAL SPECTROSCOPY N 666 8105 62 464 

ASTRONOMY N 1051 937 1411 1650 

ASTROPHYSICS N 1645 4147 829 1437 

ASTROPLANE N 1 4 0 0 

ASYMMETRY N 619 1207 8 279 

ASYMPTOTES N 565 689 54 132 

ASYMPTOTIC GIANT BRANCH STARS N 19 413 0 2 

ASYMPTOTIC METHODS N 1490 8715 97 437 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ASYMPTOTIC PROPERTIES N 144 705 1 25 

ASYMPTOTIC SERIES N 874 699 26 237 

ASYNCHRONOUS MOTORS N 37 50 4 24 

ATAXIA N 18 15 0 3 

AT AXITE N 2 11 0 0 

ATCHAFALAYA RIVER BASIN (LA) N 1 3 0 7 

ATELECTASIS N 4 13 1 2 

ATHENA ROCKET VEHICLE N 15 3 0 187 

ATHLETES N 50 311 28 18 

ATLANTA (GA) N 8 20 2 3 

ATLANTIC OCEAN N 1450 1460 154 926 

ATLANTIS (ORBITER) N 3 2 0 24 

ATLAS ABLE 5 LAUNCH VEHICLE N 0 1 0 1 

ATLAS AGENA B LAUNCH VEHICLE N 0 0 0 9 

ATLAS AGENA LAUNCH VEHICLES N 22 3 1 56 

ATLAS CENTAUR LAUNCH VEHICLE N 115 57 3 228 

ATLAS D ICBM N 0 0 0 25 

ATLAS E ICBM N 0 0 0 46 

ATLAS F ICBM N 1 1 0 45 

ATLAS ICBM N 2 5 2 121 

ATLAS LAUNCH VEHICLES N 35 39 4 312 

ATLAS SLV-3 LAUNCH VEHICLE N 4 3 0 35 

ATLIT PROJECT N 6 5 0 3 

ATMOSPHERES N 123 35 49 241 

ATMOSPHERIC & OCEANOGRAPHIC INFORM SYS N 9 7 0 6 

ATMOSPHERIC ATTENUATION N 1495 4943 28 690 

ATMOSPHERIC BOUNDARY LAYER N 958 3857 35 383 

ATMOSPHERIC CHEMISTRY N 1609 4213 144 1188 

ATMOSPHERIC CIRCULATION N 4285 9026 162 1779 1

ATMOSPHERIC CLOUD PHYSICS LAB (SPACELAB) N 11 11 0 19 

ATMOSPHERIC COMPOSITION N 3224 8061 140 2267 1

ATMOSPHERIC CONDUCTIVITY N 118 225 6 58 

ATMOSPHERIC CORRECTION N 85 353 0 28 

ATMOSPHERIC DENSITY N 939 1941 8 385 

ATMOSPHERIC DIFFUSION N 837 1303 40 374 

ATMOSPHERIC EFFECTS N 740 1687 53 395 

ATMOSPHERIC ELECTRICITY N 509 1842 64 249 

ATMOSPHERIC ENERGY SOURCES N 13 150 0 9 

ATMOSPHERIC ENTRY N 717 1280 52 1451 

ATMOSPHERIC ENTRY SIMULATION N 105 162 2 95 

ATMOSPHERIC GENERAL CIRCULATION EXPERIMENT N 14 9 1 8 

ATMOSPHERIC GENERAL CIRCULATION MODELS N 61 193 0 13 

ATMOSPHERIC HEAT BUDGET N 310 847 12 94 

ATMOSPHERIC HEATING N 293 1879 4 113 

ATMOSPHERIC IONIZATION N 268 1905 9 145 

ATMOSPHERIC LASERS N 26 110 2 57 

ATMOSPHERIC MODELS N 5737 17269 114 2469 2

ATMOSPHERIC MOISTURE N 1178 3551 23 453 

ATMOSPHERIC OPTICS N 294 4422 68 180 

ATMOSPHERIC PHYSICS N 1296 2589 180 1255 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*•***** SUBJECT TERM **+  TYPE STAR IAA NLN OTHER 

ATMOSPHERIC PRESSURE N 2281 3387 34 1236 

ATMOSPHERIC RADIATION N 655 2294 92 443 

ATMOSPHERIC REFRACTION N 460 1378 11 303 

ATMOSPHERIC SCATTERING N 628 2635 16 378 

ATMOSPHERIC SOUNDING N 719 1858 28 480 

ATMOSPHERIC STRATIFICATION N 351 2527 8 110 

ATMOSPHERIC TEMPERATURE N 3606 7747 40 1761 1

ATMOSPHERIC TIOES N 179 778 5 57 

ATMOSPHERIC TURBULENCE N 2108 5954 93 926 

ATMOSPHERIC WINDOWS N 73 426 0 41 

ATMOSPHERICS N 354 636 34 268 

ATOLLS N 6 3 5 11 

ATOM CONCENTRATION N 106 732 4 34 

ATOMIC BEAMS N 300 456 15 115 

ATOMIC CLOCKS N 282 446 5 140 

ATOMIC COLLISIONS N 780 1788 120 388 

ATOMIC ENERGY LEVELS N 1281 2218 62 427 

ATOMIC EXCITATIONS N 945 2447 44 308 

ATOMIC INTERACTIONS N 24 232 3 16 

ATOMIC MOBILITIES N 27 113 4 14 

ATOMIC PHYSICS N 263 331 185 187 

ATOMIC RECOMBINATION N 93 269 3 35 

ATOMIC SPECTRA N 430 1155 168 164 

ATOMIC STRUCTURE N 1406 1488 294 577 

ATOMIC THEORY N 102 128 80 40 

ATOMIC WEIGHTS N 58 58 18 28 

ATOMIZERS N 86 183 2 33 

ATOMIZING N 309 341 15 197 

ATOMS N 590 106 199 398 

ATROPHY N 86 107 2 71 

ATROPINE N 29 71 0 64 

ATS N 285 315 10 148 

ATS 1 N 91 100 0 34 

ATS 2 N 8 1 0 4 

ATS 3 N 85 103 0 26 

ATS 4 N 1 1 0 15 

ATS 5 N 104 97 1 38 

ATS 6 N 221 521 7 105 

ATS 7 N 6 6 2 7 

ATS 8 N 0 0 0 2 

ATTACHMENT N 22 52 0 30 

ATTACK N 4 12 0 10 

ATTACK AIRCRAFT N 249 402 21 1152 

ATTACKING (ASSAULTING) N 45 33 4 288 

ATTENTION N 240 199 25 115 

ATTENUATION N 610 146 17 471 

ATTENUATION COEFFICIENTS N 237 857 3 105 

ATTENUATORS N 117 186 6 146 

ATTITUDE (INCLINATION) N 555 586 14 386 

ATTITUDE CONTROL N 1395 1492 55 1720 
NASA COMBINED FILE POSTING STATISTICS 

910117 

** ***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ATTITUDE GYROS N 102 191 2 66 

ATTITUDE INDICATORS N 226 312 3 165 

ATTITUDE STABILITY N 245 534 4 99 

ATTRACTION N 28 55 5 3 

AUDIO DATA N 1 3 1 0 

AUDIO EQUIPMENT N 109 30 51 168 

AUDIO FREQUENCIES N 303 193 14 259 

AUDIO SIGNALS N 18 13 0 3 

AUDIOLOGY N 56 65 13 28 

AUDIOMETRY N 164 168 25 64 

AUDITORY DEFECTS N 180 168 42 110 

AUDITORY FATIGUE N 36 19 2 11 

AUDITORY PERCEPTION N 629 494 48 259 

AUDITORY SENSATION AREAS N 28 62 4 10 

AUDITORY SIGNALS N 213 165 10 129 

AUDITORY STIMULI N 246 536 8 104 

AUDITORY TASKS N 62 109 0 17 

AUFEIS (ICE) N 6 1 0 1 

AUGER EFFECT N 139 227 17 64 

AUGER SPECTROSCOPY N 666 839 25 216 

AUGMENTATION N 365 132 6 420 

AURIGA CONSTELLATION N 25 32 0 5 

AURORA 7 N 0 0 1 0 

AURORAL ABSORPTION N 62 238 1 28 

AURORAL ARCS N 152 710 3 39 

AURORAL ECHOES N 18 110 0 15 

AURORAL ELECTROJETS N 146 870 2 27 

AURORAL IONIZATION N 122 270 3 52 

AURORAL IRRADIATION N 36 102 1 21 

AURORAL SPECTROSCOPY N 88 444 0 24 

AURORAL TEMPERATURE N 12 36 0 7 

AURORAL ZONES N 456 2934 20 157 

AURORAS N 1350 2004 65 620 

AUSFDRMING N 22 18 2 29 

AUSTENITE N 383 557 10 114 

AUSTENITIC STAINLESS STEELS N 762 1601 24 298 

AUSTRALIA N 738 794 98 804 

AUSTRALIAN SPACE PROGRAM N 4 31 0 4 

AUSTRALITES N 0 31 1 3 

AUSTRIA N 86 69 22 53 

AUSTRIAN SPACE PROGRAM N 0 0 0 0 

AUTOCATALYSIS N 15 60 0 14 

AUTOCLAVES N 53 104 1 59 

AUTOCLAVING N 59 84 2 39 

AUTOCODERS N 26 3 1 11 

AUTOCORRELATION N 821 2968 11 278 

AUTODYNES N 5 61 0 12 

AUTOGYROS N 6 14 9 12 

AUTOIONIZATION N 86 449 2 26 

AUTOKINESIS N 5 30 0 7 
NASA COMBINED FILE POSTING STATISTICS 

910117 

•*•**** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

AUTOMATA THEORY N 937 666 267 572 

AUTOMATED EN ROUTE ATC N 17 46 0 4 

AUTOMATED GUIDEWAY TRANSIT VEHICLES N 35 57 3 18 

AUTOMATED MIXED TRAFFIC VEHICLES N 5 20 0 1 

AUTOMATED PILOT ADVISORY SYSTEM N 5 28 0 0 

AUTOMATED RADAR TERMINAL SYSTEM N 11 15 0 4 

AUTOMATED TRANSIT VEHICLES N 6 7 0 1 

AUTOMATIC CONTROL N 3912 5232 1049 3518 1

AUTOMATIC CONTROL VALVES N 76 60 5 107 

AUTOMATIC FLIGHT CONTROL N 474 1169 50 354 

AUTOMATIC FREQUENCY CONTROL N 79 342 5 73 

AUTOMATIC GAIN CONTROL N 135 348 6 144 

AUTOMATIC LANDING CONTROL N 154 305 4 94 

AUTOMATIC PICTURE TRANSMISSION N 63 93 3 138 

AUTOMATIC PI LOTS N 417 817 31 735 

AUTOMATIC TEST EQUIPMENT N 380 2417 58 205 

AUTOMATIC TRAFFIC ADVISORY AND RESOLUTION N 10 19 0 7 

AUTOMATIC TYPEWRITERS N 17 4 3 14 

AUTOMATIC WEATHER STATIONS N 102 78 3 22 

AUTOMATION N 740 1884 251 814 

AUTOMOBILE ACCIDENTS N 183 29 35 106 

AUTOMOBILE ENGINES N 664 432 104 379 

AUTOMOBILE FUELS N 360 174 39 255 

AUTOMOBILES N 1254 533 433 1044 

AUTOMORPHISMS N 88 32 33 55 

AUTONOMIC NERVOUS SYSTEM N 96 216 22 115 

AUTONOMOUS NAVIGATION N 162 221 0 44 

AUTONOMOUS SPACECRAFT CLOCKS N 16 12 0 0 

AUTONOMY N 242 391 5 112 

AUTOPSIES N 31 72 5 31 

AUTORADIOGRAPHY N 86 98 14 72 

AUTOREGRESSIVE PROCESSES N 250 441 2 28 

AUTO ROTATION N 92 86 4 55 

AUTOTROPHS N 20 36 0 12 

AUTUMN N 14 49 0 10 

AUXILIARY POWER SOURCES N 401 393 39 431 

AUXILIARY PROPULSION N 133 144 4 192 

AVAILABILITY N 202 318 34 250 

AVALANCHE DIODES N 479 1853 33 844 

AVALANCHES N 90 55 9 61 

AVERAGE N 219 479 9 38 

AVIAN 2/180 AUTOGIRO N 0 0 0 1 

AVIATION METEOROLOGY N 158 356 0 45 

AVIATION PSYCHOLOGY N 17 143 2 7 

AVIONICS N 2192 4116 280 3248 

AVOIDANCE N 53 56 1 62 

AVRO 707 AIRCRAFT N 6 1 0 2 

AWACS AIRCRAFT N 12 25 0 98 

AWARDS N 14 0 15 91 

AXES (REFERENCE LINES) N 90 140 3 53 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

AXES OF ROTATION N 319 965 2 161 

AXIAL COMPRESSION LOADS N 300 1411 3 114 

AXIAL FLOW N 664 1033 17 322 

AXIAL FLOW PUMPS N 53 57 10 56 

AXIAL FLOW TURBINES N 375 662 13 177 

AXIAL LOADS N 572 2214 15 260 

AXIAL MODES N 37 52 0 11 

AXIAL STRAIN N 343 951 9 128 

AXIAL STRESS N 329 1283 6 153 

AXIOMS N 176 67 47 41 

AXISYMMETRIC BODIES N 521 1497 5 219 

AXISYMMETRIC FLOW N 911 3130 8 345 

AXONS N 25 74 4 9 

AZEOTROPES N 13 7 2 10 

AZIDES (INORGANIC) N 50 24 4 84 

AZIOES (ORGANIC) N 59 24 5 107 

AZIMUTH N 684 1291 14 600 

AZINES N 43 26 2 32 

AZO COMPOUNDS N 60 38 2 44 

AZOLES N 67 42 2 74 

AZOTOBACTER N 0 11 1 1 

AZUL ENE N 15 6 0 7 

AZUR SATELLITE N 55 67 0 2 

B STARS N 215 3288 7 78 

B-1 AIRCRAFT N 79 241 0 659 

B-26 AIRCRAFT N 2 3 0 8 

B-47 AIRCRAFT N 0 7 0 20 

B-50 AIRCRAFT N 0 0 0 1 

B-52 AIRCRAFT N 72 95 4 329 

B-57 AIRCRAFT N 41 18 0 40 

B-58 AIRCRAFT N 13 12 1 36 

B-66 AIRCRAFT N 2 1 0 1 1 

B-70 AIRCRAFT N 54 28 1 70 

BABBITT METAL N 3 5 0 0 

BABOONS N 26 39 6 27 

BAC AIRCRAFT N 14 25 0 17 

BAC 111 AIRCRAFT N 9 14 0 10 

BACILLUS N 68 81 2 45 

BACK INJURIES N 68 71 8 4 

BACKFIRE N 20 36 0 9 

BACKFIRE ANTENNAS N 33 59 0 2 

BACKGROUND NOISE N 445 1683 17 258 

BACKGROUND RADIATION N 640 2666 9 435 

BACK LOBES N 8 21 0 8 

BACKSCATTERING N 2248 4141 31 1184 

BACKUPS N 47 49 0 81 

BACKWARD DIFFERENCING N 27 13 0 2 

BACKWARD FACING STEPS N 60 291 0 8 

BACKWARD WAVE TUBES N 21 150 0 74 

BACKWARD WAVES N 28 169 2 36 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ***"'*"'* TYPE STAR IAA NLN OTHER 

BACKWASH N 23 9 0 9 

BACTERIA N 631 601 172 740 

BACTERIAL DISEASES N 11 15 0 3 

BACTERICIDES N 63 43 5 40 

BACTERIOLOGY N 90 214 98 115 

BACTERIOPHAGES N 39 48 13 32 

BADLANDS N 3 2 0 0 

BAFFLES N 223 216 1 229 

BAGGAGE N 6 87 1 7 

BAGS N 28 14 2 56 

BAHAMAS N 2 5 5 5 

BAHRAIN N 0 2 4 0 

BAILOUT N 23 31 2 39 

BAINITE N 38 41 3 15 

BAINITIC STEEL N 25 46 0 3 

BAKELITE (TRADEMARK) N 0 9 0 3 

BAKER-NUNN CAMERA N 31 37 0 9 

BAKING N 31 31 2 26 

BALANCE N 217 122 12 143 

BALANCING N 138 249 15 64 

BALL BEARINGS N 624 625 18 392 

BALL LIGHTNING N 4 49 3 9 

BALLAST N 4 9 0 0 

BALLAST (MASS) N 36 33 0 29 

BALLASTS (IMPEDANCES) N 19 11 0 18 

BALLISTIC CAMERAS N 35 44 1 78 

BALLISTIC MISSILE DECOYS N 5 6 0 69 

BALLISTIC MISSILE EARLY WARNING SYSTEM N 1 11 0 20 

BALLISTIC MISSILE SUBMARINES N 7 13 1 212 

BALLISTIC MISSILES N 136 289 60 577 

BALLISTIC RANGES N 90 159 7 107 

BALLISTIC TRAJECTORIES N 183 347 8 290 

BALLISTIC VEHICLES N 13 61 1 20 

BALLISTICS N 561 418 44 1534 

BALLISTOCARDIOGRAPHY N 16 75 9 4 

BALLOON FLIGHT N 315 730 26 242 

BALLOON SOUNDING N 672 1955 10 236 

BALLOON-BORNE INSTRUMENTS N 650 1389 21 359 

BALLOONING MODES N 39 11 0 5 

BALLOONS N 293 167 84 354 

BALLS N 63 42 1 79 

BALLUTES N 24 17 0 32 

BALMER SERIES N 142 1613 2 29 

BALSA N 10 10 0 8 

BALTIC SEA N 73 72 2 41 

BALTIC SHIELD (EUROPE) N 10 8 0 0 

BANACH SPACE N 610 639 101 251 

BAND RATIOING N 10 24 0 3 

BAND STRUCTURE OF SOLIDS N 1086 1488 98 333 

BANDPASS FILTERS N 853 2330 34 642 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

BANDS N 16 17 1 24 

BANDSTOP FILTERS N 9 43 0 6 

BANDWIDTH N 1440 4386 19 1008 

BANGLADESH N 23 40 1 6 

BARANY CHAIR N 13 15 0 0 

BARBADOS N 19 14 1 7 

BARENTS SEA N 11 25 1 26 

BARITE N 12 2 4 1 

BARIUM N 378 501 9 233 

BARIUM ALLOYS N 6 15 0 1 

BARIUM COMPOUNDS N 251 506 1 154 

BARIUM FERRATES N 4 0 0 5 

BARIUM FLUORIDES N 45 80 0 11 

BARIUM ION CLOUDS N 94 174 1 26 

BARIUM I SOT OPES N 30 21 0 7 

BARIUM OXIDES N 418 1494 0 51 

BARIUM SULFIDES N 11 4 0 1 

BARIUM TITANATES N 116 306 1 92 

BARIUM ZIRCONATES N 4 4 0 3 

BARKHAUSEN EFFECT N 16 33 1 17 

BARLEY N 67 35 1 11 

BAROCLINIC INSTABILITY N 112 388 0 25 

BAROCLINIC WAVES N 194 610 4 62 

BAROCLINITY N 159 401 4 68 

BAROMETERS N 83 78 4 47 

BARORECEPTORS N 15 89 0 7 

BAROTRAUMA N 23 59 0 1 1 

BAROTROPIC FLOW N 201 728 2 62 

BAROTROPISM N 57 185 1 26 

BARRAGES N 0 1 0 2 

BARRED GALAXIES N 12 309 0 0 

BARRELS N 17 7 0 10 

BARRELS (CONTAINERS) N 31 2 0 16 

BARREN LAND N 35 19 2 6 

BARRIER LAYERS N 239 762 4 176 

BARRIERS N 114 168 2 82 

BARRIERS (LANDFORMS) N 22 19 2 9 

BARRITT DIODES N 4 15 2 0 

BARS N 187 627 20 87 

BARS (LANDFORMS) N 13 1 1 5 

BARYON RESONANCE N 150 5 5 27 

BARYONS N 318 556 10 96 

BASALT N 446 1713 21 310 

BASE FLOW N 108 253 5 124 

BASE HEATING N 36 69 0 65 

BASE PRESSURE N 132 344 2 151 

BASEMENTS N 7 4 2 11 

BASES N 19 47 1 24 

BASES (CHEMICAL) N 63 36 20 36 

BASIC (PROGRAMMING LANGUAGE) N 253 76 261 42 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

BASINS (CONTAINERS) N 20 6 1 20 

BASKETS N 2 4 0 2 

BASTNASITE N 3 1 1 0 

BATCH PROCESSING N 277 126 21 206 

BATHING N 12 15 1 13 

BATHOLITHS N 17 10 8 13 

BATHS N 90 20 5 64 

BATHYMETERS N 292 167 10 198 

BATHYTHERMOGRAPHS N 130 47 2 125 

BATS N 20 13 0 12 

BATTERY CHARGERS N 221 107 10 202 

BAUSCHINGER EFFECT N 36 175 1 14 

BAUXITE N 19 9 6 16 

BAY ICE N 21 9 0 8 

BAYARD-ALPERT IONIZATION GAGES N 10 10 0 0 

BAYES THEOREM N 1067 852 70 335 

BAYOUS N 10 0 1 5 

BAYS N 4 9 1 12 

BAYS (STRUCTURAL UNITS) N 87 42 0 209 

BAYS (TOPOGRAPHIC FEATURES) N 211 99 6 152 

BBGKY HIERARCHY N 15 110 0 5 

BCH CODES N 27 51 2 8 

BCS THEORY N 33 54 0 11 

BE-3 ENGINE N 1 1 0 4 

BEACHES N 164 32 25 165 

BEACON COLLISION AVOIDANCE SYSTEM N 44 14 0 19 

BEACON EXPLORER A N 16 9 0 0 

BEACON SATELLITES N 26 154 5 20 

BEACONS N 102 75 2 142 

BEADS N 89 50 1 62 

BEAGLE AIRCRAFT N 2 1 0 1 

BEAM CURRENTS N 446 465 3 175 

BEAM INJECTION N 441 439 0 139 

BEAM INTERACTIONS N 172 516 3 46 

BEAM LEADS N 54 27 1 92 

BEAM NEUTRALIZATION N 38 31 0 16 

BEAM PLASMA AMPLIFIERS N 60 464 1 30 

BEAM RIDER GUIDANCE N 9 24 0 52 

BEAM SPLITTERS N 277 637 3 169 

BEAM SWITCHING N 90 249 3 50 

BEAM WAVEGUIDES N 181 327 2 108 

BEAMS N 20 11 4 23 

BEAMS (RADIATION) N 1237 1139 50 921 

BEAMS (SUPPORTS) N 1342 3435 150 532 

BEARING N 20 16 2 18 

BEARING (DIRECTION) N 451 200 8 451 

BEARING ALLOYS N 42 103 4 49 

BEARINGLESS ROTORS N 41 81 1 18 

BEARINGS N 853 909 111 870 

BEARS N 4 1 1 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

BEAT FREQUENCIES N 46 671 1 16 

BEAUFORT SEA (NORTH AMERICA) N 80 60 3 37 

BED REST N 251 284 3 109 

BEDDING EQUIPMENT N 6 2 0 12 

BEDIASITES N 0 6 0 1 

BEDROCK N 138 96 8 58 

BEDS N 9 11 2 11 

BEDS (GEOLOGY) N 53 28 8 65 

BEDS (PROCESS ENGINEERING) N 324 95 16 151 

BEECH 99 AIRCRAFT N 3 0 0 0 

BEECHCRAFT AIRCRAFT N 37 45 4 21 

BEECHCRAFT 18 AIRCRAFT N 4 1 0 0 

BEER LAW N 31 77 0 4 

BEES N 11 7 4 8 

BEETLES N 22 29 6 9 

BEHAVIOR N 487 192 238 712 

BELGIAN SPACE PROGRAM N 6 2 0 7 

BELGIUM N 560 76 10 104 

BELIZE N 2 2 1 0 

BELL AIRCRAFT N 23 66 0 19 

BELL 214A HELICOPTER N 1 1 0 1 

BELLMAN THEORY N 19 198 6 6 

BELLOWS N 96 51 4 208 

BELLS N 2 1 1 3 

BELTRAMI FLOW N 4 36 0 1 

BELTS N 21 25 1 13 

BENARD CELLS N 25 401 1 3 

BEND TESTS N 158 687 0 24 

BENDING N 1097 1774 52 604 

BENDING DIAGRAMS N 1 1 91 0 10 

BENDING FATIGUE N 201 909 4 110 

BENDING MOMENTS N 615 2439 23 310 

BENDING THEORY N 91 2467 12 32 

BENDING VIBRATION N 134 1830 10 53 

BENEFICIATION N 48 13 3 38 

BENIN N 3 1 0 0 

BENTONITE N 15 14 1 12 

BENZENE N 570 273 25 334 

BENZENE POISONING N 15 3 1 6 

BENZILIC ACID N 6 0 0 2 

BENZOIC ACID N 49 23 0 30 

BERENICE ROCKET VEHICLE N 0 2 0 0 

BERGMAN OPERATOR N 5 13 1 2 

BERING SEA N 97 51 9 57 

BERKELIUM N 10 0 0 2 

BERMUDA N 25 21 10 13 

BERNOULLI THEOREM N 153 451 38 59 

BERNSTEIN ENERGY PRINCIPLE N 31 52 0 4 

BERYL N 13 19 4 17 

BERYLLIUM N 751 954 56 851 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM :+.'1':***** TYPE STAR IAA NLN OTHER 

BERYLLIUM ALLOYS N 132 238 5 156 

BERYLLIUM BOROHYDRIDES N 1 2 0 5 

BERYLLIUM CHLORIDES N 1 2 0 5 

BERYLLIUM COMPOUNDS N 70 74 6 104 

BERYLLIUM FLUORIDES N 16 13 1 15 

BERYLLIUM HYDRIDES N 10 8 0 116 

BERYLLIUM ISOTOPES N 60 53 0 13 

BERYLLIUM NITRIDES N 2 5 0 2 

BERYLLIUM OXIDES N 185 167 5 276 

BERYLLIUM POISONING N 7 5 2 15 

BERYLLIUM 10 N 20 74 0 4 

BERYLLIUM 7 N 30 49 0 6 

BERYLLIUM 9 N 41 18 0 9 

BESS (SATELLITE) N 1 1 0 9 

BESSEL FUNCTIONS N 504 2356 95 215 

BESSEL-BREDICHIN THEORY N 2 3 0 0 

BETA FACTOR N 125 188 1 28 

BETA PARTICLES N 732 218 28 251 

BETAINES N 3 1 0 0 

BETATRONS N 152 80 2 71 

BETHE-HEITLER FORMULA N 11 6 0 4 

BETHE-SALPETER EQUATION N 71 39 1 15 

BEVATRON N 38 7 0 11 

BEVERAGES N 21 8 4 33 

BHUTAN N 0 0 1 0 

BIAS N 543 834 20 234 

BIBLIOGRAPHIES N 7311 1444 6031 7373 2

BICRYSTALS N 57 92 0 16 

BICYCLE N 13 34 1 12 

BIDIRECTIONAL REFLECTANCE N 89 229 0 24 

BIFURCATION (BIOLOGY) N 15 12 4 7 

BIG BANG COSMOLOGY N 119 1505 15 23 

BIG SHOT PROJECT N 0 0 0 1 

BIGHORN MOUNTAINS (MT-WY) N 23 3 0 1 

BIHARMONIC EQUATIONS N 30 275 0 10 

BILLETS N 93 81 1 269 

BIMETALS N 103 179 5 95 

BIMETRIC THEORIES N 4 27 0 1 

BINARY ALLOYS N 470 1680 21 206 

BINARY CODES N 256 783 24 122 

BINARY DATA N 329 810 33 242 

BINARY DIGITS N 141 131 16 79 

BINARY FLUIDS N 138 209 3 47 

BINARY INTEGRATION N 56 20 3 25 

BINARY MIXTURES N 326 784 13 127 

BINARY STARS N 720 6670 70 350 

BINARY SYSTEMS (MATERIALS) N 385 622 33 200 

BINARY TO DECIMAL CONVERTERS N 15 7 2 8 

BINAURAL HEARING N 40 51 3 6 

BINDERS (MATERIALS) N 246 328 6 404 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

BINDING N 66 78 19 45 

BINOCULAR VISION N 64 390 10 25 

BINOCULARS N 29 20 3 59 

BINOMIAL COEFFICIENTS N 18 13 6 6 

BINOMIAL THEOREM N 36 40 14 15 

BINOMIALS N 94 52 7 27 

BIOACOUSTICS N 106 111 10 176 

BIOASSAY N 581 235 66 412 

BIOASTRONAUTICAL ORBITAL SPACE SYSTEM N 6 1 0 0 

BIOASTRONAUTICS N 410 831 87 336 

BIOCHEMICAL FUEL CELLS N 24 10 0 5 

BIOCHEMICAL OXYGEN DEMAND N 89 59 6 67 

BIOCHEMISTRY N 1284 1605 1281 1313 

BIOCOMPATIBILITY N 9 4 5 13 

BIOCONTROL SYSTEMS N 74 800 51 32 

BIOCONVERSION N 162 37 13 115 

BIODEGRADABILITY N 37 7 3 17 

BIODEGRADATION N 203 66 19 205 

BIODYNAMICS N 541 717 125 248 

BIOELECTRIC POTENTIAL N 173 918 22 39 

BIOELECTRICITY N 240 817 82 158 

BIOENGINEERING N 561 273 290 358 

BIOFEEDBACK N 23 33 7 9 

BIOFLAVONOIDS N 1 5 0 1 

BIOGENY N 25 37 21 25 

BIOGEOCHEMISTRY N 142 257 61 151 

BIOGRAPHY N 55 47 799 62 

BIOINSTRUMENTATION N 524 805 133 474 

BIOLOGICAL EFFECTS N 2578 1372 324 1536 

BIOLOGICAL EVOLUTION N 314 1212 249 319 

BIOLOGICAL MODELS (MATHEMATICS) N 187 807 36 52 

BIOLOGY N 266 119 672 467 

BIOLUMINESCENCE N 85 44 17 83 

BIOMAGNETISM N 34 87 6 13 

BIOMASS N 530 333 23 328 

BIOMASS ENERGY PRODUCTION N 588 524 70 445 

BIOMEDICAL DATA N 677 532 251 643 

BIOMETEOROLOGY N 102 97 46 38 

BIOMETRICS N 285 708 145 206 

BIONICS N 417 1356 76 250 

BIOPAKS N 1 1 6 0 9 

BIOPHYSICS N 305 417 205 350 

BIOPOLYMER DENATURATION N 19 14 0 0 

BIOPOLYMERS N 29 35 0 17 

BIOPROCESSING N 34 47 0 60 

BIOREACTORS N 56 16 0 24 

BIDS PROJECT N 2 2 0 11 

BIOSATELLITE 1 N 1 0 0 0 

BIOSATELLITE 2 N 30 17 1 16 

BIOSATELLITE 3 N 7 15 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *****•* TYPE STAR IAA NLN OTHER 

BIOSATELLITES N 138 147 6 105 

BIOSPHERE N 139 262 42 125 

BIOSYNTHESIS N 240 423 121 189 

BlOT METHOD N 33 124 0 5 

BlOT NUMBER N 8 67 0 6 

BIOTECHNOLOGY N 428 445 70 529 

BIOTELEMETRY N 178 365 34 130 

BIOTIN N 6 5 2 6 

BIOTITE N 18 68 2 15 

BIPLANES N 17 35 9 7 

BIPOLAR TRANSISTORS N 263 1120 40 279 

BIPOLARITY N 110 148 4 80 

BIRD-AIRCRAFT COLLISIONS N 154 129 3 82 

BIRDS N 304 202 115 148 

BIREFRINGENCE N 388 1190 20 178 

BIREFRINGENT COATINGS N 22 55 3 8 

BIREFRINGENT FILTERS N 15 27 0 11 

BIRKELAND CURRENTS N 64 219 0 4 

BIRTH N 21 16 20 14 

BISMALEIMIDE N 19 127 0 9 

BISMUTH N 287 221 11 207 

BISMUTH ALLOYS N 88 131 1 65 

BISMUTH COMPOUNDS N 111 273 5 73 

BISMUTH ISOTOPES N 48 8 0 11 

BISMUTH OXIDES N 101 497 0 13 

BISMUTH SULFIDES N 8 8 0 2 

BISMUTH TELLURIDES N 18 61 0 23 

BISPHENOLS N 20 35 0 12 

BISTABLE CIRCUITS N 63 258 3 42 

BISTATIC REFLECTIVITY N 70 145 0 95 

BIT ERROR RATE N 170 925 0 26 

BIT SYNCHRONIZATION N 154 629 1 49 

BITERNARY CODE N 25 14 0 8 

BITS N 196 260 12 133 

BITUMENS N 169 111 11 147 

BIVARIATE ANALYSIS N 237 85 4 55 

BL LACERTAE OBJECTS N 98 658 1 14 

BLACK AND WHITE PHOTOGRAPHY N 104 235 5 61 

BLACK BODY RADIATION N 463 1725 31 299 

BLACK BRANT SOUNDING ROCKETS N 46 45 0 63 

BLACK BRANT 1 SOUNDING ROCKET N 0 1 0 0 

BLACK BRANT 2 SOUNDING ROCKET N 6 5 0 6 

BLACK BRANT 3 SOUNDING ROCKET N 8 8 0 0 

BLACK BRANT 4 SOUNDING ROCKET N 6 5 0 2 

BLACK BRANT 5 SOUNDING ROCKET N 8 17 1 4 

BLACK HILLS (SD-WY) N 45 6 7 0 

BLACK HOLES (ASTRONOMY) N 282 2949 55 69 

BLACK KNIGHT ROCKET VEHICLE N 31 31 0 23 

BLACK SEA N 69 75 0 65 

BLACKOUT N 1 5 0 1 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM "'****** TYPE STAR IAA NLN OTHER 

BLACKOUT (PHYSIOLOGY) N 19 49 1 12 

BLACKOUT (PROPAGATION) N 93 41 1 246 

BLACKOUT PREVENTION N 9 19 0 11 

BLADDER N 12 25 2 50 

BLADE SLAP NOISE N 83 139 0 52 

BLADE TIPS N 455 570 1 180 

BLADE-VORTEX INTERACTION N 145 252 0 70 

BLADES N 55 73 1 93 

BLADES (CUTTERS) N 48 12 2 34 

BLANKETS N 20 38 0 6 

BLANKETS (FISSION REACTORS) N 20 7 0 9 

BLANKETS (FUSION REACTORS) N 180 165 1 35 

BLANKING N 1 5 0 2 

BLANKING (CUTTING) N 4 15 0 11 

BLANKS N 14 53 1 10 

BLASIUS EQUATION N 18 88 0 8 

BLASIUS FLOW N 38 214 0 12 

BLAST DEFLECTORS N 26 5 0 41 

BLAST LOADS N 368 198 10 428 

BLASTS N 30 69 5 46 

BLAZARS N 7 82 0 1 

BLEACHING N 26 130 2 23 

BLEEDING N 13 42 0 15 

BLIGHT N 33 43 14 4 

BLIND LANDING N 18 42 2 5 

BLINDNESS N 43 33 9 36 

BLINDS N 8 3 1 4 

BLINKING N 8 4 0 1 

BLISTERS N 7 43 0 6 

BLOCH BAND N 31 92 3 24 

BLOCK COPOLYMERS N 8 2 0 2 

BLOCK DIAGRAMS N 374 4751 13 248 

BLOCK ISLAND SOUND (RI) N 13 1 0 7 

BLOCKING N 198 239 7 86 

BLOCKS N 79 73 3 41 

BLOEDITE N 1 2 0 0 

BLOOD N 604 437 125 649 

BLOOD CELLS N 33 38 10 10 

BLOOD CIRCULATION N 510 780 81 242 

BLOOD COAGULATION N 105 136 17 42 

BLOOD FLOW N 370 1231 45 176 

BLOOD GROUPS N 0 14 6 9 

BLOOD PLASMA N 243 990 20 143 

BLOOD PRESSURE N 462 1517 34 245 

BLOOD PUMPS N 16 2 1 9 

BLOOD VESSELS N 159 282 37 89 

BLOOD VOLUME N 137 415 9 66 

BLOOD-BRAIN BARRIER N 3 12 1 1 

BLOWDOWN WIND TUNNELS N 117 270 1 39 

BLOWERS N 73 83 15 103 
NASA COMBINED FILE POSTING STATISTICS 

910117 

•****'~"* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

BLOWING N 157 860 5 74 

BLOWOUTS N 14 27 0 20 

BLUE GOOSE MISSILE N 3 0 0 4 

BLUE GREEN ALGAE N 62 80 14 48 

BLUE SCOUT ROCKET VEHICLE N 0 2 0 3 

BLUE STARS N 28 520 1 8 

BLUE STEEL MISSILE N 1 0 0 1 

BLUE STREAK LAUNCH VEHICLE N 15 11 1 57 

BLUE STREAK MISSILE N 1 0 0 7 

BLUEPRINTS N 15 3 24 22 

BLUFF BODIES N 141 577 5 60 

BLUNT BODIES N 899 2016 1 1 719 

BLUNT LEADING EDGES N 11 52 0 13 

BLUNT TRAILING EDGES N 8 19 0 7 

BLURRING N 56 258 0 11 

B0-105 HELICOPTER N 41 57 1 6 

BOARDS (PAPER) N 22 9 5 24 

BOATS N 54 20 26 117 

BOATTAILS N 159 106 0 125 

BODIES N 21 11 3 18 

BODIES OF REVOLUTION N 697 2599 15 478 

BODY CENTERED CUBIC LATTICES N 195 2247 1 68 

BODY COMPOSITION (BIOLOGY) N 44 127 11 23 

BODY FLUIDS N 297 339 59 158 

BODY KINEMATICS N 143 1171 24 51 

BODY MEASUREMENT (BIOLOGY) N 127 134 9 103 

BODY SIZE (BIOLOGY) N 49 75 9 28 

BODY SWAY TEST N 21 36 0 3 

BODY TEMPERATURE N 516 1295 43 263 

BODY VOLUME (BIOLOGY) N 22 83 0 7 

BODY WEIGHT N 173 552 2 75 

BODY-WING AND TAIL CONFIGURATIONS N 190 246 7 125 

BODY-WING CONFIGURATIONS N 480 642 10 426 

BOEING AIRCRAFT N 37 258 11 69 

BOEING 2707 AIRCRAFT N 4 9 0 6 

BOEING 707 AIRCRAFT N 90 79 2 19 

BOEING 720 AIRCRAFT N 15 18 0 11 

BOEING 727 AIRCRAFT N 95 91 2 21 

BOEING 733 AIRCRAFT N 0 0 0 3 

BOEING 737 AIRCRAFT N 90 1 11 0 34 

BOEING 747 AIRCRAFT N 171 366 3 84 

BOEING 757 AIRCRAFT N 9 90 0 0 

BOEING 767 AIRCRAFT N 5 101 0 4 

BOGOLIUBOV THEORY N 43 204 2 11 

BOHR MAGNETON N 6 17 0 1 

BOHR THEORY N 22 33 12 12 

BOILER PLATE N 19 7 0 51 

BOILERS N 853 510 105 731 

BOILING N 413 363 36 204 

BOILING WATER REACTORS N 225 19 7 73 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *•***** TYPE STAR IAA NLN OTHER 

BOLIDES N 28 97 0 6 

BOLIVIA N 78 33 3 14 

BOLKOW AIRCRAFT N 1 1 0 0 

BOLL WEEVILS N 3 0 0 0 

BOLLWORMS N 10 0 0 0 

BOLOMETERS N 221 615 13 146 

BOLTED JOINTS N 129 185 0 39 

BOLTS N 259 279 15 252 

BOLTZMANN DISTRIBUTION N 165 456 5 76 

BOLTZMANN TRANSPORT EQUATION N 723 2037 54 238 

BOLTZMANN-VLASOV EQUATION N 74 65 6 31 

BOLZA PROBLEMS N 14 31 2 7 

BOMARC A MISSILE N 0 0 0 5 

BOMARC B MISSILE N 0 0 0 4 

BOMARC MISSILES N 0 0 0 6 

BOMB CALORIMETERS N 6 10 0 7 

BOMBARDMENT N 31 26 5 35 

BOMBER AIRCRAFT N 116 150 70 914 

BOMBING EQUIPMENT N 28 27 5 251 

BOMBS N 3 17 2 14 

BOMBS (ORDNANCE) N 156 36 19 1299 

BOND GRAPHS N 8 26 4 1 

BONDING N 916 493 78 1148 

BONDOC METEORITE N 0 3 0 0 

BONE DEMINERALIZATION N 128 98 6 73 

BONE MARROW N 144 181 16 91 

BONE MINERAL CONTENT N 108 85 9 39 

BONES N 311 165 93 281 

BONNE PROJECTION N 3 0 0 6 

BOOLEAN ALGEBRA N 384 223 127 171 

BOOLEAN FUNCTIONS N 183 228 13 101 

BOOM N 3 4 0 6 

BOOMS (EQUIPMENT) N 275 227 5 139 

BOOSTER RECOVERY N 41 48 1 65 

BOOSTER ROCKET ENGINES N 374 412 7 1236 

BOOSTER ROCKETS N 18 146 2 61 

BOOSTERS N 23 29 0 119 

BOOSTERS (EXPLOSIVES) N 15 5 0 45 

BOOSTGLIOE VEHICLES N 8 6 2 67 

BOOTS (FOOTWEAR) N 12 5 1 36 

BORAL N 1 5 0 2 

BORANES N 78 19 5 72 

BORATES N 91 79 4 82 

BORDERS N 8 10 0 5 

BORDONI PEAKS N 1 1 0 0 

BOREDOM N 17 18 2 10 

BOREHOLES N 247 23 2 178 

BOREL SETS N 88 73 9 29 

BORESIGHT ERROR N 31 56 0 52 

BORE SIGHTS N 58 126 0 191 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

BORIC ACIDS N 42 22 1 40 

BORIDES N 184 478 13 143 

BORING MACHINES N 48 20 11 58 

BORN APPROXIMATION N 425 641 7 99 

BORN-INFELD THEORY N 9 5 0 2 

BORN-OPPENHEIMER APPROXIMATION N 29 90 5 11 

BOROHYDRIDES N 19 12 1 19 

BORON N 968 1445 41 919 

BORON ALLOYS N 114 450 3 75 

BORON CARBIDES N 159 215 2 108 

BORON CHLORIDES N 19 46 0 13 

BORON COMPOUNDS N 230 157 28 281 

BORON FIBERS N 53 203 0 56 

BORON FLUORIDES N 47 33 0 35 

BORON HYDRIDES N 43 17 3 45 

BORON ISOTOPES N 73 60 1 12 

BORON NITRIDES N 174 331 3 169 

BORON OXIDES N 82 91 0 44 

BORON PHOSPHIDE$ N 15 9 0 14 

BORON REINFORCED MATERIALS N 99 403 4 79 

BORON 10 N 40 12 0 9 

BORON-EPOXY COMPOSITES N 45 225 2 23 

BOROSILICATE GLASS N 178 227 2 92 

BORSIC (TRADENAME) N 3 4 0 4 

BOSE GEOMETRY N 25 20 1 6 

BOSON FIELDS N 29 25 1 5 

BOSONS N 372 216 23 105 

BOTANY N 108 68 159 105 

BOTSWANA N 13 16 0 2 

BOTTLES N 26 8 2 42 

BOUGUER LAW N 70 144 1 59 

BOULES N 18 5 0 26 

BOUNDARIES N 909 286 33 538 

BOUNDARY CONDITIONS N 1984 6239 0 161 

BOUNDARY ELEMENT METHOD N 162 873 6 21 

BOUNDARY INTEGRAL METHOD N 79 601 6 18 

BOUNDARY LAYER COMBUSTION N 78 253 0 34 

BOUNDARY LAYER CONTROL N 677 785 20 629 

BOUNDARY LAYER EQUATIONS N 475 2473 16 137 

BOUNDARY LAYER FLOW N 2459 5655 100 1241 

BOUNDARY LAYER PLASMAS N 106 392 2 29 

BOUNDARY LAYER SEPARATION N 1481 2400 16 735 

BOUNDARY LAYER STABILITY N 395 1308 15 243 

BOUNDARY LAYER TRANSITION N 1213 1895 18 964 

BOUNDARY LAYERS N 2608 2636 182 1844 

BOUNDARY LUBRICATION N 85 202 4 26 

BOUNDARY VALUE PROBLEMS N 6070 26488 492 1934 3

BOURDON TUBES N 8 13 3 6 

BOUSSINESQ APPROXIMATION N 137 860 0 29 

BOW WAVES N 321 1398 5 114 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

BOWS N 1 6 0 1 

BOX BEAMS N 60 120 4 85 

BOXES N 5 30 0 4 

BOXES (CONTAINERS) N 78 30 2 104 

BRACKETS N 22 17 0 48 

BRADYCARDIA N 24 80 2 3 

BRAGG ANGLE N 242 816 5 127 

BRAGG CELLS N 62 151 0 20 

BRAGG CURVE N 11 17 0 5 

BRAILLE N 3 0 1 2 

BRAIN N 584 1058 346 522 

BRAIN CIRCULATION N 71 413 19 50 

BRAIN DAMAGE N 75 285 15 25 

BRAIN STEM N 36 107 7 16 

BRAKES N 4 8 1 8 

BRAKES (FOR ARRESTING MOTION) N 187 111 17 220 

BRAKES (FORMING OR BENDING) N 2 4 0 3 

BRAKING N 168 212 2 167 

BRANCHING (MATHEMATICS) N 416 1326 46 76 

BRANCHING (PHYSICS) N 152 423 2 30 

BRASSES N 184 170 6 94 

BRAVAIS CRYSTALS N 9 1 1 1 4 

BRAYTON CYCLE N 488 429 4 396 

BRAZIL N 713 260 34 115 

BRAZILIAN SPACE PROGRAM N 50 26 0 4 

BRAZING N 294 394 61 414 

BREADBOARD MODELS N 641 306 5 1064 

BREAKDOWN N 70 111 5 36 

BREAKING N 69 51 1 41 

BREAKWATERS N 38 8 3 42 

BREATHING N 29 166 4 22 

BREATHING APPARATUS N 177 78 8 189 

BREATHING VIBRATION N 4 23 0 2 

BRECCIA N 99 1097 6 53 

BREEDER REACTORS N 472 127 22 175 

BREEDING (REPRODUCTION) N 17 10 19 24 

BREGUET AIRCRAFT N 3 9 0 1 

BREGUET 1150 AIRCRAFT N 1 3 0 1 

BREGUET 940 AIRCRAFT N 0 1 0 0 

BREGUET 941 AIRCRAFT N 8 7 0 0 

BREMSSTRAHLUNG N 894 1982 18 310 

BREWSTER ANGLE N 34 263 0 10 

BRICKS N 25 11 19 20 

BRIDGES N 8 27 2 24 

BRIDGES (LANDFORMS) N 1 5 0 1 

BRIDGES (STRUCTURES) N 300 46 49 386 

BRIDGMAN METHOD N 67 162 1 94 

BRIGHTNESS N 982 2602 15 514 

BRIGHTNESS DISCRIMINATION N 68 182 3 40 

BRIGHTNESS DISTRIBUTION N 156 1535 3 61 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM '*"'"***** TYPE STAR IAA NLN OTHER 

BRIGHTNESS TEMPERATURE N 672 2984 0 236 

BRILLOUIN EFFECT N 229 726 6 89 

BRILLOUIN FLOW N 23 22 1 12 

BRILLOUIN ZONES N 194 205 7 81 

BRILLOUIN-WIGNER EQUATION N 1 0 1 1 

BRINES N 285 74 6 190 

BRIQUETS N 7 10 2 8 

BRISTOL-SIDDELEY BS 53 ENGINE N 12 23 0 8 

BRISTOL-SIDDELEY OLYMPUS 593 ENGINE N 1 15 0 3 

BRISTOL-SIDDELEY VIPER ENGINE N 0 1 0 0 

BRITISH COLUMBIA N 6 33 5 4 

BRITTLE MATERIALS N 181 1222 8 96 

BRITTLENESS N 734 1417 58 374 

BROADBAND N 1136 2308 15 1285 

BROADBAND AMPLIFIERS N 120 595 9 139 

BROADCASTING N 598 964 135 367 

BROKEN SYMMETRY N 124 238 1 49 

BROMATES N 8 6 0 6 

BROMIDES N 207 259 5 110 

BROMINATION N 28 19 2 13 

BROMINE N 189 210 10 103 

BROMINE COMPOUNDS N 127 124 2 76 

BROMINE ISOTOPES N 22 10 1 7 

BRONCHI N 24 65 3 8 

BRONZES N 171 122 6 101 

BROTHS N 3 2 0 2 

BROWN DWARF STARS N 8 88 0 4 

BROWN WAVE EFFECT N 3 3 0 0 

BROWNIAN MOVEMENTS N 256 287 43 102 

BRUCITE N 0 5 0 1 

BRUDERHEIM METEORITE N 4 13 0 0 

BRUNEI N 1 0 1 1 

BRUNT-VAISALA FREQUENCY N 10 60 0 4 

BRUSH (BOTANY) N 27 7 2 3 

BRUSHES N 55 38 1 60 

BRUSHES (ELECTRICAL CONTACTS) N 40 45 1 21 

BRYOPHYTES N 2 4 2 0 

BSX N 1 0 0 0 

BUBBLE CHAMBERS N 579 44 13 151 

BUBBLE MEMORY DEVICES N 80 215 16 117 

BUBBLE TECHNIQUE N 30 51 8 35 

BUBBLES N 1096 1478 38 584 

BUCCANEER AIRCRAFT N 2 6 1 10 

BUCKET BRIGADE DEVICES N 7 19 1 7 

BUCKETS N 10 16 0 9 

BUCKLING N 1483 3069 102 620 

BUDGETING N 477 145 249 486 

BUDGETS N 119 87 53 403 

BUFFER STORAGE N 241 231 3 162 

BUFFERS N 20 60 0 25 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**•  SUBJECT TERM ** ***** TYPE STAR IAA NLN OTHER 

BUFFERS (CHEMISTRY) N 78 119 5 40 

BUFFETING N 230 133 5 215 

BUILDINGS N 950 396 449 753 

BULBS N 13 23 1 18 

BULGARIA N 59 74 6 100 

BULGING N 29 43 0 25 

BULK ACOUSTIC WAVE DEVICES N 19 86 1 7 

BULK MODULUS N 106 125 1 46 

BULKHEADS N 53 51 2 107 

BULLPUP B MISSILE N 0 0 0 2 

BULLPUP MISSILES N 0 0 0 32 

BUMBLEBEE PROJECT N 1 2 0 14 

BUMPERS N 25 15 2 32 

BUMPY TORUSES N 171 14 0 23 

BUNA (TRADEMARK) N 3 1 0 7 

BUNCHING N 94 40 1 27 

BUNDLE DRAWING N 0 5 0 8 

BUNDLES N 110 58 5 63 

BUNKERS (FUEL) N 0 0 0 3 

BUOYANCY N 508 1165 14 247 

BUOYS N 494 226 14 305 

BURAN SPACE SHUTTLE N 11 21 0 27 

BUREAUS (ORGANIZATIONS) N 46 19 50 48 

BURETTES N 4 1 0 3 

BURGER EQUATION N 88 515 3 19 

BURKINA N 20 22 1 1 

BURMA N 8 5 5 8 

BURN-IN N 7 32 0 3 

BURNERS N 274 289 5 259 

BURNING RATE N 1145 1971 13 2213 

BURNING TIME N 100 130 1 113 

BURNOUT N 102 81 0 110 

BURNS (INJURIES) N 95 85 8 133 

BURNTHROUGH (FAILURE) N 26 51 0 31 

BURST TESTS N 35 42 0 11 

BURSTS N 200 719 3 116 

BURUNDI N 1 1 4 0 

BUS CONDUCTORS N 221 163 5 133 

BUSHINGS N 48 34 3 60 

BUTADIENE N 115 67 9 159 

BUTANES N 151 110 3 98 

BUTENES N 107 33 3 101 

BUTT JOINTS N 122 243 3 118 

BUTTERFLY VALVES N 17 6 2 30 

BUTTES N 4 3 1 3 

BUTTONS N 1 7 0 4 

BUTYRIC ACID N 15 32 3 25 

BY-PRODUCTS N 122 31 4 75 

BYPASS RATIO N 45 167 0 77 

BYPASSES N 234 242 3 140 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******'*' SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

c (PROGRAMMING LANGUAGE) N 81 37 0 25 

C BAND N 273 418 0 330 

C-1A AIRCRAFT N 3 3 0 7 

C-118 AIRCRAFT N 2 1 0 4 

C- 119 AIRCRAFT N 0 1 0 8 

C-121 AIRCRAFT N 1 2 1 9 

C-123 AIRCRAFT N 0 1 0 10 

C-124 AIRCRAFT N 1 1 0 5 

C-130 AIRCRAFT N 99 122 1 283 

C-131 AIRCRAFT N 7 5 0 19 

C-133 AIRCRAFT N 0 5 0 6 

C-135 AIRCRAFT N 162 117 0 241 

C-140 AIRCRAFT N 17 12 1 14 

C-141 AIRCRAFT N 130 127 4 296 

C-15 AIRCRAFT N 8 16 0 8 

C-160 AIRCRAFT N 9 5 0 4 

C-2 AIRCRAFT N 8 2 1 19 

C-33 AIRCRAFT N 0 0 0 1 

C-35 AIRCRAFT N 0 2 0 1 

C-46 AIRCRAFT N 2 0 1 4 

C-47 AIRCRAFT N 5 7 1 13 

C-5 AIRCRAFT N 70 157 7 356 

C-54 AIRCRAFT N 7 8 0 3 

C-8A AUGMENTOR WING AIRCRAFT N 2 0 0 0 

C-9 AIRCRAFT N 5 2 0 10 

CABIN ATMOSPHERES N 149 185 8 112 

CABINS N 6 54 0 12 

CABLE FORCE RECORDERS N 7 2 1 5 

CABLE TELEVISION N 56 42 0 19 

CABLES N 82 85 14 108 

CABLES (ROPES) N 352 187 16 366 

CADASTRAL MAPPING N 73 48 5 6 

CADMIUM N 568 443 20 363 

CADMIUM ALLOYS N 67 68 2 69 

CADMIUM ANTIMONIDES N 6 36 0 4 

CADMIUM CHLORIDES N 8 12 0 8 

CADMIUM COMPOUNDS N 143 197 3 119 

CADMIUM FLUORIDES N 16 14 0 4 

CADMIUM ISOTOPES N 57 22 0 9 

CADMIUM SELENIDES N 127 354 4 64 

CADMIUM SULFIDES N 551 1534 8 354 

CADMIUM TELLURIDES N 354 BOO 6 256 

CAFFEINE N 27 29 0 11 

CAISSONS N 11 13 2 3 

CAJUN ROCKET VEHICLE N 2 0 1 2 

CALCIFEROL N 20 25 10 9 

CALCIFICATION N 53 28 12 20 

CALCITE N 66 57 0 39 

CALCIUM N 632 1440 48 382 

CALCIUM CARBONATES N 76 74 5 46 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CALCIUM CHLORIDES N 49 54 0 24 

CALCIUM COMPOUNDS N 240 266 3 145 

CALCIUM FLUORIDES N 194 184 1 94 

CALCIUM ISOTOPES N 93 56 1 27 

CALCIUM METABOLISM N 127 244 31 63 

CALCIUM OXIDES N 260 609 2 114 

CALCIUM PHOSPHATES N 28 56 1 26 

CALCIUM SILICATES N 30 17 2 4 

CALCIUM SULFIDES N 17 12 0 19 

CALCIUM TUNGSTATES N 20 32 0 8 

CALCIUM VANADATES N 1 0 0 0 

CALCULATORS N 149 123 146 127 

CALCULI N 5 8 3 3 

CALCULUS N 182 40 422 58 

CALCULUS OF VARIATIONS N 760 1872 194 249 

CALDERAS N 43 83 3 31 

CALENDARS N 64 14 23 31 

CALIBRATING N 5557 7051 139 3513 1

CALIFORNIA N 1727 443 335 1160 

CALIFORNIUM N 18 0 0 8 

CALIFORNIUM COMPOUNDS N 3 0 0 0 

CALIFORNIUM ISOTOPES N 101 25 2 19 

CALLISTO N 28 128 1 25 

CALMODULIN N 12 12 0 1 

CALORIC REQUIREMENTS N 45 45 18 23 

CALORIC STIMULI N 33 78 0 5 

CALORIMETERS N 774 801 29 436 

CALVES N 5 8 0 3 

CAMBER N 128 144 0 105 

CAMBERED WINGS N 97 102 0 71 

CAMBODIA N 11 2 0 5 

CAMBRIAN PERIOD N 0 1 0 0 

CAMERA SHUTTERS N 91 152 4 84 

CAMERA TUBES N 93 77 5 97 

CAMERAS N 1105 1430 75 1096 

CAMEROON N 4 6 3 1 

CAMOUFLAGE N 55 17 1 261 

CAMPBELL-HAUSDORFF SERIES N 3 4 0 1 

CAMPHOR N 5 7 0 14 

CAMS N 92 27 19 65 

CANADA N 883 1149 368 860 

CANADAIR AIRCRAFT N 9 18 0 4 

CANADIAN SHIELD N 14 25 1 8 

CANADIAN SPACE PROGRAM N 25 123 2 30 

CANADIAN SPACECRAFT N 1 26 0 0 

CANALS N 56 36 10 67 

CANARD CONFIGURATIONS N 286 420 2 393 

CANARY ISLANDS N 6 42 0 2 

CANBERRA AIRCRAFT N 12 5 0 12 

CANCELLATION N 69 51 2 82 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CANCELLATION CIRCUITS N 14 77 0 12 

CANCER N 189 98 135 197 

CANNING N 18 9 6 19 

CANNONBALL 2 SATELLITE N 1 1 0 0 

CANNULAE N 1 9 0 6 

CANONICAL FORMS N 467 1972 56 133 

CANOPIES N 157 263 1 296 

CANOPIES (VEGETATION) N 443 623 3 117 

CANS N 129 28 2 106 

CANT! LEVER BEAMS N 386 1841 1 147 

CANTILEVER MEMBERS N 54 336 2 32 

CANTILEVER PLATES N 35 238 2 17 

CANYONS N 33 19 6 25 

CAP CLOUDS N 27 14 0 3 

CAPACITANCE N 882 2068 22 720 

CAPACITANCE SWITCHES N 54 64 5 26 

CAPACITANCE-VOLTAGE CHARACTERISTICS N 34 302 0 1 

CAPACITIVE FUEL GAGES N 5 3 0 4 

CAPACITORS N 1086 1107 65 2608 

CAPACITY N 56 139 3 35 

CAPE HATTERAS (NC) N 13 7 0 8 

CAPE KENNEDY LAUNCH COMPLEX N 193 147 12 373 

CAPE VERDE N 0 0 0 1 

CAPES (LANDFORMS) N 19 6 0 7 

CAPILLARIES N 8 76 1 21 

CAPILLARIES (ANATOMY) N 30 122 3 24 

CAPILLARY FLOW N 361 675 11 152 

CAPILLARY TUBES N 171 194 3 108 

CAPILLARY WAVES N 67 122 4 42 

CAPS N 6 19 0 8 

CAPS (EXPLOSIVES) N 7 4 0 13 

CAPSULES N 15 21 0 28 

CAPTIVE TESTS N 80 32 1 742 

CAPTURE EFFECT N 276 518 8 98 

CAPTURED AIR BUBBLE VEHICLES N 7 13 0 12 

CARBAMATES (TRADENAME) N 30 5 1 13 

CARBAMIDES N 10 7 1 6 

CARBAZOLES N 12 14 0 7 

CARBENES N 24 15 14 14 

CARBIDES N 636 1107 32 487 

CARBOHYDRATE METABOLISM N 93 319 23 44 

CARBOHYDRATES N 138 105 70 111 

CARBON N 2656 4117 203 1822 

CARBON ARCS N 24 19 3 25 

CARBON COMPOUNDS N 350 503 99 276 

CARBON CYCLE N 125 116 10 81 

CARBON DIOXIDE N 2734 4379 90 1571 

CARBON DIOXIDE CONCENTRATION N 345 919 16 191 

CARBON DIOXIDE LASERS N 1797 6710 24 1467 

CARBON DIOXIDE REMOVAL N 132 217 1 83 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CARBON DIOXIDE TENSION N 19 207 0 6 

CARBON DISULFIDE N 68 202 1 34 

CARBON FIBER REINFORCED PLASTICS N 811 2949 13 251 

CARBON FIBERS N 856 1523 35 1030 

CARBON ISOTOPES N 183 471 13 83 

CARBON LASERS N 18 10 2 24 

CARBON MONOXIDE N 2026 4747 41 976 

CARBON MONOXIDE LASERS N 144 632 2 135 

CARBON MONOXIDE POISONING N 46 78 2 25 

CARBON STARS N 60 911 2 20 

CARBON STEELS N 518 888 35 227 

CARBON SUBOXIDES N 2 6 0 1 

CARBON TETRACHLORIDE N 123 133 1 54 

CARBON TETRACHLORIDE POISONING N 3 5 0 4 

CARBON TETRAFLUORIDE N 30 71 0 8 

CARBON 12 N 161 180 1 61 

CARBON 13 N 148 294 14 69 

CARBON 14 N 158 248 1 86 

CARBON-CARBON COMPOSITES N 245 466 7 1318 

CARBONACEOUS CHONDRITES N 57 646 0 45 

CARBONACEOUS MATERIALS N 113 90 5 116 

CARBONACEOUS METEORITES N 47 301 5 60 

CARBONACEOUS ROCKS N 34 38 10 33 

CARBONATES N 399 339 32 314 

CARBONIC ACID N 21 18 3 15 

CARBONIC ANHYDRASE N 18 13 2 6 

CARBONIZATION N 78 115 18 95 

CARBONYL COMPOUNDS N 260 239 38 130 

CARBORANE N 118 11 3 107 

CARBORUNDUM (TRADEMARK) N 12 11 0 8 

CARBOXYHEMOGLOBIN N 20 27 0 11 

CARBOXYHEMOGLOBIN TEST N 7 13 3 1 

CARBOXYL GROUP N 40 28 3 59 

CARBOXYLATES N 32 10 1 25 

CARBOXYLATION N 14 8 4 11 

CARBOXYLIC ACIDS N 153 66 31 116 

CARBURETORS N 44 18 10 54 

CARBURIZING N 124 147 11 63 

CARCINOGENS N 213 72 73 166 

CARCINOTRONS N 15 34 0 13 

CARDIAC AURICLES N 9 84 2 4 

CARDIAC VENTRICLES N 85 969 5 43 

CARDIOGRAMS N 13 44 3 12 

CARDIOGRAPHY N 103 207 40 60 

CARDIOLOGY N 170 1002 134 78 

CARDIOTACHOMETERS N 25 15 0 10 

CARDIOVASCULAR SYSTEM N 1158 1777 241 652 

CARDS N 37 12 10 50 

CARET WINGS N 23 45 0 7 

CARGO N 244 69 44 452 
910117 

NASA 

******* SUBJECT TERM ******* 

CARGO AIRCRAFT 

CARGO SHIPS 

CARGO SPACECRAFT 

CARIBBEAN REGION 

CARIBBEAN SEA 

CARNOT 

CARNITINE 

CARIBOUS 

CYCLE 

CAROTID 

CAROTENE 

SINUS BODY 

CAROTID SINUS REFLEX 

CARPATHIAN MOUNTAINS (EUROPE) 

CARRIER 

CARRIAGES 

DENSITY (SOLID STATE) 

CARRIER FREQUENCIES 

CARRIER INJECTION 

CARRIER LIFETIME 

CARRIER MOBILITY 

CARRIER TO NOISE RATIOS 

CARRIER TRANSPORT (SOLID STATE) 

CARRIER WAVES 

CARTAN 

CARRIERS 

SPACE 

CARTESIAN COORDINATES 

CASCADE 

CARTS 

CARTRIDGES 

CARTILAGE 

CONTROL 

CASCADE FLOW 

CASCADE RANGE (CA-OR-WA) 

CASCADE WIND TUNNELS 

CASE 

CASCADES 

BONDED PROPELLANTS 

CASE HISTORIES 

CASES (CONTAINERS) 

CASPIAN 

CASING 

SEA 

CASSEGRAIN ANTENNAS 

CASSEGRAIN OPTICS 

CASSIN! MISSION 

CASSIOPEIA A 

CASSIOPEIA CONSTELLATION 

CAST ALLOYS 

CASTIGLIANO VARIATIONAL THEOREM 

CASTOR 

CASTINGS 

CASTING 

OIL 

CATABOLISM 

CASUALTIES 

CASTS 

COMBINED FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

165 

STAR 

21 

29 

46 

178 

10 

2 

12 

10 

11 

48 

8 

86 

20 

347 

146 

124 

294 

58 

42 

108 

24 

11 

555 

72 

18 

6 

129 

1009 

44 

105 

24 

89 

236 

13 

33 

83 

225 

169 

14 

20 

38 

189 

10 

275 

621 

11 

5 

24 

93 

STATISTICS 

IAA 

338 

18 

106 

60 

19 

2 

1 

165 

11 

10 

94 

49 

15 

1041 

768 

1004 

368 

1188 

291 

683 

206 

60 

12 

1666 

34 

17 

2 

349 

2594 

17 

274 

118 

32 

368 

34 

107 

40 

833 

530 

58 

121 

175 

1045 

70 

261 

536 

10 

7 

54 

23 

19 

NLN 

8 

0 

5 

23 

1 

2 

2 

5 

0 

2 

0 

5 

2 

1 

0 

0 

0 

0 

7 

0 

28 

7 

0 

3 

7 

25 

0 

0 

2 

2 

226 

0 

0 

0 

1 

0 

1 

3 

10 

4 

34 

86 

4 

2 

1 

1 

OTHER 

235 

91 

11 

43 

71 

1 

2 

26 

7 

4 

5 

4 

20 

63 

152 

16 

31 

116 

4 

11 

33 

45 

11 

245 

13 

354 

49 

12 

286 

52 

50 

23 

116 

130 

120 

70 

35 

16 

100 

40 

8 

18 

137 

3 

347 

674 

4 

13 

148 

15 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CATACLYSMIC VARIABLES N 83 596 5 18 

CATALASE N 16 28 1 10 

CATALOGS N 99 41 121 66 

CATALOGS (PUBLICATIONS) N 467 85 492 414 

CATALYSIS N 781 498 235 591 

CATALYSTS N 1587 530 128 1541 

CATALYTIC ACTIVITY N 593 702 47 392 

CATAPULTS N 68 57 1 230 

CATARACTS N 42 44 4 21 

CATASTROPHE THEORY N 25 168 18 12 

CATCHERS N 7 6 0 2 

CATECHOLAMINE N 108 319 17 58 

CATEGORIES N 76 19 25 24 

CATENARIES N 9 10 1 6 

CATHETERIZATION N 28 152 7 14 

CATHETOMETERS N 8 13 0 10 

CATHODE GLOW N 12 55 2 2 

CATHODE RAY TUBES N 743 884 74 716 

CATHODES N 1092 1021 26 951 

CATHODIC COATINGS N 44 24 4 36 

CATHODOLUMINESCENCE N 37 85 2 9 

CATHOLYTES N 7 6 0 8 

CATIONS N 534 634 30 274 

CATS N 166 835 13 97 

CATT DEVICES N 1 2 0 0 

CATTLE N 43 34 3 42 

CAUCASUS MOUNTAINS (U.S.S.R.) N 9 36 1 8 

CAUCHY INTEGRAL FORMULA N 70 292 16 26 

CAUCHY PROBLEM N 412 1834 45 141 

CAUCHY-RIEMANN EQUATIONS N 40 89 8 17 

CAULKING N 7 0 7 3 

CAUSES N 94 43 30 29 

CAUSTIC LINES N 9 46 0 2 

CAUSTICS (OPTICS) N 22 220 1 5 

CAVES N 40 14 2 26 

CAVITATION CORROSION N 132 201 8 58 

CAVITATION FLOW N 830 1132 81 501 

CAVITIES N 1005 1442 22 595 

CAVITONS N 9 25 0 2 

CAVITY RESONATORS N 792 2936 22 468 

CAVITY VAPOR GENERATORS N 6 9 0 1 

CCD STAR TRACKER N 14 31 0 10 

CDC COMPUTERS N 265 40 10 195 

CDC CYBER 170 SERIES COMPUTERS N 25 1 0 5 

CDC CYBER 174 COMPUTER N 3 1 0 2 

CDC CYBER 175 COMPUTER N 15 3 2 2 

CDC CYBER 203 COMPUTER N 10 6 0 3 

CDC CYBER 205 COMPUTER N 26 32 0 3 

CDC CYBER 74 COMPUTER N 7 2 0 3 

CDC STAR 100 COMPUTER N 11 15 0 13 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CDC 160-A COMPUTER N 1 1 0 22 

CDC 1604 COMPUTER N 19 2 0 13 

CDC 3100 COMPUTER N 4 0 0 5 

CDC 3200 COMPUTER N 6 2 0 20 

CDC 3600 COMPUTER N 33 4 0 23 

CDC 3800 COMPUTER N 27 0 0 28 

CDC 6000 SERIES COMPUTERS N 44 4 2 68 

CDC 6400 COMPUTER N 22 6 0 32 

CDC 6600 COMPUTER N 233 31 2 128 

CDC 6700 COMPUTER N 11 2 0 2 

CDC 7000 SERIES COMPUTERS N 2 1 0 3 

CDC 7600 COMPUTER N 60 12 0 29 

CDC 8090 COMPUTER N 1 0 0 2 

CEDAR RAPIDS (IA) N 0 2 0 0 

CEFOAM CHECKOUT EQUIPMENT N 0 0 0 1 

CEILING (AIRCRAFT CAPABILITY) N 7 8 0 9 

CEILINGS N 3 1 0 2 

CEILINGS (ARCHITECTURE) N 28 12 5 22 

CEILINGS (METEOROLOGY) N 484 56 1 122 

CELESCOPES N 16 13 0 5 

CELESTIAL BOD! ES N 280 466 109 701 

CELESTIAL GEODESY N 95 765 17 97 

CELESTIAL MECHANICS N 541 3076 237 330 

CELESTIAL NAVIGATION N 108 123 35 158 

CELESTIAL REFERENCE SYSTEMS N 108 242 31 56 

CELESTIAL SPHERE N 46 149 9 26 

CELL ANODES N 90 242 2 78 

CELL CATHODES N 107 291 2 88 

CELL DIVISION N 86 105 27 64 

CELL MEMBRANES (BIOLOGY) N 92 125 26 25 

CELLOPHANE N 11 4 2 3 

CELLS N 42 73 11 175 

CELLS (BIOLOGY) N 1191 1450 679 1212 

CELLULOSE N 303 172 57 230 

CELLULOSE NITRATE N 117 113 1 205 

CEMENTATION N 35 53 1 19 

CEMENTITE N 25 37 1 9 

CEMENTS N 282 89 88 303 

CENOZOIC ERA N 0 2 0 0 

CENSORED DATA (MATHEMATICS) N 108 57 2 17 

CENSUS N 38 24 89 39 

CENTAUR LAUNCH VEHICLE N 151 145 1 449 

CENTAUR PROJECT N 9 13 0 117 

CENTAURUS CONSTELLATION N 52 174 1 14 

CENTER OF GRAVITY N 306 1014 14 353 

CENTER OF MASS N 102 456 0 41 

CENTER OF PRESSURE N 39 38 0 39 

CENTERBOD I ES N 13 44 0 17 

CENTERS N 6 26 2 7 

CENTIMETER WAVES N 35 1603 3 16 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CENTRAL AFRICAN REPUBLIC N 8 2 0 1 

CENTRAL AMERICA N 63 39 37 35 

CENTRAL ATLANTIC REGION (US) N 38 3 3 3 

CENTRAL ATLANTIC REGIONAL ECOL TEST SITE N 22 4 0 0 

CENTRAL ELECTRONIC MANAGEMENT SYSTEM N 11 69 0 4 

CENTRAL EUROPE N 29 64 3 33 

CENTRAL NERVOUS SYSTEM N 344 603 106 273 

CENTRAL NERVOUS SYSTEM DEPRESSANTS N 22 18 2 23 

CENTRAL NERVOUS SYSTEM STIMULANTS N 15 35 5 7 

CENTRAL PIEDMONT (US) N 1 2 0 2 

CENTRAL PROCESSING UNITS N 754 726 52 469 

CENTRIFUGAL CASTING N 26 20 0 13 

CENTRIFUGAL COMPRESSORS N 276 646 25 170 

CENTRIFUGAL FORCE N 289 811 11 168 

CENTRIFUGAL PUMPS N 193 332 35 120 

CENTRIFUGES N 257 167 20 254 

CENTRIFUGING N 114 75 1 1 97 

CENTRIFUGING STRESS N 83 359 1 35 

CENTRIPETAL FORCE N 20 54 0 7 

CENTROIDS N 42 93 5 20 

CEPHALOPODS N 3 4 8 2 

CEPHEID VARIABLES N 138 1509 14 73 

CEPHEUS CONSTELLATION N 24 52 0 9 

CEPSTRA N 4 4 0 0 

CEPSTRAL ANALYSIS N 36 52 0 12 

CERAMIC BONDING N 92 263 6 71 

CERAMIC COATINGS N 295 778 12 285 

CERAMIC FIBERS N 74 532 1 42 

CERAMIC HONEYCOMBS N 5 3 0 7 

CERAMIC MATRIX COMPOSITES N 177 961 2 177 

CERAMIC NUCLEAR FUELS N 212 6 3 162 

CERAMICS N 3966 4270 399 3498 1

CEREBELLUM N 43 114 13 29 

CEREBRAL CORTEX N 228 949 38 107 

CEREBRAL VASCULAR ACCIDENTS N 8 45 11 3 

CEREBRAL VENTRICLES N 5 5 0 1 

CEREBROSPINAL FLUID N 22 73 7 22 

CEREBRUM N 72 162 11 51 

CERENKOV COUNTERS N 269 542 2 97 

CERENKDV RADIATION N 297 997 5 94 

CERES ASTEROID N 10 86 2 4 

CERESIN N 0 0 0 8 

CERIUM N 185 177 3 59 

CERIUM COMPOUNDS N 85 81 0 26 

CERIUM ISOTOPES N 20 7 0 11 

CERIUM OXIDES N 61 96 0 21 

CERIUM 137 N 2 1 0 1 

CERIUM 144 N 7 1 0 6 

CERMETS N 231 842 15 249 

CERTIFICATION N 327 571 23 143 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CESIUM N 540 535 11 371 

CESIUM ALLOYS N 12 13 0 6 

CESIUM ANTIMONIDES N 1 5 0 1 

CESIUM BROMIDES N 5 7 0 2 

CESIUM COMPOUNDS N 82 58 0 66 

CESIUM DIODES N 47 85 0 20 

CESIUM ENGINES N 42 66 0 31 

CESIUM FLUORIDES N 18 13 1 8 

CESIUM HALIDES N 9 18 0 3 

CESIUM HYDRIDES N 0 4 0 0 

CESIUM IODIDES N 42 81 1 36 

CESIUM IONS N 49 130 0 25 

CESIUM ISOTOPES N 50 8 0 17 

CESIUM OXIDES N 18 41 0 18 

CESIUM PLASMA N 114 561 3 49 

CESIUM VAPOR N 63 412 2 53 

CESIUM 133 N 9 19 0 4 

CESIUM 134 N 11 0 0 2 

CESIUM 137 N 141 27 2 50 

CESIUM 144 N 5 0 0 0 

CESSNA AIRCRAFT N 48 63 1 49 

CESSNA L-19 AIRCRAFT N 1 0 0 1 

CESSNA 172 AIRCRAFT N 8 7 0 6 

CESSNA 205 AIRCRAFT N 1 0 0 2 

CESSNA 210 AIRCRAFT N 5 4 0 2 

CESSNA 402B AIRCRAFT N 4 3 0 4 

CETANE N 18 10 1 18 

CETYL COMPOUNDS N 2 3 0 5 

CF-700 ENGINE N 1 0 0 0 

CH-21 HELICOPTER N 0 1 0 3 

CH-3 HELICOPTER N 5 6 0 5 

CH-34 HELICOPTER N 2 4 0 7 

CH-46 HELICOPTER N 14 30 0 50 

CH-47 HELICOPTER N 121 109 1 1 11 

CH-54 HELICOPTER N 34 19 0 19 

CH-62 HELICOPTER N 0 6 0 0 

CHAD N 9 11 0 1 

CHAFF N 47 75 0 345 

CHAINS N 80 40 6 104 

CHALCOGENIDES N 240 332 18 134 

CHALK N 7 6 1 7 

CHALLENGER (ORBITER) N 55 81 11 152 

CHAMBERS N 18 31 1 52 

CHANCE-VOUGHT AIRCRAFT N 0 0 0 3 

CHANORASEKHAR EQUATION N 32 149 0 9 

CHANGE DETECTION N 41 144 0 18 

CHANNEL CAPACITY N 229 1675 3 82 

CHANNEL FLOW N 871 4603 52 345 

CHANNEL MULTIPLIERS N 61 86 6 21 

CHANNEL NOISE N 91 363 0 33 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM •*•**** TYPE STAR IAA NLN OTHER 

CHANNEL WINGS N 2 1 0 3 

CHANNELS N 222 128 4 123 

CHANNELS (DATA TRANSMISSION) N 1066 3240 40 544 

CHAOS N 197 1320 19 32 

CHAPARRAL N 4 9 0 0 

CHAPARRAL MISSILE N 3 1 0 80 

CHAPLYGIN EQUATION N 12 155 1 10 

CHAPMAN-ENSKOG THEORY N 66 425 2 30 

CHAPMAN-FERRARO PROBLEM N 4 30 0 6 

CHARACTER RECOGNITION N 236 133 25 139 

CHARACTERISTICS N 40 12 10 75 

CHARACTERIZATION N 838 63 38 481 

CHARCOAL N 109 53 4 96 

CHARGE CARRIERS N 587 1345 23 253 

CHARGE COUPLED DEVICES N 821 3031 44 750 

CHARGE DISTRIBUTION N 568 1081 23 184 

CHARGE EFFICIENCY N 151 136 2 51 

CHARGE EXCHANGE N 560 748 11 167 

CHARGE FLOW DEVICES N 15 9 0 4 

CHARGE INJECTION DEVICES N 42 144 0 18 

CHARGE TRANSFER N 845 1222 59 391 

CHARGE TRANSFER DEVICES N 79 214 13 73 

CHARGED PARTICLES N 2631 3819 110 1460 

CHARGING N 53 95 2 23 

CHARM (PARTICLE PHYSICS) N 80 25 2 40 

CHARON N 19 76 0 5 

CHARPY IMPACT TEST N 280 305 4 120 

CHARRING N 91 86 5 119 

CHARTS N 355 145 173 329 

CHASSIS N 34 26 3 60 

CHEBYSHEV APPROXIMATION N 368 947 24 123 

CHECKOUT N 697 325 56 1653 

CHELATES N 179 35 15 117 

CHELATION N 61 7 6 35 

CHEMICAL ANALYSIS N 4171 1762 1055 2983 

CHEMICAL ATTACK N 336 415 12 204 

CHEMICAL AUXILIARY POWER UNITS N 23 14 1 15 

CHEMICAL BONDS N 1361 1175 306 643 

CHEMICAL CLEANING N 107 71 5 83 

CHEMICAL CLOUDS N 37 17 0 23 

CHEMICAL COMPOSITION N 3674 8107 296 2390 1

CHEMICAL COMPOUNDS N 197 67 129 217 

CHEMICAL DEFENSE N 23 15 3 176 

CHEMICAL EFFECTS N 124 333 26 78 

CHEMICAL ELEMENTS N 306 237 171 275 

CHEMICAL ENERGY N 137 341 20 123 

CHEMICAL ENGINEERING N 506 265 566 487 

CHEMICAL EQUILIBRIUM N 748 1003 151 367 

CHEMICAL EVOLUTION N 95 1396 41 126 

CHEMICAL EXPLOSIONS N 228 175 13 101 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**,.,*-+:** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CHEMICAL FRACTIONATION N 63 296 10 38 

CHEMICAL FUELS N 65 44 9 102 

CHEMICAL INDICATORS N 29 12 6 29 

CHEMICAL LASERS N 665 1377 37 988 

CHEMICAL MACHINING N 55 69 9 104 

CHEMICAL PROPERTIES N 1739 1012 544 1840 

CHEMICAL PROPULSION N 181 257 16 356 

CHEMICAL REACTION CONTROL N 78 107 10 51 

CHEMICAL REACTIONS N 6203 5054 1353 4632 1

CHEMICAL REACTORS N 590 370 62 417 

CHEMICAL RELEASE MODULES N 6 17 0 5 

CHEMICAL STERILIZATION N 39 32 3 30 

CHEMICAL TESTS N 83 69 95 97 

CHEMICAL WARFARE N 102 18 14 534 

CHEMICALS N 38 19 63 38 

CHEMILUMINESCENCE N 476 542 33 328 

CHEMISORPTION N 538 506 44 251 

CHEMISTRY N 180 58 869 386 

CHEMORECEPTORS N 34 279 12 22 

CHEMOSPHERE N 4 6 2 4 

CHEMOTHERAPY N 121 211 100 203 

CHENA RIVER BASIN (AK) N 8 2 0 0 

CHESAPEAKE BAY (US) N 214 47 45 134 

CHEST N 18 49 4 7 

CHIASMS N 1 3 0 0 

CHICKENS N 32 86 4 61 

CHILD DEVICE N 4 0 0 1 

CHILD-LANGMUIR LAW N 13 17 0 1 

CHILDREN N 83 76 102 49 

CHILE N 69 105 12 36 

CHIMNEYS N 71 34 6 45 

CHIMPANZEES N 16 27 9 23 

CHIN N 0 1 0 0 

CHINA N 309 326 65 257 

CHINESE AIRCRAFT N 0 5 0 0 

CHINESE SPACE PROGRAM N 24 91 1 32 

CHINESE SPACECRAFT N 9 49 0 15 

CHIPPING N 24 19 0 17 

CHIPS N 83 191 7 93 

CHIPS (ELECTRONICS) N 736 774 19 828 

CHIPS (MEMORY DEVICES) N 117 206 11 128 

CHIRAL DYNAMICS N 142 104 11 45 

CHI RON N 2 18 0 0 

CHIRONOMUS FLIES N 2 0 0 4 

CHIRP N 49 131 0 22 

CHIRP SIGNALS N 53 277 0 45 

CHITIN N 8 2 0 7 

CHLORAL N 0 4 0 2 

CHLORATES N 29 34 0 28 

CHLORELLA N 72 124 2 30 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CHLORIDES N 762 609 17 519 

CHLORINATION N 157 60 21 106 

CHLORINE N 502 578 19 317 

CHLORINE COMPOUNDS N 286 236 11 277 

CHLORINE FLUORIDES N 54 53 2 141 

CHLORINE OXIDES N 34 174 5 27 

CHLOROAROMATICS N 32 5 3 9 

CHLOROBENZENES N 29 21 0 14 

CHLOROCARBONS N 80 198 2 48 

CHLOROETHYLENE N 26 31 0 21 

CHLOROFLUOROMETHANE N 61 245 0 6 

CHLOROFORM N 64 58 2 58 

CHLOROFORMATE N 0 2 1 2 

CHLOROPHYLLS N 413 452 24 244 

CHLOROPLASTS N 65 72 17 47 

CHLOROPRENE RESINS N 78 27 2 89 

CHLOROSILANES N 41 17 0 14 

CHLORPROMAZINE N 9 6 0 1 

CHOKES N 22 29 1 12 

CHOKES (FUEL SYSTEMS) N 9 13 0 6 

CHOKES (RESTRICTIONS) N 52 75 1 30 

CHOLERA N 2 5 0 7 

CHOLESKY FACTORIZATION N 61 73 0 11 

CHOLESTEROL N 136 200 12 57 

CHOLINE N 35 62 6 74 

CHOLINERGICS N 22 75 8 19 

CHOLINESTERASE N 74 35 4 147 

CHONDRITES N 171 1615 5 115 

CHONDRULE N 38 381 2 22 

CHORDS (GEOMETRY) N 98 127 0 63 

CHOROID MEMBRANES N 8 12 1 2 

CHROMATES N 116 77 2 94 

CHROMATOGRAPHY N 544 311 219 479 

CHROMIC ACID N 35 43 2 18 

CHROMITES N 25 129 3 17 

CHROMIUM N 1159 1084 39 592 

CHROMIUM ALLOYS N 1024 2374 21 537 

CHROMIUM BORIDES N 3 27 0 1 

CHROMIUM BROMIDES N 2 4 0 0 

CHROMIUM CARBIDES N 48 145 2 7 

CHROMIUM COMPOUNDS N 186 171 5 102 

CHROMIUM FLUORIDES N 3 1 0 0 

CHROMIUM ISOTOPES N 38 39 0 13 

CHROMIUM OXIDES N 156 272 0 76 

CHROMIUM STEELS N 334 1439 11 121 

CHROMOSOMES N 166 181 60 120 

CHROMOSPHERE N 556 3168 18 260 

CHRONAXY N 0 3 0 0 

CHRONIC CONDITIONS N 22 309 8 13 

CHRONOLOGY N 250 636 56 112 
NASA COMBINED FILE POSTING STATISTICS 

910117 

'*'****** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CHRONOMETERS N 53 99 4 38 

CHRONOPHOTOGRAPHY N 63 95 3 17 

CHUKCHI SEA N 28 7 2 28 

CHUTES N 14 13 2 3 

CINEMATOGRAPHY N 128 395 60 100 

CINESPECTROGRAPHS N 6 1 0 19 

CINETHEODOLITES N 60 21 0 40 

CIRCADIAN RHYTHMS N 349 752 53 201 

CIRCLES (GEOMETRY) N 169 173 19 114 

CIRCUIT BOARDS N 385 306 35 485 

CIRCUIT BREAKERS N 179 70 32 250 

CIRCUIT DIAGRAMS N 1079 2839 136 1073 

CIRCUIT PROTECTION N 414 536 44 364 

CIRCUIT RELIABILITY N 576 1691 40 870 

CIRCUITS N 1829 362 1005 2342 

CIRCULAR CONES N 84 193 1 39 

CIRCULAR CYLINDERS N 871 4395 16 311 

CIRCULAR ORBITS N 269 1665 5 191 

CIRCULAR PLATES N 179 1919 13 82 

CIRCULAR POLARIZATION N 242 2577 1 105 

CIRCULAR SHELLS N 122 559 1 46 

CIRCULAR TUBES N 204 732 1 81 

CIRCULAR WAVEGUIDES N 32 234 0 3 

CIRCULATION N 290 134 30 224 

CIRCULATION CONTROL AIRFOILS N 53 99 0 28 

CIRCULATION CONTROL ROTORS N 14 34 0 15 

CIRCULATION DISTRIBUTION N 15 68 1 13 

CIRCULATORS (PHASE SHIFT CIRCUITS) N 54 281 3 64 

CIRCULATORY SYSTEM N 143 177 47 87 

CIRCUMFERENCES N 28 53 1 6 

CIRCUMLUNAR COMMUNICATION N 5 2 0 1 

CIRCUMLUNAR TRAJECTORIES N 11 28 0 18 

CIRCUMPOLAR WESTERLIES N 17 21 0 5 

CIRCUMSOLAR RADIATION N 14 11 0 2 

CIRCUMSOLAR TELESCOPES N 2 1 0 0 

CIRQUES (LANDFORMS) N 2 0 1 1 

CIRROCUMULUS CLOUDS N 1 4 0 0 

CIRROSTRATUS CLOUDS N 6 18 0 0 

CIRRUS CLOUDS N 197 320 0 84 

CIRRUS SHIELDS N 1 0 0 2 

CISLUNAR SPACE N 24 80 5 24 

CITIES N 1226 756 311 873 

CITRATES N 17 12 1 10 

CITRIC ACID N 19 12 3 10 

CITRUS TREES N 30 22 2 7 

CIVIL AVIATION N 1591 2919 347 1048 

CIVIL DEFENSE N 57 9 22 80 

CL-41 AIRCRAFT N 3 1 0 1 

CL-44 AIRCRAFT N 0 0 0 1 

CL-600 CHALLENGER AIRCRAFT N 1 1 0 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CL-823 AIRCRAFT N 0 0 0 3 

CL-84 AIRCRAFT N 6 13 0 5 

CLADDING N 805 455 14 636 

CLAIMING N 4 21 7 8 

CLAMPING CIRCUITS N 4 2 1 9 

CLAMPS N 150 342 3 199 

CLARITY N 13 12 0 12 

CLASSES N 34 11 13 14 

CLASSICAL MECHANICS N 258 577 174 89 

CLASSIFICATIONS N 2093 2836 240 1010 

CLASSIFIERS N 67 51 2 31 

CLASSIFYING N 152 345 9 101 

CLATHRATES N 47 42 9 13 

CLAYS N 380 185 71 283 

CLEAN ENERGY N 138 1121 51 112 

CLEAN FUELS N 27 34 2 19 

CLEAN ROOMS N 103 92 23 91 

CLEANERS N 44 9 2 55 

CLEANING N 407 165 50 426 

CLEANLINESS N 86 94 8 60 

CLEAR AIR TURBULENCE N 297 560 18 178 

CLEARANCES N 200 242 0 101 

CLEARING N 12 6 0 7 

CLEARINGS (OPENINGS) N 5 4 1 4 

CLEAVAGE N 178 296 13 89 

CLEBSCH-GORDAN COEFFICIENTS N 35 26 1 13 

CLIFFS N 18 8 0 10 

CLIMATE N 1842 424 263 1095 

CLIMATE CHANGE N 512 615 0 103 

CLIMATOLOGY N 3796 3106 484 1932 

CLIMBING FLIGHT N 159 292 7 102 

CLINICAL MEDICINE N 1125 2021 807 860 

CLIPPER CIRCUITS N 12 20 2 33 

CLIPS N 5 2 0 19 

CLOCK PARADOX N 10 47 1 5 

CLOCKS N 358 332 13 272 

CLOSE PACKED LATTICES N 29 1404 2 13 

CLOSED CIRCUIT TELEVISION N 112 72 24 128 

CLOSED CYCLES N 288 419 16 205 

CLOSED ECOLOGICAL SYSTEMS N 557 522 24 241 

CLOSING N 11 15 0 8 

CLOSTRIDIUM N 14 26 0 4 

CLOSTRIDIUM BOTULINUM N 3 0 1 14 

CLOSURE LAW N 125 327 1 20 

CLOSURES N 116 56 1 116 

CLOTHING N 114 61 17 213 

CLOTTING N 11 17 5 13 

CLOUD CHAMBERS N 115 137 7 69 

CLOUD COVER N 1620 2934 29 973 

CLOUD DISPERSAL N 46 67 2 41 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CLOUD GLACIATION N 139 300 4 45 

CLOUD HEIGHT INDICATORS N 153 175 2 47 

CLOUD PHOTOGRAPHS N 101 248 4 57 

CLOUD PHOTOGRAPHY N 325 451 8 226 

CLOUD PHYSICS N 1293 2645 83 530 

CLOUD SEEDING N 602 254 16 248 

CLOUDS N 622 441 41 448 

CLOUDS (METEOROLOGY) N 1606 1672 72 903 

CLUMPS N 470 218 18 256 

CLUSTER ANALYSIS N 180 231 7 45 

CLUSTER MISSION N 25 6 0 2 

CLUSTERS N 22 26 0 5 

CLUTCHES N 47 50 12 55 

CLUTTER N 476 1182 5 591 

CMOS N 349 671 12 291 

CN EMISSION N 11 119 0 3 

CNOIDAL WAVES N 10 22 0 1 

COACHELLA VALLEY (CA) N 6 1 1 1 

COAGULATION N 130 231 16 107 

COAL N 1659 200 337 1593 

COAL DERIVED GASES N 77 9 0 52 

COAL DERIVED LIQUIDS N 211 37 5 171 

COAL GASIFICATION N 1223 713 70 1169 

COAL LIQUEFACTION N 699 353 43 745 

COAL UTILIZATION N 1110 1178 91 889 

COALESCING N 166 259 4 84 

COANDA EFFECT N 126 152 1 76 

COARSENESS N 46 77 1 16 

COASTAL CURRENTS N 178 182 20 94 

COASTAL ECOLOGY N 332 126 95 298 

COASTAL PLAINS N 162 66 34 179 

COASTAL RANGES (CA) N 16 4 5 4 

COASTAL WATER N 682 617 48 393 

COASTAL ZONE COLOR SCANNER N 75 201 2 53 

COASTING FLIGHT N 31 35 3 36 

COASTS N 988 371 147 566 

COATING N 234 69 32 287 

COATINGS N 1558 727 182 2119 

COAXIAL CABLES N 412 556 19 475 

COAXIAL FLOW N 158 372 0 68 

COAXIAL NOZZLES N 12 25 0 5 

COAXIAL PLASMA ACCELERATORS N 93 221 1 25 

COBALT N 723 559 32 447 

COBALT ACETATES N 1 0 0 0 

COBALT ALLOYS N 619 1671 24 397 

COBALT COMPOUNDS N 219 175 3 150 

COBALT FLUORIDES N 4 2 0 2 

COBALT ISOTOPES N 72 87 2 20 

COBALT OXALATES N 0 0 0 1 

COBALT OXIDES N 69 86 0 39 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

COBALT 58 N 6 2 0 0 

COBALT 60 N 210 196 2 98 

COBOL N 441 12 92 241 

COBRA DANE (RADAR) N 1 1 0 47 

COCCOMYCES N 0 1 0 1 

COCHLEA N 68 130 6 24 

COCKPIT SIMULATORS N 167 292 0 97 

COCKPITS N 929 1313 19 749 

COCKROACHES N 2 2 2 5 

COCKS N 7 1 1 4 

CODE DIVISION MULTIPLE ACCESS N 28 96 0 7 

CODE DIVISION MULTIPLEXING N 9 15 0 3 

CODERS N 244 215 7 199 

CODES N 166 319 77 131 

COOING N 3123 981 275 2128 

COEFFICIENT OF FRICTION N 607 1445 5 249 

COEFFICIENTS N 1271 682 56 775 

COENZYMES N 12 19 10 7 

COERCIVITY N 75 142 1 41 

COESITE N 5 17 0 2 

COFFEE N 15 7 0 3 

COFFIN-MANSON LAW N 5 36 0 1 

COGENERATION N 213 45 9 122 

COGNITION N 625 131 165 284 

COGNITIVE PSYCHOLOGY N 151 187 63 48 

COGO (PROGRAMMING LANGUAGE) N 0 0 1 2 

COHENITE N 0 12 0 1 

COHERENCE N 104 342 12 46 

COHERENCE COEFFICIENT N 71 98 1 24 

COHERENT ACOUSTIC RADIATION N 45 54 2 22 

COHERENT ELECTROMAGNETIC RADIATION N 152 454 14 95 

COHERENT LIGHT N 362 2336 74 240 

COHERENT RADAR N 195 474 9 246 

COHERENT RADIATION N 855 1078 33 468 

COHERENT SCATTERING N 258 332 4 96 

COHESION N 129 148 9 83 

COILS N 71 69 3 134 

COIN AIRCRAFT N 1 2 0 6 

COINCIDENCE CIRCUITS N 132 96 3 60 

COINING N 3 7 0 1 

COKE N 104 67 15 95 

COLCHICINE N 6 0 0 3 

COLO ACCLIMATIZATION N 75 324 16 39 

COLD BOKKEVELD METEORITE N 0 6 0 0 

COLD CATHODE TUBES N 69 30 5 100 

COLD CATHODES N 56 128 3 51 

COLD DRAWING N 35 28 0 10 

COLD FLOW TESTS N 159 189 0 360 

COLD FRONTS N 128 261 0 28 

COLD GAS N 76 223 0 53 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM **"'•*** TYPE STAR IAA NLN OTHER 

COLD HARDENING N 22 43 0 21 

COLD NEUTRONS N 41 15 0 19 

COLD PLASMAS N 296 2558 17 94 

COLD PRESSING N 60 107 0 25 

COLD ROLLING N 106 370 8 58 

COLD STRENGTH N 16 178 2 37 

COLD SURFACES N 54 69 0 65 

COLD TOLERANCE N 118 170 11 63 

COLD TRAPS N 40 19 0 30 

COLD WATER N 101 146 3 104 

COLD WEATHER N 194 104 12 183 

COLD WEATHER TESTS N 117 31 1 309 

COLD WELDING N 16 23 3 24 

COLD WORKING N 482 738 32 268 

COLEOPTERA N 2 3 2 2 

COLIC N 0 1 0 0 

COLLAGENS N 39 61 22 29 

COLLAPSE N 207 259 6 114 

COLLATING N 11 5 0 8 

COLLECTION N 131 30 63 178 

COLLIMATION N 237 801 2 131 

COLLIMATORS N 281 565 4 248 

COLLINEARITY N 72 167 3 17 

COLLISION AVOIDANCE N 704 839 38 316 

COLLISION PARAMETERS N 547 1118 14 176 

COLLISION RATES N 135 952 1 47 

COLLISIONAL PLASMAS N 235 1414 10 61 

COLLISIONLESS PLASMAS N 624 2491 15 142 

COLLISIONS N 507 392 71 287 

COLLOCATION N 220 496 7 62 

COLLOIDAL GENERATORS N 30 12 0 4 

COLLOIDAL PROPELLANTS N 32 72 2 34 

COLLOIDING N 28 12 4 10 

COLLOIDS N 269 150 104 203 

COLOMBIA N 23 17 4 30 

COLONIES N 28 29 7 17 

COLOR N 1116 1048 153 762 

COLOR CENTERS N 172 207 14 111 

COLOR CODING N 102 120 3 33 

COLOR INFRARED PHOTOGRAPHY N 76 189 0 4 

COLOR PHOTOGRAPHY N 621 1205 68 303 

COLOR TELEVISION N 266 236 32 132 

COLOR VISION N 265 595 35 93 

COLOR-COLOR DIAGRAM N 32 224 0 0 

COLOR-MAGNITUDE DIAGRAM N 28 736 0 3 

COLORADO N 607 324 111 370 

COLORADO PLATEAU (US) N 49 8 6 9 

COLORADO RIVER (NORTH AMERICA) N 35 6 4 36 

COLORIMETRY N 220 566 78 151 

COLUMBIA (ORBITER) N 52 80 3 131 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

COLUMBIA RIVER BASIN (ID-OR-WA) N 32 16 4 46 

COLUMBUS SPACE STATION N 198 335 0 36 

COLUMNS N 15 25 2 9 

COLUMNS (PROCESS ENGINEERING) N 197 32 25 113 

COLUMNS (SUPPORTS) N 247 415 52 104 

COMA N 19 247 2 8 

COMBAT N 520 644 69 1210 

COMBINATION N 6 7 0 3 

COMBINATIONS (MATHEMATICS) N 155 32 15 42 

COMBINATORIAL ANALYSIS N 432 165 118 214 

COMBINED CYCLE POWER GENERATION N 85 24 1 42 

COMBINED STRESS N 60 1272 3 13 

COMBUSTIBLE FLOW N 241 1629 8 106 

COMBUSTION N 1766 220 270 1699 

COMBUSTION CHAMBERS N 2536 3894 57 3272 

COMBUSTION CHEMISTRY N 110 331 4 37 

COMBUSTION CONTROL N 170 390 9 189 

COMBUSTION EFFICIENCY N 1018 1005 29 990 

COMBUSTION PHYSICS N 1315 2958 121 1383 

COMBUSTION PRODUCTS N 2054 2538 98 1615 

COMBUSTION STABILITY N 768 1353 19 1136 

COMBUSTION TEMPERATURE N 165 455 6 117 

COMBUSTION VIBRATION N 28 245 1 48 

COMBUSTION WIND TUNNELS N 10 31 0 5 

COMET HEADS N 58 251 1 19 

COMET NUCLEI N 420 1125 2 84 

COMET RENDEZVOUS ASTEROID FLYBY MISSION N 17 67 0 15 

COMET TAILS N 177 607 1 87 

COMET 4 AIRCRAFT N 7 7 0 4 

COMETARY ATMOSPHERES N 279 574 2 95 

COMETARY MAGNETOSPHERES N 19 60 0 9 

COMETS N 784 2640 147 638 

COMFORT N 236 187 6 94 

COMMAND AND CONTROL N 1294 1010 60 3415 

COMMAND GUIDANCE N 96 155 6 261 

COMMAND LANGUAGES N 66 31 2 14 

COMMAND MODULES N 148 102 1 665 

COMMAND SERVICE MODULES N 94 42 2 632 

COMMANDS N 5 21 0 4 

COMMERCE N 446 107 763 547 

COMMERCE LAB N 1 4 0 1 

COMMERCIAL AIRCRAFT N 972 1652 220 609 

COMMERCIAL ENERGY N 406 360 22 265 

COMMERCIAL SPACECRAFT N 24 314 1 44 

COMMINUTION N 51 42 5 44 

COMMITTEE ON SPACE RESEARCH N 69 358 22 16 

COMMODITIES N 46 8 17 58 

COMMONALITY N 46 40 0 27 

COMMUNICATING N 326 91 197 266 

COMMUNICATION B 642 93 581 891 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******• TYPE STAR IAA NLN OTHER 

COMMUNICATION CABLES N 315 231 37 322 

COMMUNICATION EQUIPMENT N 1049 914 155 2032 

COMMUNICATION NETWORKS N 1733 1792 128 1576 

COMMUNICATION SATELLITES N 2130 6352 289 2549 1

COMMUNICATION THEORY N 577 1948 241 381 

COMMUNICATIONS TECHNOLOGY SATELLITE N 107 178 10 58 

COMMUNITIES N 277 154 104 288 

COMMUTATION N 199 220 15 135 

COMMUTATORS N 203 156 13 263 

COMMUTER AIRCRAFT N 124 158 0 38 

COMPACT GALAXIES N 15 247 0 2 

COMPACTING N 338 322 18 247 

COMPANDING N 11 36 0 2 

COMPANION STARS N 54 870 9 27 

COMPARATOR CIRCUITS N 52 101 10 46 

COMPARATORS N 160 163 5 189 

COMPARISON N 2396 479 22 1080 

COMPARTMENTS N 55 30 4 82 

COMPASS (PROGRAMMING LANGUAGE) N 3 2 1 11 

COMPASSES N 20 19 6 40 

COMPATIBILITY N 596 305 27 1189 

COMPENSATION N 46 263 14 27 

COMPENSATORS N 246 690 6 130 

COMPENSATORY TRACKING N 153 189 1 20 

COMPETITION N 125 153 75 231 

COMPILERS N 1594 374 96 623 

COMPLEMENT N 3 0 0 0 

COMPLEMENT (BIOLOGY) N 1 6 3 1 

COMPLEMENTS {MATHEMATICS) N 29 26 2 13 

COMPLETENESS N 59 29 1 5 

COMPLEX COMPOUNDS N 188 31 18 67 

COMPLEX NUMBERS N 84 174 56 56 

COMPLEX SYSTEMS N 233 2526 68 108 

COMPLEX VARIABLES N 395 1388 262 194 

COMPLEXITY N 179 62 27 51 

COMPONENT RELIABILITY N 1428 2947 68 3975 

COMPONENTS N 153 151 32 259 

COMPOSITE FUNCTIONS N 28 21 0 6 

COMPOSITE MATERIALS N 5361 6886 526 7186 1

COMPOSITE PROPELLANTS N 314 722 1 849 

COMPOSITE STRUCTURES N 1414 4306 77 1751 

COMPOSITE WRAPPING N 28 193 0 88 

COMPOSITION N 20 17 13 46 

COMPOSITION (PROPERTY) N 416 146 15 479 

COMPO STING N 7 10 2 7 

COMPOUND A N 1 0 0 6 

COMPOUND HELICOPTERS N 11 43 1 11 

COMPOUNDING N 26 22 9 20 

COMPOUNDS N 18 4 12 50 

COMPRESSED AIR N 298 204 24 191 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

COMPRESSED GAS N 127 344 23 80 

COMPRESSIBILITY N 546 407 32 363 

COMPRESSIBILITY EFFECTS N 201 771 3 90 

COMPRESSIBLE BOUNDARY LAYER N 236 635 4 61 

COMPRESSIBLE FLOW N 1568 3229 98 591 

COMPRESSIBLE FLUIDS N 233 1165 23 105 

COMPRESSING N 438 301 11 309 

COMPRESSION LOADS N 752 3231 13 378 

COMPRESSION RATIO N 58 41 0 32 

COMPRESSION TESTS N 455 1142 11 290 

COMPRESSION WAVES N 143 618 2 64 

COMPRESSIVE STRENGTH N 634 820 10 449 

COMPRESSOR BLADES N 575 975 6 309 

COMPRESSOR EFFICIENCY N 183 362 3 77 

COMPRESSOR ROTORS N 331 380 4 166 

COMPRESSORS N 718 482 81 818 

COMPTON EFFECT N 539 1573 9 209 

COMPULSATORS N 0 19 0 1 

COMPUTATION N 4708 413 412 2923 

COMPUTATIONAL ASTROPHYSICS N 21 3544 0 7 

COMPUTATIONAL CHEMISTRY N 37 370 3 40 

COMPUTATIONAL FLUID DYNAMICS N 3422 16032 115 1119 2

COMPUTATIONAL GEOMETRY N 59 94 0 5 

COMPUTATIONAL GRIDS N 1506 4263 8 256 

COMPUTER AIDED DESIGN N 4203 7154 438 2462 1

COMPUTER AIDED MANUFACTURING N 508 572 58 738 

COMPUTER AIDED MAPPING N 279 255 2 27 

COMPUTER AIDED TOMOGRAPHY N 80 137 1 70 

COMPUTER ANIMATION N 40 41 1 10 

COMPUTER ASSISTED INSTRUCTION N 487 85 78 236 

COMPUTER COMPATIBLE TAPES N 182 41 0 23 

COMPUTER COMPONENTS N 528 448 108 473 

COMPUTER DESIGN N 966 1301 318 734 

COMPUTER GRAPHICS N 4802 2789 419 2160 1

COMPUTER INFORMATION SECURITY N 361 112 111 190 

COMPUTER NETWORKS N 2198 867 355 1034 

COMPUTER PROGRAM INTEGRITY N 350 147 14 119 

COMPUTER PROGRAMMING N 10344 2144 2424 6836 2

COMPUTER PROGRAMS N 29858 14742 1507 21173 6

COMPUTER STORAGE DEVICES N 2146 1615 262 2147 

COMPUTER SYSTEMS DESIGN N 2620 2241 320 1078 

COMPUTER SYSTEMS PERFORMANCE N 1277 533 57 395 

COMPUTER SYSTEMS PROGRAMS N 2979 1110 334 1403 

COMPUTER SYSTEMS SIMULATION N 165 116 7 125 

COMPUTER TECHNIQUES N 6193 11004 1159 4001 2

COMPUTER VIRUSES N 6 7 0 1 

COMPUTER VISION N 553 823 49 143 

COMPUTERIZED SIMULATION N 15951 17350 584 9853 4

COMPUTERS N 2283 257 1501 3102 

COMSAT PROGRAM N 24 132 13 35 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

COMSTAR C N 1 8 0 0 

COMSTAR SATELLITES N 11 49 0 4 

CONCATENATED CODES N 55 47 0 4 

CONCAVITY N 142 275 0 52 

CONCENTRATING N 48 26 6 27 

CONCENTRATION N 32 24 3 38 

CONCENTRATION (COMPOSITION) N 3010 1933 39 1765 

CONCENTRATORS N 491 1061 14 200 

CONCENTRIC CYLINDERS N 81 578 3 28 

CONCENTRIC SPHERES N 17 23 0 5 

CONCENTRICITY N 34 89 0 27 

CONCORDE AIRCRAFT N 161 507 11 60 

CONCRETE STRUCTURES N 189 36 35 131 

CONCRETES N 1227 183 223 1141 

CONCURRENT PROCESSING N 243 123 3 65 

CONDENSATES N 243 412 14 129 

CONDENSATION N 216 880 17 118 

CONDENSATION NUCLEI N 55 172 1 21 

CONDENSATION PUMPS N 15 12 0 7 

CONDENSED MATTER PHYSICS N 65 125 0 21 

CONDENSERS N 34 81 0 15 

CONDENSERS (LIQUEFIERS) N 213 122 12 155 

CONDENSING N 650 698 64 283 

CONDITIONED REFLEXES N 9 101 8 18 

CONDITIONING N 5 13 1 9 

CONDITIONING (LEARNING) N 141 263 22 69 

CONDITIONS N 122 54 15 244 

CONDOR MISSILE N 0 3 0 36 

CONDUCTING FLUIDS N 65 1782 4 21 

CONDUCTING POLYMERS N 17 11 0 3 

CONDUCTION N 38 33 11 37 

CONDUCTION BANDS N 219 519 10 87 

CONDUCTION ELECTRONS N 161 221 6 63 

CONDUCTIVE HEAT TRANSFER N 986 4606 99 454 

CONDUCTIVITY N 150 132 7 144 

CONDUCTIVITY METERS N 26 14 1 14 

CONDUCTORS N 250 360 25 177 

CONES N 229 426 12 204 

CONES (VOLCANOES) N 23 23 1 12 

CONFERENCES N 19564 54519 24346 11076 10

CONFIDENCE N 87 23 7 20 

CONFIDENCE LIMITS N 688 531 26 349 

CONFIGURATION INTERACTION N 83 314 3 42 

CONFIGURATION MANAGEMENT N 296 243 15 371 

CONFIGURATIONS N 160 93 6 174 

CONFINEMENT N 300 102 6 143 

CONFINING N 5 3 0 6 

CONFORMAL MAPPING N 605 1380 94 199 

CONFUSION N 4 6 2 3 

CONGENERS N 2 4 1 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CONGENITAL ANOMALIES N 15 63 18 2 

CONGESTION N 36 23 5 7 

CONGO (BRAZZAVILLE) N 3 5 1 0 

CONGRESSIONAL REPORTS N 1962 17 815 1223 

CONGRUENCES N 76 64 10 35 

CONICAL BODIES N 705 1161 6 624 

CONICAL CAMBER N 7 18 1 4 

CONICAL FLOW N 156 837 2 61 

CONICAL INLETS N 9 19 0 3 

CONICAL NOZZLES N 134 348 0 182 

CONICAL SCANNING N 55 88 1 41 

CONICAL SHELLS N 165 775 2 65 

CONICS N 53 101 13 52 

CONIFERS N 116 174 5 40 

CONJUGATE GRADIENT METHOD N 123 259 1 17 

CONJUGATE POINTS N 52 309 4 10 

CONJUGATED CIRCUITS N 0 2 0 1 

CONJUGATES N 171 326 18 63 

CONJUGATION N 40 88 3 13 

CONJUNCTION N 7 16 0 13 

CONJUNCTIVA N 6 10 0 1 

CONJUNCTIVITIS N 1 3 0 0 

CONNECTICUT N 85 19 8 87 

CONNECTIVE TISSUE N 22 25 19 28 

CONNECTORS N 242 117 18 329 

CONSCIOUSNESS N 49 59 33 31 

CONSECUTIVE EVENTS N 53 32 1 23 

CONSERVATION N 250 47 205 193 

CONSERVATION EQUATIONS N 405 1571 9 92 

CONSERVATION LAWS N 457 1431 52 122 

CONSISTENCY N 209 48 3 141 

CONSOLES N 142 65 3 187 

CONSOLIDATION N 64 91 9 64 

CONSONANTS (SPEECH) N 23 10 0 12 

CONSTANT N 3 9 2 1 

CONSTANTAN N 16 36 0 14 

CONSTANTS N 400 322 79 256 

CONSTELLATIONS N 39 70 16 30 

CONSTITUTION N 4 17 30 11 

CONSTITUTIVE EQUATIONS N 376 2440 16 82 

CONSTRAINTS N 1574 2496 56 1227 

CONSTRICTIONS N 49 72 3 36 

CONSTRICTORS N 2 11 0 2 

CONSTRUCTION N 1055 172 595 1412 

CONSTRUCTION INDUSTRY N 100 23 107 104 

CONSTRUCTION MATERIALS N 911 1154 292 715 

CONSULTING N 27 8 50 42 

CONSUMABLES (SPACECRAFT) N 5 14 0 18 

CONSUMABLES (SPACECREW SUPPLIES) N 86 28 4 50 

CONSUMERS N 129 39 82 129 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CONSUMPTION N 86 18 11 96 

CONTACT DERMATITIS N 6 3 2 3 

CONTACT LENSES N 18 40 2 15 

CONTACT LOADS N 38 182 0 7 

CONTACT POTENTIALS N 66 121 4 22 

CONTACT RESISTANCE N 175 531 11 98 

CONTACTORS N 32 26 1 11 

CONTACTS (GEOLOGY) N 16 10 2 14 

CONTAINERLESS MELTS N 173 173 1 161 

CONTAINERS N 174 153 19 259 

CONTAINMENT N 198 35 4 125 

CONTAMINANTS N 1370 483 131 999 

CONTAMINATION N 899 564 95 1042 

CONTENT N 31 9 12 18 

CONTEXT N 34 17 2 11 

CONTEXT FREE LANGUAGES N 69 16 2 31 

CONTINENTAL DRIFT N 68 168 39 42 

CONTINENTAL SHELVES N 610 186 75 534 

CONTINENTS N 123 237 31 46 

CONTINGENCY N 79 36 12 50 

CONTINUITY N 89 44 8 67 

CONTINUITY (MATHEMATICS) N 283 571 33 86 

CONTINUITY EQUATION N 281 1641 13 64 

CONTINUOUS NOISE N 10 19 3 3 

CONTINUOUS RADIATION N 478 2148 8 493 

CONTINUOUS SPECTRA N 107 1570 1 38 

CONTINUOUS WAVE LASERS N 461 3206 7 431 

CONTINUOUS WAVE RADAR N 114 327 6 177 

CONTINUUM FLOW N 133 251 6 53 

CONTINUUM MECHANICS N 677 2509 214 276 

CONTINUUM MODELING N 37 90 0 5 

CONTINUUMS N 237 91 16 93 

CONTOUR SENSORS N 44 76 1 14 

CONTOURS N 674 833 11 328 

CONTRACT INCENTIVES N 40 17 3 33 

CONTRACT MANAGEMENT N 314 155 76 331 

CONTRACT NEGOTIATION N 81 117 88 116 

CONTRACTION N 169 357 28 94 

CONTRACTORS N 232 103 40 536 

CONTRACTS N 354 142 312 1286 

CONTRAILS N 41 52 1 42 

CONTRALATERAL FUNCTIONS N 0 7 0 0 

CONTRAROTATING PROPELLERS N 25 64 0 15 

CONTRAST N 221 101 8 202 

CONTROL N 746 259 186 981 

CONTROL BOARDS N 206 128 12 290 

CONTROL CONFIGURED VEHICLES N 133 380 3 77 

CONTROL DATA (COMPUTERS) N 81 56 23 45 

CONTROL EQUIPMENT N 1160 1792 184 1476 

CONTROL MOMENT GYROSCOPES N 108 249 3 71 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CONTROL ROCKETS N 16 39 1 48 

CONTROL RODS N 373 19 3 172 

CONTROL SIMULATION N 452 1855 18 266 

CONTROL STABILITY N 615 2792 38 375 

CONTROL STICKS N 102 75 1 73 

CONTROL SURFACES N 775 707 23 918 

CONTROL SYSTEMS DESIGN N 1700 4072 27 452 

CONTROL THEORY N 3025 8046 733 1303 1

CONTROL UNITS (COMPUTERS) N 175 108 8 152 

CONTROL VALVES N 166 221 25 301 

CONTROLLABILITY N 624 1296 41 439 

CONTROLLED ATMOSPHERES N 380 296 12 344 

CONTROLLED FUSION N 389 1912 76 141 

CONTROLLERS N 1532 1624 56 785 

CONVECTION N 1486 1598 69 930 

CONVECTION CELLS N 2 11 0 0 

CONVECTION CLOUDS N 299 803 5 73 

CONVECTION CURRENTS N 344 995 2 119 

CONVECT! VE FLOW N 661 3769 16 208 

CONVECTIVE HEAT TRANSFER N 1333 4605 65 673 

CONVENTIONS N 36 194 39 13 

CONVERGENCE N 2720 7078 83 696 1

CONVERGENT NOZZLES N 80 209 0 48 

CONVERGENT-DIVERGENT NOZZLES N 181 628 0 115 

CONVERSATION N 43 5 31 15 

CONVERSION N 81 38 14 63 

CONVERSION TABLES N 51 18 79 36 

CONVERTERS N 82 272 17 118 

CONVERTIBLE FAN-SHAFT ENGINES N 11 21 0 16 

CONVEXITY N 520 560 63 246 

CONVEYORS N 91 43 12 95 

CONVOLUTION INTEGRALS N 454 1068 44 125 

CONVULSIONS N 9 46 1 30 

COOK INLET (AK) N 15 6 1 3 

COOL STARS N 96 579 8 18 

COOLANTS N 595 317 12 511 

COOLERS N 73 45 6 86 

COOLING N 1892 2076 101 1688 

COOLING FINS N 74 227 0 44 

COOLING FLOWS (ASTROPHYSICS) N 8 145 0 1 

COOLING SYSTEMS N 1604 1934 91 1539 

COOPERATION N 42 46 35 40 

COORDINATE TRANSFORMATIONS N 432 1754 8 171 

COORDINATES N 1651 1927 78 900 

COORDINATION N 165 166 12 116 

COORDINATION POLYMERS N 21 3 3 19 

COPLANARITY N 36 202 2 15 

COPOLYMERIZATION N 167 50 20 159 

COPOLYMERS N 601 241 60 381 

COPPER N 2886 2326 111 1615 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

COPPER ALLOYS N 1096 1899 46 567 

COPPER CHLORIDES N 69 112 0 28 

COPPER COMPOUNDS N 318 288 7 201 

COPPER FLUORIDES N 11 3 0 5 

COPPER ISOTOPES N 19 15 0 5 

COPPER OXIDES N 472 2545 2 73 

COPPER SELENIDES N 47 197 0 20 

COPPER SULFIDES N 145 500 2 76 

COPYRIGHTS N 47 9 68 31 

CORAL REEFS N 18 33 21 16 

CORDAGE N 33 20 1 59 

CORDIERITE N 6 27 0 13 

CORE FLOW N 64 288 0 54 

CORE SAMPLING N 254 383 33 216 

CORE STORAGE N 129 81 38 103 

CORES N 212 357 4 257 

CORIOLIS EFFECT N 436 1138 3 160 

CORK (MATERIALS) N 17 4 1 17 

CORN N 306 195 8 84 

CORNEA N 57 87 3 43 

CORNER FLOW N 84 451 1 40 

CORNERS N 112 243 0 24 

CORONA BOREALIS CONSTELLATION N 10 36 0 3 

CORONA GRAPHS N 97 382 1 74 

CORONAL HOLES N 94 370 0 24 

CORONAL LOOPS N 119 807 0 13 

CORONARY ARTERY DISEASE N 46 223 32 15 

CORONARY CIRCULATION N 51 435 12 25 

CORONAS N 122 273 10 143 

COROTATION N 11 103 0 3 

CORPORAL MISSILE N 0 0 0 2 

CORPUSCULAR RADIATION N 113 396 9 72 

CORRECTION N 662 692 19 441 

CORRELATION N 2480 4506 95 1426 

CORRELATION COEFFICIENTS N 627 2100 16 235 

CORRELATION DETECTION N 245 774 1 89 

CORRELATORS N 225 472 2 250 

CORRIDORS N 9 9 1 7 

CORROSION N 1857 450 338 1818 

CORROSION PREVENTION N 947 572 160 910 

CORROSION RESISTANCE N 1904 2977 143 1854 

CORROSION TEST LOOPS N 11 3 0 9 

CORROSION TESTS N 655 1361 48 526 

CORRUGATED PLATES N 65 99 3 31 

CORRUGATED SHELLS N 19 61 1 9 

CORRUGATING N 69 460 0 35 

CORTEXES N 3 25 0 0 

CORTEXES (BOTANY) N 0 1 0 0 

CORTI ORGAN N 14 29 2 7 

CORTICOSTEROIDS N 68 167 4 35 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CORTISONE N 21 46 0 5 

CORVUS MISSILE N 0 0 0 1 

COS-B SATELLITE N 89 227 1 19 

COSINE SERIES N 34 110 4 25 

COSMIC BACKGROUND EXPLORER SATELLITE N 20 48 0 32 

COSMIC DUST N 628 4053 47 244 

COSMIC GASES N 83 586 12 38 

COSMIC NOISE N 92 280 4 86 

COSMIC PLASMA N 268 1356 27 57 

COSMIC RAY ALBEDO N 26 104 0 8 

COSMIC RAY SHOWERS N 493 1931 13 63 

COSMIC RAYS N 3140 8117 318 1269 1

COSMIC X RAYS N 84 312 7 31 

COSMOCHEMISTRY N 79 667 18 40 

COSMOLOGY N 943 6909 452 421 

COSMONAUTS N 281 326 36 304 

COSMOS N 3 4 3 10 

COSMOS SATELLITES N 582 1115 3 247 

COSMOS 110 SATELLITE N 4 6 0 1 

COSMOS 1129 SATELLITE N 38 31 0 3 

COSMOS 137 SATELLITE N 3 15 0 0 

COSMOS 14 SATELLITE N 1 2 0 0 

COSMOS 144 SATELLITE N 2 3 0 0 

COSMOS 149 SATELLITE N 14 24 0 0 

COSMOS 166 SATELLITE N 1 7 0 1 

COSMOS 186 SATELLITE N 0 0 0 3 

COSMOS 188 SATELLITE N 0 0 0 3 

COSMOS 2 SATELLITE N 1 1 0 0 

COSMOS 206 SATELLITE N 1 2 0 0 

COSMOS 213 SATELLITE N 1 3 0 0 

COSMOS 224 SATELLITE N 3 6 0 0 

COSMOS 225 SATELLITE N 5 7 0 0 

COSMOS 3 SATELLITE N 3 0 0 0 

COSMOS 381 SATELLITE N 5 13 0 0 

COSMOS 44 SATELLITE N 2 2 0 0 

COSMOS 5 SATELLITE N 3 6 0 1 

COSMOS 54 SATELLITE N 2 1 0 4 

COSMOS 6 SATELLITE N 2 1 0 1 

COSMOS 71 SATELLITE N 0 1 0 5 

COSMOS 782 SATELLITE N 29 25 1 5 

COSMOS 936 SATELLITE N 24 27 1 5 

COSMOS 954 SATELLITE N 3 4 0 2 

COSPAS N 6 32 0 11 

COSSERAT SURFACES N 15 184 1 2 

COST ANALYSIS N 5309 3901 381 4588 1

COST EFFECTIVENESS N 3706 5677 173 3336 1

COST ESTIMATES N 3034 2049 198 2715 

COST INCENTIVES N 24 50 3 31 

COST REDUCTION N 1457 4127 49 969 

COSTA RICA N 10 25 2 12 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

COSTS N 2534 852 497 3642 

COTTON N 88 51 1 45 

COTTON FIBERS N 32 27 4 42 

COUCHES N 15 0 1 31 

COUETTE FLOW N 167 749 6 44 

COUGH N 3 3 0 1 

COULOMB COLLISIONS N 314 778 15 101 

COULOMB POTENTIAL N 370 452 14 105 

COULOMETERS N 49 14 1 28 

COULOMETRY N 67 39 10 27 

COUNTDOWN N 23 19 3 142 

COUNTER ROTATION N 81 148 0 34 

COUNTER-ROTATING WHEELS N 31 29 3 9 

COUNTERBALANCES N 15 14 0 12 

COUNTERFLOW N 110 276 2 52 

COUNTERMEASURES N 131 48 12 1350 

COUNTERS N 232 166 35 222 

COUNTERSINKING N 3 8 0 3 

COUNTING N 152 65 13 106 

COUNTING CIRCUITS N 114 154 7 96 

COUNTING RATE COMPUTERS N 12 9 0 9 

COUPLED MODES N 340 2909 17 93 

COUPLERS N 168 295 13 158 

COUPLES N 23 36 3 17 

COUPLING N 1265 920 48 804 

COUPLING CIRCUITS N 256 792 16 298 

COUPLING COEFFICIENTS N 298 758 3 117 

COUPLINGS N 257 192 17 344 

COURIER SATELLITE N 0 2 0 0 

COVALENCE N 33 22 4 6 

COVALENT BONDS N 77 121 10 36 

COVARIANCE N 1254 2130 25 387 

COVERALLS N 18 6 0 46 

COVERINGS N 132 58 1 187 

COWLINGS N 64 75 0 78 

CRAB NEBULA N 198 1235 12 73 

CRABS N 5 15 4 10 

CRACK ARREST N 58 160 0 20 

CRACK CLOSURE N 193 675 1 34 

CRACK GEOMETRY N 163 2463 1 32 

CRACK INITIATION N 1587 4260 37 518 

CRACK OPENING DISPLACEMENT N 239 762 0 8 

CRACK PROPAGATION N 5562 14444 178 2253 2

CRACK TIPS N 351 2363 2 64 

CRACKING (CHEMICAL ENGINEERING) N 80 19 3 85 

CRACKING (FRACTURING) N 1556 1748 86 1086 

CRACKS N 1297 1164 28 812 

CRAMPS N 1 0 0 0 

CRANES N 48 51 10 63 

CRANIUM N 20 28 2 12 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CRANK-NICHOLSON METHOD N 12 106 0 3 

CRASH INJURIES N 256 185 12 86 

CRASH LANDING N 175 225 2 109 

CRASHES N 323 107 20 212 

CRASHWORTHINESS N 164 199 10 70 

CRATERING N 177 461 12 213 

CRATERS N 225 335 11 227 

CRATONS N 46 30 0 4 

CRAWLER TRACTORS N 5 7 0 29 

CRAY COMPUTERS N 286 282 1 49 

CRAYONS N 0 0 0 2 

CREATINE N 9 46 0 7 

CREATININE N 21 28 0 13 

CREATIVITY N 51 28 110 42 

CREEP ANALYSIS N 414 1176 47 192 

CREEP BUCKLING N 67 161 5 22 

CREEP DIAGRAMS N 39 365 2 17 

CREEP PROPERTIES N 1522 2536 139 735 

CREEP RUPTURE STRENGTH N 492 1658 35 259 

CREEP STRENGTH N 411 988 18 248 

CREEP TESTS N 517 1722 24 280 

CREPE N 1 0 0 0 

CRESOLS N 16 11 1 13 

CRETACEOUS PERIOD N 1 9 0 1 

CRETACEOUS-TERTIARY BOUNDARY N 0 25 0 2 

CREVASSES N 3 2 1 2 

CREW EXPERIMENT STATIONS N 2 3 0 2 

CREW OBSERVATION STATIONS N 1 3 0 1 

CREW PROCEDURES (INFLIGHT) N 86 95 2 27 

CREW PROCEDURES (PREFLIGHT) N 9 13 1 4 

CREW SIZE N 13 4 0 1 

CREW WORKSTATIONS N 85 149 1 123 

CREWS N 101 32 6 238 

CRICKETS N 0 0 1 1 

CRIME N 34 29 29 9 

CRITERIA N 513 374 17 291 

CRITICAL EXPERIMENTS N 140 22 9 116 

CRITICAL FLICKER FUSION N 13 83 1 9 

CRITICAL FLOW N 124 314 4 40 

CRITICAL FREQUENCIES N 135 1024 1 122 

CRITICAL LOADING N 191 3865 16 114 

CRITICAL MASS N 184 121 1 61 

CRITICAL PATH METHOD N 106 43 80 57 

CRITICAL POINT N 326 743 32 138 

CRITICAL PRESSURE N 101 363 3 51 

CRITICAL TEMPERATURE N 477 1100 6 203 

CRITICAL VELOCITY N 193 852 2 81 

CROCCO METHOD N 30 83 0 17 

CROCCO-LEE THEORY N 12 11 1 2 

CROLOY N 4 0 0 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CROP CALENDARS N 53 9 0 3 

CROP DUSTING N 17 9 2 14 

CROP GROWTH N 605 373 68 275 

CROP IDENTIFICATION N 547 690 12 115 

CROP INVENTORIES N 392 372 13 65 

CROP VIGOR N 131 175 9 65 

CROPS N 99 30 22 51 

CROSS CORRELATION N 541 1886 3 208 

CROSS COUPLING N 123 461 2 52 

CROSS FLOW N 668 1386 13 267 

CROSS POLARIZATION N 145 671 0 49 

CROSS RELAXATION N 22 37 0 10 

CROSS SECTIONS N 422 2251 5 269 

CROSSBEDDING (GEOLOGY) N 8 2 0 5 

CROSSED FIELD AMPLIFIERS N 74 75 2 268 

CROSSED FIELD GUNS N 22 16 0 26 

CROSSED FIELDS N 145 638 1 109 

CROSSINGS N 52 26 1 24 

CROSSLINK lNG N 513 220 18 500 

CROSSOVERS N 31 68 0 12 

CROSSTALK N 168 438 2 124 

CROWDING N 6 7 3 6 

CRUCIBLES N 107 82 3 115 

CRUCIFORM WINGS N 40 54 0 101 

CRUDE OIL N 1209 419 437 1099 

CRUISE MISSILES N 96 167 2 1037 

CRUISING FLIGHT N 245 492 3 162 

CRUSHERS N 5 1 1 4 

CRUSHING N 56 38 1 37 

CRUSTAL FRACTURES N 249 176 13 113 

CRUSTS N 39 48 1 39 

CRYOCHEMISTRY N 4 9 2 15 

CRYOCYCLE PRINCIPLE N 7 3 0 8 

CRYODEPOSITS N 22 30 1 13 

CRYOGENIC COMPUTER STORAGE N 16 17 0 25 

CRYOGENIC COOLING N 236 507 10 178 

CRYOGENIC EQUIPMENT N 668 1130 35 734 

CRYOGENIC FLUID STORAGE N 377 298 10 540 

CRYOGENIC FLUIDS N 303 320 16 377 

CRYOGENIC GYROSCOPES N 14 27 0 16 

CRYOGENIC MAGNETS N 89 118 4 32 

CRYOGENIC ROCKET PROPELLANTS N 275 317 6 637 

CRYOGENIC STORAGE N 47 78 3 66 

CRYOGENIC TEMPERATURE N 92 221 2 23 

CRYOGENIC WIND TUNNELS N 332 239 1 123 

CRYOGENICS N 1666 1126 226 1837 

CRYOLITE N 9 12 1 13 

CRYOPUMPING N 118 223 9 110 

CRYOSAR N 0 3 1 0 

CRYOSTATS N 258 376 7 174 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CRYOTRAPPING N 9 9 0 15 

CRYOTRONS N 17 25 3 3 

CRYPTOGRAPHY N 56 24 16 45 

CRYSTAL DEFECTS N 1988 2445 213 797 

CRYSTAL DISLOCATIONS N 852 3427 71 343 

CRYSTAL FILTERS N 40 64 7 82 

CRYSTAL GROWTH N 3079 3588 168 3048 

CRYSTAL LATTICES N 2553 3520 222 1048 

CRYSTAL OPTICS N 213 2909 67 108 

CRYSTAL OSCILLATORS N 220 460 16 235 

CRYSTAL RECTIFIERS N 27 33 8 140 

CRYSTAL STRUCTURE N 4020 4689 466 1907 1

CRYSTAL SURFACES N 332 746 24 175 

CRYSTALLINITY N 414 407 33 194 

CRYSTALLITES N 95 138 2 28 

CRYSTALLIZATION N 1137 1753 103 981 

CRYSTALLOGRAPHY N 1193 1876 538 700 

CRYSTALS N 1193 371 293 1587 

CUBA N 10 40 3 13 

CUBANE N 9 2 0 10 

CUBES (MATHEMATICS) N 49 71 9 24 

CUBIC EQUATIONS N 62 237 6 20 

CUBIC LATTICES N 140 455 6 57 

CUES N 205 173 0 112 

CUFFS N 6 5 0 10 

CUL TIVAT!ON N 75 42 17 48 

CULTURAL RESOURCES N 31 9 10 24 

CULTURE (SOCIAL SCIENCES) N 104 62 457 147 

CULTURE TECHNIQUES N 392 349 105 357 

CUMULATIVE DAMAGE N 188 1561 6 72 

CUMULONIMBUS CLOUDS N 82 252 2 34 

CUMULUS CLOUDS N 348 938 2 108 

CUPOLAS N 4 7 0 1 

CURARE N 3 5 1 1 

CURES N 7 5 5 9 

CURIE TEMPERATURE N 162 307 2 80 

CURIE-WEISS LAW N 34 19 1 14 

CURING N 664 1030 18 801 

CURIUM N 24 3 0 24 

CURIUM COMPOUNDS N 4 0 0 4 

CURIUM ISOTOPES N 26 7 0 16 

CURIUM 242 N 5 3 0 22 

CURIUM 244 N 31 10 0 35 

CURL N 0 0 0 0 

CURL (MATERIALS) N 3 2 0 1 

CURL (VECTORS) N 12 19 0 2 

CURRENT ALGEBRA N 81 2 7 17 

CURRENT AMPLIFIERS N 74 125 3 67 

CURRENT CONVERTERS (AC TO DC) N 50 61 10 33 

CURRENT DENSITY N 1779 5774 6 716 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM * .. ***** TYPE STAR IAA NLN OTHER 

CURRENT DISTRIBUTION N 619 2784 5 230 

CURRENT REGULATORS N 207 186 13 187 

CURRENT SHEETS N 191 1126 3 25 

CURRENTS N 34 7 9 38 

CURTAINS N 18 11 1 16 

CURTISS-WRIGHT AIRCRAFT N 0 3 4 3 

CURVATURE N 723 1521 26 274 

CURVE FITTING N 899 976 39 427 

CURVED BEAMS N 51 253 1 27 

CURVED PANELS N 119 414 1 57 

CURVES N 43 54 8 18 

CURVES (GEOMETRY) N 548 487 82 263 

CUSHIONCRAFT GROUND EFFECT MACHINE N 19 11 3 14 

CUSHIONS N 114 55 6 91 

CUSPS N 39 122 0 13 

CUSPS (LANDFORMS) N 6 5 0 1 

CUSPS (MATHEMATICS) N 41 52 2 18 

CUT-OFF N 26 202 0 9 

CUTTERS N 176 55 19 263 

CUTTING N 255 171 37 281 

CV-340 AIRCRAFT N 14 1 1 2 

CV-440 AIRCRAFT N 2 0 1 0 

CV-880 AIRCRAFT N 1 1 4 0 3 

CV-990 AIRCRAFT N 81 45 1 66 

CYANAMIDES N 14 27 1 8 

CYANATES N 40 37 3 26 

CYANIDES N 164 313 9 105 

CYANO COMPOUNDS N 82 266 2 39 

CYANOACETYLENE N 7 78 0 0 

CYANOCOBALAMIN N 3 9 1 1 

CYANOGEN N 58 246 3 25 

CYANOSIS N 0 3 0 1 

CYANURATES N 4 8 0 7 

CYANURIC ACID N 1 4 0 4 

CYBERNETICS N 793 830 259 456 

CYCLES N 483 228 64 507 

CYCLIC ACCELERATORS N 50 11 0 22 

CYCLIC AMP N 0 29 0 1 

CYCLIC COMPOUNDS N 116 53 16 92 

CYCLIC HYDROCARBONS N 182 274 21 110 

CYCLIC LOADS N 1197 6090 37 472 

CYCLOBUTANE N 16 8 2 16 

CYCLOGENESIS N 189 378 0 34 

CYCLOHEXANE N 126 63 4 83 

CYCLOIDS N 10 18 0 5 

CYCLONES N 749 1008 32 353 

CYCLOPROPANE N 41 16 6 12 

CYCLOPS PLASMA ACCELERATOR N 0 0 1 3 

CYCLOTRON FREQUENCY N 187 943 0 40 

CYCLOTRON RADIATION N 223 898 5 50 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

CYCLOTRON RESONANCE N 497 1103 19 161 

CYCLOTRON RESONANCE DEVICES N 205 380 2 81 

CYCLOTRONS N 416 46 20 233 

CYGNUS CONSTELLATION N 227 758 1 68 

CYLINDERS N 180 1122 14 170 

CYLINDRICAL ANTENNAS N 95 575 6 34 

CYLINDRICAL BODIES N 2262 3404 33 1293 

CYLINDRICAL CHAMBERS N 66 196 2 74 

CYLINDRICAL COORDINATES N 17 146 0 5 

CYLINDRICAL PLASMAS N 45 198 1 10 

CYLINDRICAL SHELLS N 1307 6007 41 521 

CYLINDRICAL TANKS N 87 196 2 62 

CYLINDRICAL WAVES N 76 627 4 21 

CYPRUS N 2 3 2 1 

CYRILLID METEOROIDS N 0 1 0 0 

CYSTEAMINE N 37 46 0 6 

CYSTEINE N 18 28 1 9 

CYSTIC FIBROSIS N 1 3 1 0 

CYSTS N 3 12 2 8 

CYTIDYLIC ACID N 0 4 0 1 

CYTOCHROME$ N 36 63 11 15 

CYTOGENE SIS N 66 64 43 31 

CYTOLOGY N 204 973 286 174 

CYTOMETRY N 32 20 0 4 

CYTOPLASM N 58 132 10 45 

CZECHOSLOVAKIA N 126 94 14 202 

CZECHOSLOVAKIAN SPACE PROGRAM N 2 2 0 9 

CZECHOSLOVAKIAN SPACECRAFT N 0 5 0 0 

CZOCHRALSKI METHOD N 236 416 2 237 

D LINES N 27 323 1 22 

D REGION N 397 1428 8 159 

D-1 SATELLITE N 7 13 0 3 

D-2 SATELLITES N 14 43 0 4 

D-558 AIRCRAFT N 2 0 1 1 

DACRON (TRADEMARK) N 23 14 0 23 

DALTON LAW N 9 4 3 0 

DAMAGE N 1176 529 27 1374 

DAMAGE ASSESSMENT N 672 958 13 734 

DAMKOHLER NUMBER N 29 85 0 0 

DAMPERS N 16 103 1 11 

DAMPERS (VALVES) N 39 10 0 23 

DAMPING N 1814 1520 69 1174 

DAMPING TESTS N 90 158 1 61 

DAMS N 156 41 22 140 

DANISH SPACE PROGRAM N 0 1 0 0 

DARK ADAPTATION N 85 249 2 37 

DARK MATTER N 95 916 3 13 

DARKENING N 14 56 0 5 

DARKNESS N 52 70 3 41 

DARKROOMS N 9 6 7 8 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

DASSAULT AIRCRAFT N 15 36 1 3 

DAST PROGRAM N 3 2 0 5 

DATA N 49 9 29 102 

DATA ACQUISITION N 9210 7126 279 6206 2

DATA BASE MANAGEMENT SYSTEMS N 1474 283 225 750 

DATA BASES N 6283 2052 399 4730 1

DATA COLLECTION PLATFORMS N 388 155 6 80 

DATA COMPRESSION N 552 731 22 212 

DATA CONVERSION ROUTINES N 219 42 3 119 

DATA CONVERTERS N 158 228 12 167 

DATA CORRELATION N 1397 2385 20 751 

DATA FLOW ANALYSIS N 154 357 3 26 

DATA INTEGRATION N 91 152 1 57 

DATA LINKS N 1496 2098 24 1403 

DATA MANAGEMENT N 1997 1006 286 1481 

DATA PROCESSING N 13036 7736 3726 11249 3

DATA PROCESSING EQUIPMENT N 1541 424 144 2197 

DATA PROCESSING TERMINALS N 533 259 57 410 

DATA RECORDERS N 242 229 6 181 

DATA RECORDING N 722 1571 42 565 

DATA REDUCTION N 4579 6305 100 3454 1

DATA RETRIEVAL N 746 446 98 547 

DATA SAMPLING N 686 2423 56 252 

DATA SIMULATION N 84 394 0 10 

DATA SMOOTHING N 604 874 14 185 

DATA STORAGE N 2519 1268 504 2155 

DATA STRUCTURES N 305 372 40 81 

DATA SYSTEMS N 2109 1571 193 2040 

DATA TRANSFER (COMPUTERS) N 242 261 0 19 

DATA TRANSMISSION N 3267 4495 451 3270 1

DATUM (ELEVATION) N 20 12 2 22 

DAWN CHORUS N 37 139 0 6 

DAWSONITE N 6 2 0 3 

DAYGLDW N 55 284 1 30 

DAYTIME N 305 1236 7 222 

DC 10 AIRCRAFT N 77 173 5 36 

DC 3 AIRCRAFT N 16 16 5 8 

DC 7 AIRCRAFT N 8 5 0 0 

DC 8 AIRCRAFT N 74 65 0 14 

DC 9 AIRCRAFT N 61 69 0 15 

DDP COMPUTERS N 1 0 0 0 

DDP 516 COMPUTER N 5 1 1 1 

DDT N 17 11 5 13 

DE BROGLIE WAVELENGTHS N 14 28 2 5 

DE HAVILLAND AIRCRAFT N 36 40 7 11 

DEACTIVATION N 129 132 4 148 

DEAD RECKONING N 43 69 2 30 

DEATH N 87 93 40 119 

DEATH VALLEY (CA) N 23 16 1 13 

DEBRIS N 179 142 0 172 
910117 

NASA 

******* SUBJECT TERM ******* 

DEBYE LENGTH 

DEBYE-HUCKEL THEORY 

DEBYE-SCHERRER METHOD 

DECAMETRIC WAVES 

DECAY 

DECAY 

DECARBURIZATION 

DECARBOXYLATION 

DECARBONATION 

RATES 

DECCA NAVIGATION 

DECIDUOUS 

DECEPTION 

DECELERATION 

TREES 

DECIMAL TO BINARY CONVERTERS 

DECIMETER 

DECIMALS 

WAVES 

DECISION MAKING 

DECISION THEORY 

DECOMPRESSION 

DECOMPOSITION 

DECOMMUTATORS 

DECOMMISSIONING 

DECODING 

DECODERS 

DECLINATION 

DECISIONS 

SICKNESS 

DEEP 

DEDUCTION 

DECOYS 

DECOUPLING 

DECONTAMINATION 

DECONGESTANTS 

OECONDITIONING 

DRAWING 

DEEP SCATTERING LAYERS 

DEEP SPACE 

COMBINED 

DEEP SPACE INSTRUMENTATION FACILITY 

DEEP SPACE NETWORK 

DEEP WATER 

DEEP WELL INJECTION (WASTES) 

DEEPWATER TERMINALS 

DEFENDER 

DEFECTS 

DEER 

PROJECT 

DEFENSE 

DEFENSE 

COMMUNICATIONS SATELLITE SYSTEM 

DEFENSE COMMUNICATIONS SYSTEM (DCS) 

DEFENSE INDUSTRY 

DEFENSE PROGRAM 

DEFLAGRATION 

DEFINITION 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

STAR 

31 

16 

14 

65 

24 

29 

93 

434 

544 

16 

277 

38 

14 

9 

45 

12 

3962 

955 

37 

465 

280 

125 

4 

26 

1311 

237 

24 

3 

210 

345 

15 

11 

54 

11 

169 

98 

1452 

93 

5 

18 

22 

1290 

63 

25 

13 

17 

642 

121 

49 

232 

STATISTICS 

IAA 

470 

37 

79 

644 

38 

12 

13 

923 

190 

45 

720 

6 

50 

2 

12 

333 

1854 

466 

16 

745 

309 

216 

0 

25 

347 

712 

42 

6 

432 

149 

36 

20 

11 

225 

107 

49 

273 

85 

4 

2 

15 

1026 

16 

147 

60 

519 

121 

45 

259 

NLN 

1 

1 

0 

2 

0 

4 

1 

27 

3 

3 

2 

5 

1 

3 

14 

1 

124 

984 

11 

46 

9 

14 

0 

1 

11 

51 

1 

4 

33 

0 

6 

16 

1 

0 

30 

7 

3 

0 

0 

1 

0 

88 

0 

18 

2 

2 

62 

180 

14 

5 

OTHER 

54 

10 

17 

15 

9 

26 

13 

156 

238 

19 

225 

12 

66 

7 

14 

12 

2666 

120 

535 

56 

227 

189 

3 

37 

109 

859 

51 

0 

408 

96 

515 

19 

10 

11 

159 

30 

259 

37 

2 

33 

5 

1143 

99 

63 

76 

82 

176 

1037 

40 

224 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM •****** TYPE STAR IAA NLN OTHER 

DEFLECTION N 1045 1550 30 670 

DEFLECTORS N 134 191 3 112 

DEFLUORINATION N 4 1 0 2 

DEFOCUSING N 52 302 2 22 

DEFOLIANTS N 3 0 1 7 

DEFOLIATION N 25 41 1 6 

DEFORESTATION N 71 66 5 28 

DEFORMATION N 3872 2565 264 2040 

DEFORMETERS N 16 18 1 9 

DEFROSTING N 23 5 1 10 

DEGASSING N 162 293 11 128 

DEGENERATE MATTER N 22 190 0 5 

DEGENERATION N 89 163 4 28 

DEGRADATION N 1371 659 53 1391 

DEGREES OF FREEDOM N 1512 4603 27 722 

DEHUMIDIFICATION N 43 39 2 50 

DEHYDRATED FOOD N 53 13 5 36 

DEHYDRATION N 194 232 6 136 

DEHYDROGENATION N 87 75 10 58 

DEICERS N 107 103 2 119 

DEICING N 93 115 4 121 

DEIMOS N 39 177 4 27 

DEIONIZATION N 29 52 1 18 

DELAMINATING N 452 1423 2 165 

DELAWARE N 129 18 29 83 

DELAWARE BAY (US) N 15 4 1 7 

DELAWARE RIVER BASIN (US) N 37 12 1 23 

DELAY N 389 200 2 230 

DELAY CIRCUITS N 143 237 3 96 

DELAY LINES N 268 871 11 359 

DELAY LINES (COMPUTER STORAGE) N 41 26 4 27 

DELAYED FLAP APPROACH N 0 1 0 0 

DELETION N 11 3 0 5 

DELFT CAMERA N 0 1 1 0 

DELINEATION N 16 26 0 9 

DELIVERY N 46 31 10 198 

DELMARVA PENINSULA (DE-MD-VA) N 2 6 3 4 

DELPHI METHOD (FORECASTING) N 29 13 5 18 

DELRIN (TRADEMARK) N 3 4 0 4 

DELTA ANTENNAS N 2 2 0 3 

DELTA FUNCTION N 43 567 1 10 

DELTA LAUNCH VEHICLE N 100 131 3 481 

DELTA MODULATION N 104 200 3 64 

DELTA WINGS N 838 1409 7 632 

DELTAS N 65 63 5 34 

DEMAGNETIZATION N 82 155 3 25 

DEMAND (ECONOMICS) N 741 233 56 508 

DEMAND ASSIGNMENT MULTIPLE ACCESS N 8 131 0 2 

DEMINERALIZING N 52 19 10 41 

DEMODULATION N 204 389 14 151 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

DEMODULATORS N 199 350 8 237 

DEMOGRAPHY N 174 20 29 241 

DEMULTIPLEXING N 31 90 0 10 

DENDRITIC CRYSTALS N 264 628 3 173 

DENDROCHRONOLOGY N 8 22 2 5 

DENITROGENA T I ON N 83 43 7 63 

DENMARK N 178 55 15 105 

DENSE PLASMAS N 176 1499 10 55 

DENSIFICATION N 170 373 4 117 

DENS I METERS N 19 3 0 4 

DENSITOMETERS N 224 263 9 129 

DENSITY N 90 36 5 146 

DENSITY (MASS/VOLUME) N 1208 922 52 700 

DENSITY (NUMBER/VOLUME) N 290 298 3 140 

DENSITY DISTRIBUTION N 899 6736 7 380 

DENSITY MEASUREMENT N 736 1553 19 413 

DENSITY WAVE MODEL N 53 551 0 17 

DENTAL CALCULI N 4 0 1 3 

DENTISTRY N 60 27 28 67 

DEOXIDIZING N 56 58 2 24 

DEOXIFICATION N 0 2 0 1 

DEOXYGENATION N 45 26 1 12 

DEOXYRIBONUCLEIC ACID N 355 383 90 296 

DEPENDENCE N 83 18 7 32 

DEPENDENT VARIABLES N 195 149 4 64 

DEPERSONALIZATION N 27 3 9 8 

DEPLETION N 151 261 3 84 

DEPLOYMENT N 585 374 5 672 

DEPOLARIZATION N 232 709 8 83 

DEPOLYMERIZATION N 28 21 2 31 

DEPOSITION N 1559 721 71 941 

DEPOSITS N 195 96 26 201 

DEPRECIATION N 9 12 8 7 

DEPRESSANTS N 4 12 3 13 

DEPRESSION N 14 20 1 6 

DEPRIVATION N 5 12 0 8 

DEPTH N 585 196 3 394 

DEPTH MEASUREMENT N 309 243 2 207 

DER !VAT ION N 187 44 21 94 

DERMATITIS N 18 5 5 13 

DERMATOLOGY N 13 15 12 6 

DESALINIZATION N 170 44 35 200 

DESATURATION N 13 21 0 11 

DE SCALING N 11 4 0 14 

DESCENT N 111 106 3 109 

DESCENT PROPULSION SYSTEMS N 31 15 1 107 

DESCENT TRAJECTORIES N 240 356 4 610 

DESCRIPTIONS N 186 18 45 108 

DESCRIPTIVE GEOMETRY N 116 20 27 32 

DESENSITIZING N 20 23 1 23 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

DESERT ADAPTATION N 8 21 2 7 

DESERTIFICATION N 28 59 2 9 

DESERTLINE N 4 12 0 4 

DESERTS N 376 282 55 218 

DESICCANTS N 56 18 1 40 

DESICCATORS N 5 4 0 7 

DESIGN N 311 158 170 467 

DESIGN ANALYSIS N 7129 10999 404 4625 2

DESIGN TO COST N 68 253 8 106 

DESORPTION N 523 535 16 230 

DESTABILIZATION N 26 85 0 7 

DESTRUCTION N 69 25 3 200 

DESTRUCTIVE TESTS N 263 425 11 212 

DESULFURIZING N 330 209 19 273 

DESYNCHRONIZATION (BIOLOGY) N 13 26 1 4 

DETACHMENT N 16 55 0 4 

DETECTION N 1819 176 76 2090 

DETECTORS N 386 204 43 682 

DETERGENTS N 57 29 26 51 

DETERIORATION N 178 81 48 266 

DETERMINANTS N 150 189 51 83 

DETONABLE GAS MIXTURES N 85 566 3 27 

DETONATION N 831 442 31 770 

DETONATION WAVES N 477 1335 12 300 

DETONATORS N 134 53 5 203 

DEUTERIDES N 31 48 1 13 

DEUTERIUM N 945 1241 9 387 

DEUTERIUM COMPOUNDS N 178 376 1 79 

DEUTERIUM FLUORIDES N 14 17 0 31 

DEUTERIUM PLASMA N 112 666 2 22 

DEUTERON IRRADIATION N 75 22 1 33 

DEUTERONS N 581 129 2 138 

DEVELOPING NATIONS N 253 467 74 149 

DEVELOPMENT N 63 27 63 173 

DEVIATION N 133 116 16 76 

DEVICES N 17 5 13 52 

DEW N 75 35 1 54 

DEW POINT N 199 58 1 81 

DEWATERING N 16 2 1 22 

DEWAXING N 3 0 1 0 

DEXTRANS N 26 10 0 9 

OF LASERS N 50 184 0 124 

DH 112 AIRCRAFT N 2 2 0 1 

DH 115 AIRCRAFT N 2 2 0 3 

DH 121 AIRCRAFT N 2 30 0 14 

DH 125 AIRCRAFT N 2 6 0 1 

DHC 2 AIRCRAFT N 5 1 0 2 

OHC 4 AIRCRAFT N 2 2 0 5 

DHC 5 AIRCRAFT N 6 19 0 7 

DIABETES MELLITUS N 26 44 19 27 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

DIADEME SATELLITES N 10 10 0 2 

DIAGNOSIS N 741 1119 326 556 

DIAGRAMS N 263 331 98 379 

DIAL SATELLITE N 5 12 0 0 

DIALLYL COMPOUNDS N 6 6 0 6 

DIALS N 14 10 3 21 

DIALYSIS N 27 13 5 28 

DIAMAGNETISM N 178 399 13 39 

DIAMANT LAUNCH VEHICLE N 13 34 0 27 

DIAMETERS N 258 837 4 219 

DIAMINES N 90 46 1 59 

DIAMONDS N 352 737 26 250 

DIAPHRAGM (ANATOMY) N 12 61 1 4 

DIAPHRAGMS N 6 48 0 35 

DIAPHRAGMS (MECHANICS) N 191 360 12 283 

DIASTOLE N 18 171 2 7 

DIASTOLIC PRESSURE N 11 112 2 4 

DIATOMIC GASES N 94 397 4 29 

DIATOMIC MOLECULES N 392 915 66 173 

DIBASIC COMPOUNDS N 2 2 0 4 

DIBORANE N 41 25 1 162 

DIBROMIDES N 7 6 1 5 

DIBUTYL COMPOUNDS N 7 7 0 4 

DICARBOXYLIC ACIDS N 13 15 0 10 

DICHLORIDES N 30 11 1 10 

DICHOTOMIES N 19 48 1 4 

DICHROISM N 110 145 14 60 

DICKE RADIOMETERS N 40 91 0 15 

DICTIONARIES N 295 47 2749 242 

DIDYMIUM N 5 2 0 2 

DIELDRIN N 1 2 0 2 

DIELECTRIC PERMEABILITY N 57 435 0 38 

DIELECTRIC POLARIZATION N 86 109 5 48 

DIELECTRIC PROPERTIES N 1520 1739 75 1684 

DIELECTRICS N 2379 6008 270 2062 1

DIELS-ALDER REACTIONS N 16 4 0 7 

DIENCEPHALON N 1 18 0 1 

DIENES N 45 12 3 41 

DIES N 242 244 24 382 

DIESEL ENGINES N 743 306 82 663 

DIESEL FUELS N 354 94 15 261 

DIETHYL ETHER N 14 19 0 7 

DIETHYL HYDROGEN PHOSPHITE (DEHP) N 1 1 0 0 

DIETS N 223 224 78 136 

DIFFERENCE EQUATIONS N 746 1787 84 223 

DIFFERENCES N 79 35 6 33 

DIFFERENTIAL AMPLIFIERS N 51 187 22 101 

DIFFERENTIAL ANALYZERS N 9 6 3 4 

DIFFERENTIAL CALCULUS N 200 301 104 63 

DIFFERENTIAL EQUATIONS N 6808 18126 1274 2683 2
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

DIFFERENTIAL GEOMETRY N 208 281 161 101 

DIFFERENTIAL INTERFEROMETRY N 110 135 0 21 

DIFFERENTIAL PRESSURE N 78 57 2 87 

DIFFERENTIAL PULSE CODE MODULATION N 19 116 0 2 

DIFFERENTIATION N 17 39 8 10 

DIFFERENTIATION (BIOLOGY) N 78 69 39 29 

DIFFERENTIATORS N 24 51 6 17 

DIFFRACTION N 804 369 137 496 

DIFFRACTION LIMITED CAMERAS N 25 67 1 16 

DIFFRACTION PATHS N 87 118 2 38 

DIFFRACTION PATTERNS N 685 4860 31 240 

DIFFRACTION PROPAGATION N 60 358 5 49 

DIFFRACTION RADIATION N 11 164 0 23 

DI FFRACTOMETERS N 139 126 6 77 

DIFFUSE RADIATION N 305 1687 10 113 

DIFFUSERS N 180 851 3 149 

DIFFUSION N 2622 1125 232 1597 

DIFFUSION COEFFICIENT N 1255 3162 12 432 

DIFFUSION ELECTRODES N 63 41 1 33 

DIFFUSION FLAMES N 327 1310 10 102 

DIFFUSION LENGTH N 8 59 0 1 

DIFFUSION PUMPS N 26 31 4 20 

DIFFUSION THEORY N 374 1280 33 134 

DIFFUSION WAVES N 31 70 4 14 

DIFFUSION WELDING N 300 547 10 389 

DIFFUSIVITY N 270 290 6 137 

DIFLUORIDES N 17 18 0 43 

DIFLUORO COMPOUNDS N 26 29 0 125 

DIFLUOROUREA N 0 0 0 5 

DIGESTING N 37 42 13 34 

DIGESTIVE SYSTEM N 51 54 28 22 

DIGITAL COMMAND SYSTEMS N 129 129 11 99 

DIGITAL COMPUTERS N 3930 3002 1459 3785 1

DIGITAL DATA N 1907 2332 91 921 

DIGITAL ELECTRONICS N 93 253 11 23 

DIGITAL FILTERS N 942 2584 127 426 

DIGITAL INTEGRATORS N 138 158 28 72 

DIGITAL NAVIGATION N 107 484 8 68 

DIGITAL RADAR SYSTEMS N 193 818 12 111 

DIGITAL SIMULATION N 1122 2943 120 701 

DIGITAL SPACECRAFT TELEVISION N 22 30 1 6 

DIGITAL SYSTEMS N 4120 4535 430 4233 1

DIGITAL TECHNIQUES N 1949 4279 269 902 

DIGITAL TELEVISION N 57 86 8 19 

DIGITAL TO ANALOG CONVERTERS N 261 338 41 268 

DIGITAL TO VOICE TRANSLATORS N 23 38 3 17 

DIGITAL TRANSDUCERS N 60 181 2 32 

DIGITALIS N 5 16 2 0 

DIGITS N 25 10 3 5 

DIHEDRAL ANGLE N 40 75 1 29 
910117 

NASA 

******* SUBJECT TERM ******* 

DILATATIONAL 

DIISDCYANATES 

DIHYDRIDES 

DIHYDRAZINE 

WAVES 

DIMENSIONAL 

DIMENHYDRINATE 

DILUTION 

DILUENTS 

DILATOMETRY 

ANALYSIS 

DIMENSIONAL MEASUREMENT 

DIMENSIONAL STABILITY 

DIMENSIONLESS NUMBERS 

DINING 

DIMPLING 

DIMMING 

DIMETHYLHYDRAZINES 

DIMERS 

DIMERIZATION 

DIMERCAPROL 

DIMENSIONS 

PHILOSOPHERS PROBLEM 

DIOPHANTINE 

DIONE 

DIODES 

DINITRATES 

EQUATION 

DIPHENYL 

DIOXIDES 

DIORITE 

COMPOUNDS 

DIPHENYL HYDANTOIN 

DIPOLE 

DIPLEXERS 

DIPHTHERIA 

DIPHOSPHATES 

ANTENNAS 

DIPOLE MOMENTS 

DIRAC 

DIPPING 

DIPOLES 

EQUATION 

DIRECT BROADCAST SATELLITES 

DIRECT CURRENT 

DIRECT LIFT CONTROLS 

DIRECT POWER GENERATORS 

DIRECTION 

DIRECTION 

FINDING 

DIRECTIONAL ANTENNAS 

DIRECTIONAL CONTROL 

DIRECTIONAL COUPLERS 

COMBINED 

DIRECTIONAL SOLIDIFICATION (CRYSTALS) 

DIRECTIONAL STABILITY 

DIRECTORS 

DIRECTORIES 

DIRECTIVITY 

(ANTENNA ELEMENTS) 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

STAR 

3 

36 

61 

20 

15 

16 

206 

1 

153 

185 

330 

90 

723 

39 

232 

33 

4 

9 

8 

15 

1415 

8 

27 

4 

153 

53 

1 

10 

2 

38 

121 

437 

473 

25 

265 

18 

1175 

45 

269 

79 

26 

185 

298 

17 

195 

152 

221 

19 

85 

STATISTICS 

IAA 

5 

8 

0 

61 

213 

58 

152 

4 

300 

428 

214 

332 

495 

0 

32 

284 

28 

5 

28 

7 

4 

1392 

35 

50 

6 

31 

26 

2 

26 

0 

82 

1444 

388 

972 

16 

187 

562 

1608 

20 

161 

73 

159 

1094 

786 

151 

772 

141 

324 

8 

42 

NLN 

0 

4 

1 

6 

0 

0 

1 

0 

31 

66 

9 

5 

33 

0 

0 

0 

0 

0 

2 

3 

0 

146 

0 

13 

0 

0 

0 

2 

3 

3 

1 

18 

17 

0 

4 

21 

2 

98 

0 

48 

39 

3 

1 

0 

9 

7 

2 

981 

1 

OTHER 

6 

0 

23 

5 

35 

32 

108 

0 

134 

147 

161 

38 

670 

0 

96 

13 

125 

0 

9 

3 

21 

2138 

3 

9 

3 

123 

32 

0 

4 

0 

27 

180 

406 

69 

9 

21 

96 

1059 

17 

272 

12 

157 

291 

116 

2 

157 

205 

15 

43 

73 
910117 

NASA 

******* SUBJECT TERM ******* 

DIRICHLET PROBLEM 

DISCHARGE 

DISCHARGE 

DISASTERS 

DISARMAMENT 

DIRT 

COEFFICIENT 

DISCONNECT 

DISCOLORATION 

DISCIPLINING 

DISCHARGERS 

DEVICES 

DISCONTINUITY 

COMBINED 

DISCOS (SATELLITE ATTITUDE CONTROL) 

DISCOVERER RECOVERY CAPSULES 

DISCOVERER SATELLITES 

DISCOVERY (ORBITER) 

DISCRETE ADDRESS BEACON SYSTEM 

DISCRETE FUNCTIONS 

DISCRIMINANT ANALYSIS (STATISTICS) 

DISK 

DISINTEGRATION 

DISILICIDES 

DISEASES 

DISCUSSION 

DISCRIMINATORS 

DISCRIMINATION 

GALAXIES 

DISK OPERATING SYSTEM (DOS) 

DISKS 

DISKS 

(SHAPES) 

DISLOCATIONS (MATERIALS) 

DISPLACEMENT 

DISPLACEMENT 

DISPERSIONS 

DISPERSION 

DISPERSING 

DISPENSERS 

DISORIENTATION 

DISORDERS 

MEASUREMENT 

DISPLAY DEVICES 

DISSOLVED 

DISSOCIATION 

DISSIPATION 

DISSECTION 

DISRUPTING 

DISPOSAL 

GASES 

DISTANCE 

DISTANCE 

DISSOLVING 

MEASURING EQUIPMENT 

DISTILLATION 

DISTILLATION 

EQUIPMENT 

DISTORTION 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

331 

STAR 

17 

26 

138 

55 

108 

22 

3 

85 

28 

533 

4 

4 

88 

222 

104 

887 

10 

98 

222 

8 

54 

39 

73 

75 

475 

388 

47 

102 

53 

445 

152 

519 

1562 

354 

5461 

24 

25 

38 

671 

416 

62 

351 

338 

588 

262 

84 

777 

STATISTICS 

IAA 

1271 

52 

64 

35 

11 

161 

23 

8 

16 

20 

1060 

5 

2 

9 

33 

10 

1867 

56 

94 

295 

2 

735 

106 

112 

127 

9 

155 

1311 

734 

22 

89 

33 

370 

436 

285 

5453 

2185 

3007 

6 

14 

18 

576 

334 

37 

160 

1247 

102 

778 

46 

403 

37 

NLN 

0 

68 

47 

4 

0 

9 

2 

0 

1 

11 

0 

0 

0 

0 

0 

111 

3 

47 

6 

3 

698 

8 

4 

0 

1 

2 

0 

36 

105 

4 

15 

47 

56 

17 

27 

356 

14 

5 

9 

0 

30 

7 

1 

42 

18 

23 

7 

15 

OTHER 

32 

14 

82 

113 

31 

45 

41 

2 

22 

186 

275 

8 

3 

3 

23 

89 

254 

25 

124 

201 

12 

445 

13 

38 

11 

8 

46 

183 

241 

39 

25 

166 

636 

282 

135 

370 

196 

5198 

129 

13 

10 

317 

209 

34 

296 

419 

748 

188 

42 

651 

1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM **"'"'-*** TYPE STAR IAA NLN OTHER 

DISTRIBUTED AMPLIFIERS N 34 109 0 27 

DISTRIBUTED FEEDBACK LASERS N 15 263 0 8 

DISTRIBUTED PARAMETER SYSTEMS N 447 1434 55 155 

DISTRIBUTED PROCESSING N 829 648 82 341 

DISTRIBUTING N 56 14 16 32 

DISTRIBUTION N 116 23 20 202 

DISTRIBUTION (PROPERTY) N 594 399 26 305 

DISTRIBUTION FUNCTIONS N 2220 5562 94 869 

DISTRIBUTION MOMENTS N 157 191 11 43 

DISTRIBUTORS N 13 14 5 36 

DISTRICT OF COLUMBIA N 117 31 37 77 

DISTURBANCES N 61 153 5 34 

DISTURBING FUNCTIONS N 81 265 2 15 

DISULFIDES N 47 79 0 12 

DITCHES N 8 3 0 6 

DITCHING N 3 3 0 4 

DITCHING (LANDING) N 29 41 2 43 

DITHERS N 11 57 0 6 

DIURESIS N 33 88 0 17 

DIURETICS N 10 28 1 7 

DIURNAL VARIATIONS N 2454 7822 14 1435 1

DIVERGENCE N 329 601 4 103 

DIVERGENT NOZZLES N 28 78 0 31 

DIVERTERS N 92 136 0 38 

DIVIDERS N 19 65 1 18 

DIVIDES (LANDFORMS) N 4 2 0 0 

DIVIDING (MATHEMATICS) N 60 33 5 15 

DIVING (UNDERWATER) N 343 102 50 297 

DIVISION N 8 9 1 5 

DJIBOUTI N 1 6 0 0 

DMSP SATELLITES N 50 109 0 25 

D0-27 AIRCRAFT N 10 1 0 2 

D0-28 AIRCRAFT N 27 14 0 3 

D0-31 AIRCRAFT N 31 16 0 3 

DOCUMENT STORAGE N 262 43 50 326 

DOCUMENTATION N 1143 300 394 1181 

DOCUMENTS N 639 87 470 919 

DODGE SATELLITE N 9 11 0 8 

DOGHOUSES (ELECTRONICS) N 0 1 0 1 

DOGS N 385 1107 4 230 

DOLLIES N 4 0 0 19 

DOLOMITE (MINERAL) N 46 31 4 36 

DOLPHINS N 40 9 6 23 

DOMAIN WALL N 86 120 4 87 

DOMAINS N 296 375 27 111 

DOMES N 3 22 1 6 

DOMES (GEOLOGY) N 33 20 4 23 

DOMES (STRUCTURAL FORMS) N 65 132 6 160 

DOMESTIC ENERGY N 270 1187 31 233 

DOMESTIC SATELLITE COMMUNICATIONS SYSTEMS N 56 863 2 25 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*'****** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

DOMINANCE N 15 18 6 4 

DOMINICA N 2 0 3 1 

DOMINICAN REPUBLIC N 9 9 1 6 

DOMINO PROPELLANTS N 0 0 0 22 

DONNELL EQUATIONS N 22 175 0 16 

DONOR MATERIALS N 127 433 6 27 

DOORS N 83 65 6 168 

DOPA N 3 18 1 0 

DOPED CRYSTALS N 707 2504 15 312 

DOPES N 93 69 0 49 

DOPPLER EFFECT N 2087 4930 40 1314 

DOPPLER NAVIGATION N 184 359 17 261 

DOPPLER RADAR N 1153 2117 29 1234 

DOPPLER-FIZEAU EFFECT N 17 16 0 8 

DORNIER AIRCRAFT N 13 74 0 8 

DORNIER PARAGLIDER ROCKET VEHICLE N 3 0 0 0 

DORSAL SECTIONS N 6 15 1 1 

DOSAGE N 257 136 17 371 

DOSIMETERS N 917 242 68 449 

DOUBLE BASE PROPELLANTS N 82 173 1 241 

DOUBLE BASE ROCKET PROPELLANTS N 75 136 1 212 

DOUBLE CUSPS N 13 81 2 2 

DOUBLE PRECISION ARITHMETIC N 19 36 4 27 

DOUBLE SIDEBAND TRANSMISSION N 19 49 0 8 

DOUBLE STARS N 9 112 5 7 

DOUGLAS AIRCRAFT N 8 28 6 14 

DOWN-CONVERTERS N 36 176 0 25 

DOWNLINK I NG N 221 423 7 100 

DOWNRANGE N 4 5 0 9 

DOWNRANGE ANTIMISSILE MEASUREMENT PROGRAM N 0 0 0 8 

DOWNRANGE MEASUREMENT N 0 1 0 11 

DOWNTIME N 46 44 1 59 

DOWNWASH N 213 232 1 115 

DRACONID METEOROIDS N 2 34 0 1 

DRAFT N 1 5 1 0 

DRAFT (GAS FLOW) N 23 22 3 8 

DRAFTING (DRAWING) N 47 42 74 53 

DRAFTING MACHINES N 36 17 7 15 

DRAG N 808 692 28 756 

DRAG CHUTES N 86 75 0 144 

DRAG COEFFICIENTS N 13 200 1 13 

DRAG DEVICES N 27 25 1 27 

DRAG FORCE ANEMOMETERS N 10 2 0 4 

DRAG MEASUREMENT N 245 343 1 167 

DRAG REDUCTION N 740 1079 29 667 

DRAINAGE N 620 121 55 608 

DRAINAGE PATTERNS N 274 117 6 137 

DRAWING N 12 31 11 22 

DRAWINGS N 107 33 70 124 

DREAMS N 4 17 14 4 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

DREDGED MATERIALS N 40 3 9 85 

DREDGING N 4 5 0 7 

DRIFT N 59 174 2 49 

DRIFT (INSTRUMENTATION) N 272 536 3 149 

DRIFT RATE N 446 1715 4 171 

DRILL BITS N 41 11 0 63 

DRILLING N 515 272 80 595 

DRILLS N 82 27 8 123 

DRINKING N 28 43 9 22 

DRIVES N 27 36 4 37 

DRONE AIRCRAFT N 49 98 14 228 

DRONE VEHICLES N 13 21 3 107 

DROOPED AIRFOILS N 5 7 0 5 

DROP N 7 4 0 26 

DROP CALORIMETERS N 9 4 0 4 

DROP SIZE N 661 1813 8 299 

DROP TESTS N 268 311 1 384 

DROP TOWERS N 61 61 0 54 

DROP TRANSFER N 7 139 1 3 

DROPOUTS N 5 10 1 8 

DROPS (LIQUIDS) N 1129 2300 20 678 

DROPSONDES N 57 45 0 21 

DROSOPHILA N 29 73 5 42 

DROUGHT N 188 120 10 80 

DRUGS N 331 392 443 564 

DRUMS N 4 12 0 9 

DRUMS (CONTAINERS) N 53 11 1 33 

DRY CELLS N 48 33 5 76 

DRY FRICTION N 82 364 6 34 

DRY HEAT N 92 68 0 50 

DRYDOCKS N 5 0 6 11 

DRYING N 240 79 21 212 

DRYING APPARATUS N 67 32 8 81 

DTL INTEGRATED CIRCUITS N 4 13 1 6 

DUAL AIR DENSITY EXPLORER N 2 0 0 2 

DUAL SPIN SPACECRAFT N 36 223 0 9 

DUAL THRUST NOZZLES N 15 23 0 57 

DUAL WING CONFIGURATIONS N 2 8 0 2 

DUALITY PRINCIPLE N 15 43 0 7 

DUALITY THEOREM N 59 32 1 7 

DUCT GEOMETRY N 72 203 0 36 

DUCTED BODIES N 52 54 0 27 

DUCTED FAN ENGINES N 27 56 3 28 

DUCTED FANS N 106 92 6 54 

DUCTED FLOW N 445 2205 9 210 

DUCTED ROCKET ENGINES N 29 23 0 198 

DUCT! LI TY N 1374 2632 35 605 

DUCTS N 446 189 18 456 

DUFFING DIFFERENTIAL EQUATION N 27 249 1 4 

DUMMIES N 110 61 1 75 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBuECT TERM ******* TYPE STAR IAA NLN OTHER 

DUMP COMBUSTORS N 72 123 0 49 

DUMPING N 49 31 2 51 

DUNALIELLA N 2 1 0 1 

DUNES N 91 62 8 46 

DUNITE N 10 35 0 3 

DUOCHROMATORS N 11 3 0 1 

DUOPLASMATRONS N 45 51 0 9 

DUPLEX OPERATION N 31 26 0 7 

DUPLEXERS N 27 46 3 77 

DURABILITY N 492 359 18 431 

DURENE N 8 0 0 4 

DUST N 857 856 62 788 

DUST COLLECTORS N 137 157 16 81 

DUST STORMS N 87 316 4 65 

DWARF GALAXIES N 14 499 0 1 

DWARF NOVAE N 53 463 0 9 

DWARF STARS N 183 1520 16 112 

DWELL N 27 22 0 11 

DYADICS N 49 152 1 9 

DYE LASERS N 701 2261 17 367 

DYES N 417 568 45 347 

DYNAMIC CHARACTERISTICS N 2706 3971 320 1932 

DYNAMIC CONTROL N 561 2333 77 329 

DYNAMIC LOADS N 1137 2444 44 733 

DYNAMIC MODELS N 2164 5470 67 1029 

DYNAMIC MODULUS OF ELASTICITY N 76 191 0 28 

DYNAMIC PRESSURE N 370 601 5 314 

DYNAMIC PROGRAMMING N 714 917 128 334 

DYNAMIC RESPONSE N 3829 4243 96 1958 1

DYNAMIC STABILITY N 894 3500 67 615 

DYNAMIC STRUCTURAL ANALYSIS N 2846 6778 258 1238 1

DYNAMIC TESTS N 522 812 37 445 

DYNAMICAL SYSTEMS N 427 1702 146 102 

DYNAMICS N 81 138 149 118 

DYNAMICS EXPLORER SATELLITES N 36 90 1 53 

DYNAMICS EXPLORER 1 SATELLITE N 19 131 0 10 

DYNAMICS EXPLORER 2 SATELLITE N 10 83 0 1 

DYNAMITE N 0 5 1 2 

DYNAMO THEORY N 91 1507 15 19 

DYNAMOMETERS N 187 138 3 109 

DYNODES N 26 49 0 30 

DYSON THEORY N 17 54 1 5 

DYSPNEA N 2 9 0 5 

DYSPROSIUM N 68 77 1 31 

DYSPROSIUM COMPOUNDS N 15 37 0 9 

DYSPROSIUM ISOTOPES N 19 7 0 7 

E GLASS N 16 82 0 5 

E REGION N 526 1998 5 284 

E- 1 LAYER N 2 3 0 2 

E-2 AIRCRAFT N 13 14 0 98 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

E-2 LAYER N 3 11 0 0 

E-3A AIRCRAFT N 7 12 0 43 

E-4A AIRCRAFT N 6 4 0 70 

EAI 680 COMPUTER N 3 0 0 0 

EAI 8400 COMPUTER N 1 2 0 2 

EAI 8900 COMPUTER N 0 0 0 2 

EAR N 135 145 41 102 

EAR PRESSURE TEST N 8 22 0 3 

EAR PROTECTORS N 102 43 3 123 

EARDRUMS N 16 36 0 5 

EARLY BIRD SATELLITES N 10 27 1 7 

EARLY STARS N 91 2307 12 49 

EARLY WARNING SYSTEMS N 80 99 2 825 

EARPHONES N 53 28 4 66 

EARTH (PLANET) N 827 716 461 868 

EARTH & OCEAN PHYSICS APPLICATIONS PROGRAM N 5 4 0 0 

EARTH ALBEDO N 282 790 2 96 

EARTH ATMOSPHERE N 1653 2340 300 1513 

EARTH AXIS N 56 235 5 24 

EARTH CORE N 154 764 29 84 

EARTH CRUST N 1334 1125 116 745 

EARTH ENVIRONMENT N 108 331 54 130 

EARTH GRAVITATION N 379 450 83 254 

EARTH HYDROSPHERE N 126 193 39 62 

EARTH IONOSPHERE N 1735 1863 171 1101 

EARTH LIMB N 49 95 0 50 

EARTH MAGNETOSPHERE N 2134 6207 117 944 

EARTH MANTLE N 534 1382 48 307 

EARTH MOTION N 49 177 9 40 

EARTH MOVEMENTS N 601 285 60 454 

EARTH OBSERVATIONS (FROM SPACE) N 623 1561 54 487 

EARTH OBSERVING SYSTEM (EOS) N 89 129 0 122 

EARTH ORBITAL ENVIRONMENTS N 177 968 0 66 

EARTH ORBITAL RENDEZVOUS N 33 45 1 45 

EARTH ORBITS N 891 1205 26 840 

EARTH ORIENTATION N 20 42 0 10 

EARTH PLANETARY STRUCTURE N 468 628 94 236 

EARTH RADIATION BUDGET N 134 305 0 45 

EARTH RADIATION BUDGET EXPERIMENT N 123 171 1 90 

EARTH RESOURCES N 2825 1466 625 1906 

EARTH RESOURCES INFORMATION SYSTEM N 49 38 10 30 

EARTH RESOURCES PROGRAM N 6386 549 35 447 

EARTH RESOURCES SHUTTLE IMAGING RADAR N 4 13 0 3 

EARTH RESOURCES SURVEY AIRCRAFT N 99 51 6 38 

EARTH RESOURCES SURVEY PROGRAM N 60 51 6 73 

EARTH ROTATION N 329 1495 43 220 

EARTH SURFACE N 1034 2928 58 640 

EARTH TERMINAL MEASUREMENT SYSTEM N 5 8 0 0 

EARTH TERMINALS N 115 342 5 141 

EARTH TIDES N 130 278 15 60 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ****-*'** TYPE STAR IAA NLN OTHER 

EARTH VIEWING APPLICATIONS LABORATORY N 5 2 0 25 

EARTH-MARS TRAJECTORIES N 51 150 0 31 

EARTH-MERCURY TRAJECTORIES N 1 8 0 1 

EARTH-MOON SYSTEM N 115 821 13 57 

EARTH-MOON TRAJECTORIES N 42 145 7 73 

EARTH-VENUS TRAJECTORIES N 21 41 0 9 

EARTHNET N 6 16 1 0 

EARTHQUAKE DAMAGE N 123 10 17 86 

EARTHQUAKE RESISTANCE N 66 5 5 39 

EARTHQUAKE RESISTANT STRUCTURES N 216 9 26 146 

EARTHQUAKES N 1580 544 217 1559 

EASEP N 1 1 0 0 

EAST GERMANY N 64 75 8 90 

EASTERN HEMISPHERE N 1 6 0 1 

EATING N 21 29 7 21 

EBERT SPECTROMETERS N 22 47 0 7 

EC-121 AIRCRAFT N 0 0 0 1 

ECCENTRIC ORBITS N 79 897 0 23 

ECCENTRICITY N 244 983 1 77 

ECCENTRICS N 23 23 4 21 

ECHELETTE GRATINGS N 24 58 0 8 

ECHELLE GRATINGS N 33 120 0 10 

ECHO PROJECT N 2 4 0 4 

ECHO SATELLITES N 10 29 1 15 

ECHO SOUNDING N 91 235 3 68 

ECHO SUPPRESSORS N 29 116 0 10 

ECHO 1 SATELLITE N 23 27 0 7 

ECHO 2 SATELLITE N 31 31 1 7 

ECHOCARDIOGRAPHY N 53 231 8 21 

ECHOENCEPHALOGRAPHY N 7 3 0 2 

ECHOES N 242 520 5 176 

ECLIPSE PROJECT N 1 2 0 1 

ECLIPSES N 107 230 20 72 

ECLIPSING BINARY STARS N 171 2664 16 170 

ECLIPTIC N 90 247 3 37 

ECLOGITE N 3 26 0 5 

ECOLOGY N 1312 558 912 1115 

ECONOMETRICS N 142 38 38 95 

ECONOMIC ANALYSIS N 3128 2223 396 2189 

ECONOMIC DEVELOPMENT N 416 149 268 407 

ECONOMIC FACTORS N 2454 2845 841 1604 

ECONOMIC IMPACT N 541 173 55 411 

ECONOMICS N 1711 623 1066 1477 

ECONOMY N 223 109 153 152 

ECOSYSTEMS N 733 251 159 566 

ECUADOR N 12 4 3 16 

EDDINGTON APPROXIMATION N 48 245 0 11 

EDDY CURRENTS N 596 931 21 338 

EDDY VISCOSITY N 316 1060 3 84 

EDEMA N 47 101 6 26 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

EDGE DETECTION N 23 30 0 2 

EDGE DISLOCATIONS N 179 861 6 55 

EDGE LOADING N 143 1037 1 26 

EDGES N 546 683 4 236 

EDITING N 213 39 54 143 

EDITING ROUTINES (COMPUTERS) N 285 39 9 110 

EDUCATION N 2485 817 1711 2603 

EDUCATIONAL TELEVISION N 65 186 22 53 

EFFECTIVE PERCEIVED NOISE LEVELS N 193 94 9 60 

EFFECTIVENESS N 203 89 101 336 

EFFECTORS N 0 1 0 0 

EFFECTS N 44 8 11 138 

EFFERENT NERVOUS SYSTEMS N 204 430 19 123 

EFFERVESCENCE N 0 4 0 3 

EFFICIENCY N 2158 541 109 1488 

EFFLUENTS N 478 192 58 356 

EFFLUX N 13 24 0 9 

EFFORT N 17 6 0 8 

EFFUSIVES N 28 18 1 15 

EGGS N 100 59 8 52 

EGO N 0 3 0 10 

EGRESS N 22 34 1 46 

EGYPT N 84 133 11 36 

EIGENVALUES N 2648 7973 158 740 1

EIGENVECTORS N 1227 2848 56 339 

EIKONAL EQUATION N 60 139 1 18 

EINSTEIN EQUATIONS N 203 2052 31 80 

EINSTEINIUM N 3 2 0 2 

EINSTEINIUM COMPOUNDS N 0 2 0 0 

EISCAT RADAR SYSTEM (EUROPE) N 70 247 0 4 

EJECTA N 129 308 0 57 

EJECTION N 156 175 2 310 

EJECTION INJURIES N 90 146 4 20 

EJECTION SEATS N 260 360 5 493 

EJECTION TRAINING N 10 16 1 15 

EJECTORS N 313 389 6 431 

EKMAN LAYER N 64 175 0 9 

EL NINO N 135 297 3 6 

EL SALVADOR N 11 1 2 1 

ELASTIC ANISOTROPY N 76 626 5 35 

E LA STI C BARS N 50 801 3 11 

ELASTIC BENDING N 150 1077 7 48 

ELASTIC BODIES N 397 3153 45 135 

ELASTIC BUCKLING N 233 1064 14 71 

ELASTIC CYLINDERS N 102 618 5 69 

ELASTIC DAMPING N 141 566 6 44 

ELASTIC DEFORMATION N 1112 5522 67 433 

ELASTIC MEDIA N 237 1749 15 92 

ELASTIC PLATES N 282 2738 44 94 

ELASTIC PROPERTIES N 3577 5819 522 1729 1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ELASTIC SCATTERING N 1612 1141 52 529 

ELASTIC SHEETS N 32 112 1 18 

ELASTIC SHELLS N 294 2034 50 116 

ELASTIC SYSTEMS N 34 439 10 8 

ELASTIC WAVES N 766 1963 66 381 

ELASTIN N 0 6 2 0 

ELASTODYNAMICS N 233 1673 34 63 

ELASTOHYDROOYNAMICS N 244 495 17 94 

ELASTOMERS N 876 607 1 14 1084 

ELASTOMETERS N 14 19 2 23 

E LA STOP LAST I CITY N 607 4452 37 197 

ELASTOSTATICS N 118 628 19 25 

ELBER EQUATION N 3 4 0 0 

ELBOW (ANATOMY) N 10 18 1 7 

ELDO LAUNCH VEHICLE N 179 107 2 282 

ELECTRA AIRCRAFT N 9 11 1 5 

ELECTRETS N 54 44 13 36 

ELECTRIC ARCS N 598 641 27 400 

ELECTRIC AUTOMOBILES N 168 116 18 128 

ELECTRIC BATTERIES N 1462 663 150 1309 

ELECTRIC BRIDGES N 252 517 20 181 

ELECTRIC CELLS N 46 25 2 39 

ELECTRIC CHARGE N 561 702 21 315 

ELECTRIC CHOPPERS N 91 129 4 54 

ELECTRIC COILS N 179 119 14 244 

ELECTRIC CONDUCTORS N 550 1348 65 371 

ELECTRIC CONNECTORS N 496 235 43 1284 

ELECTRIC CONTACTS N 598 906 53 612 

ELECTRIC CONTROL N 105 449 36 108 

ELECTRIC CORONA N 222 263 20 146 

ELECTRIC CURRENT N 2089 3557 143 1527 

ELECTRIC DIPOLES N 264 955 7 126 

ELECTRIC DISCHARGES N 1541 2649 86 1082 

ELECTRIC ENERGY STORAGE N 279 483 16 199 

ELECTRIC EQUIPMENT N 511 248 170 1028 

ELECTRIC EQUIPMENT TESTS N 240 164 27 970 

ELECTRIC FIELD STRENGTH N 290 1563 7 103 

ELECTRIC FIELDS N 4911 10759 160 2109 1

ELECTRIC FILTERS N 341 493 114 407 

ELECTRIC FURNACES N 23 11 2 13 

ELECTRIC FUSES N 55 19 6 132 

ELECTRIC GENERATORS N 1479 1163 188 1671 

ELECTRIC HYBRID VEHICLES N 183 16 7 90 

ELECTRIC IGNITION N 63 93 2 78 

ELECTRIC MOMENTS N 65 62 5 12 

ELECTRIC MOTOR VEHICLES N 547 420 34 230 

ELECTRIC MOTORS N 624 576 126 618 

ELECTRIC NETWORKS N 384 459 314 351 

ELECTRIC OUTLETS N 8 4 0 26 

ELECTRIC POTENTIAL N 2799 3673 81 2393 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ELECTRIC POWER N 349 867 147 408 

ELECTRIC POWER PLANTS N 2067 2178 263 1597 

ELECTRIC POWER SUPPLIES N 1044 1271 194 957 

ELECTRIC POWER TRANSMISSION N 593 330 157 492 

ELECTRIC PROPULSION N 573 872 44 519 

ELECTRIC PULSES N 382 1073 22 314 

ELECTRIC REACTORS N 7 17 4 26 

ELECTRIC RELAYS N 138 210 61 644 

ELECTRIC ROCKET ENGINES N 59 124 14 70 

ELECTRIC SPARKS N 168 424 12 90 

ELECTRIC STIMULI N 90 612 6 50 

ELECTRIC SWITCHES N 301 281 26 796 

ELECTRIC TERMINALS N 115 137 13 313 

ELECTRIC WELDING N 80 86 20 89 

ELECTRIC WIRE N 521 563 62 685 

ELECTRICAL CONDUCTIVITY METERS N 22 36 2 18 

ELECTRICAL ENGINEERING N 664 270 1452 850 

ELECTRICAL FAULTS N 842 1195 50 746 

ELECTRICAL GROUNDING N 170 32 24 90 

ELECTRICAL IMPEDANCE N 920 3315 19 590 

ELECTRICAL INSULATION N 885 563 112 1210 

ELECTRICAL MEASUREMENT N 1260 2267 112 839 

ELECTRICAL PROPERTIES N 3638 3574 433 4968 1

ELECTRICAL RESISTANCE N 999 2321 47 1330 

ELECTRICAL RESISTIVITY N 3814 6531 117 1967 1

ELECTRICITY N 476 38 367 355 

ELECTRIFICATION N 44 126 24 25 

ELECTRO-OPTICAL EFFECT N 80 508 4 36 

ELECTRO-OPTICAL PHOTOGRAPHY N 97 214 11 60 

ELECTRO-OPTICS N 1925 3447 324 2640 

ELECTROACOUSTIC TRANSDUCERS N 197 471 22 239 

ELECTROACOUSTIC WAVES N 99 217 37 35 

ELECTROACOUSTICS N 10 61 82 10 

ELECTROANESTHESIA N 10 2 2 0 

ELECTROCARDIOGRAPHY N 367 1402 86 219 

ELECTROCATALYSTS N 241 169 13 141 

ELECTROCHEMICAL CELLS N 742 872 29 448 

ELECTROCHEMICAL CORROSION N 372 629 22 191 

ELECTROCHEMICAL MACHINING N 79 217 10 66 

ELECTROCHEMICAL OXIDATION N 251 195 5 112 

ELECTROCHEMISTRY N 2495 878 473 1350 

ELECTROCHROMISM N 13 16 0 6 

ELECTROCUTANEOUS COMMUNICATION N 5 4 0 1 

ELECTRODE FILM BARRIERS N 45 43 0 25 

ELECTRODE MATERIALS N 61 470 1 19 

ELECTRODELESS DISCHARGES N 59 104 0 37 

ELECTRODEPOSITION N 583 448 52 312 

ELECTRODES N 3559 2470 170 2355 

ELECTRODIALYSIS N 46 12 7 40 

ELECTRDDISSOLUTION N 13 9 0 4 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ELECTRODYNAMICS N 540 1981 145 361 

ELECTROENCEPHALOGRAPHY N 479 1046 55 286 

ELECTROEPITAXY N 9 26 1 15 

ELECTROFORMING N 99 70 9 141 

ELECTROHYDRAULIC FORMING N 9 19 1 17 

ELECTROHYDRODYNAMICS N 163 412 14 87 

ELECTROJETS N 70 146 0 28 

ELECTROKINETICS N 98 82 8 54 

ELECTROLESS DEPOSITION N 23 48 2 18 

ELECTROLUMINESCENCE N 298 429 25 287 

ELECTROLYSIS N 738 827 42 428 

ELECTROLYTE METABOLISM N 87 297 10 33 

ELECTROLYTES N 1862 1045 166 1396 

ELECTROLYTIC CELLS N 646 560 16 470 

ELECTROLYTIC POLARIZATION N 50 71 1 25 

ELECTROMAGNETIC ABSORPTION N 1047 3619 42 468 

ELECTROMAGNETIC ACCELERATION N 39 195 0 23 

ELECTROMAGNETIC COMPATIBILITY N 646 767 95 1658 

ELECTROMAGNETIC COUPLING N 142 211 0 45 

ELECTROMAGNETIC ENVIRONMENT EXPERIMENT N 1 3 0 3 

ELECTROMAGNETIC FIELDS N 2094 4921 217 1141 

ELECTROMAGNETIC HAMMERS N 5 5 0 5 

ELECTROMAGNETIC INTERACTIONS N 643 1466 55 258 

ELECTROMAGNETIC INTERFERENCE N 992 1763 71 1019 

ELECTROMAGNETIC MEASUREMENT N 352 1101 42 193 

ELECTROMAGNETIC NOISE N 858 1704 84 629 

ELECTROMAGNETIC NOISE MEASUREMENT N 36 359 3 15 

ELECTROMAGNETIC PROPERTIES N 447 238 31 606 

ELECTROMAGNETIC PROPULSION N 75 165 2 54 

ELECTROMAGNETIC PULSES N 951 1444 21 2069 

ELECTROMAGNETIC PUMPS N 60 90 4 45 

ELECTROMAGNETIC RADIATION N 2730 3867 311 2473 

ELECTROMAGNETIC SCATTERING N 1031 3226 33 449 

ELECTROMAGNETIC SHIELDING N 321 416 24 411 

ELECTROMAGNETIC SPECTRA N 201 280 34 201 

ELECTROMAGNETIC SURFACE WAVES N 90 479 8 32 

ELECTROMAGNETIC WAVE FILTERS N 152 234 13 145 

ELECTROMAGNETIC WAVE TRANSMISSION N 1065 2647 78 611 

ELECTROMAGNETISM N 508 244 330 425 

ELECTROMAGNETS N 262 256 20 263 

ELECTROMECHANICAL DEVICES N 387 619 97 373 

ELECTROMECHANICS N 120 134 52 98 

ELECTROMETERS N 71 62 5 66 

ELECTROMIGRATION N 59 101 8 21 

ELECTROMOTIVE FORCES N 197 572 10 103 

ELECTROMYOGRAPHY N 111 336 19 60 

ELECTRON ACCELERATION N 94 489 1 39 

ELECTRON ACCELERATORS N 566 473 8 356 

ELECTRON AFFINITY N 44 93 1 0 

ELECTRON ATTACHMENT N 89 250 1 38 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER T

ELECTRON AVALANCHE N 85 446 2 37 

ELECTRON BEAM WELDING N 290 501 28 354 

ELECTRON BEAMS N 3620 7074 153 2550 1

ELECTRON BOMBARDMENT N 454 570 14 215 

ELECTRON BUNCHING N 185 464 0 49 

ELECTRON CAPTURE N 331 758 7 121 

ELECTRON CLOUDS N 44 126 1 14 

ELECTRON COUNTERS N 89 147 7 51 

ELECTRON CYCLOTRON HEATING N 230 317 0 39 

ELECTRON DECAY RATE N 96 117 1 25 

ELECTRON DENSITY (CONCENTRATION) N 2649 6528 24 1051 1

ELECTRON DENSITY PROFILES N 600 2408 7 257 3

ELECTRON DIFFRACTION N 563 1172 76 243 2

ELECTRON DIFFUSION N 178 955 10 40 

ELECTRON DISTRIBUTION N 549 2478 18 217 3

ELECTRON EMISSION N 697 1108 36 350 2

ELECTRON ENERGY N 2571 11261 33 836 1

ELECTRON FLUX DENSITY N 300 1512 1 97 

ELECTRON GAS N 207 856 13 54 

ELECTRON GUNS N 533 588 16 658 

ELECTRON IMPACT N 357 1582 10 163 2

ELECTRON IRRADIATION N 639 801 5 270 

ELECTRON MASS N 36 125 0 15 

ELECTRON MICROSCOPES N 1470 2124 262 894 4

ELECTRON MICROSCOPY N 2105 5005 151 898 8

ELECTRON MOBILITY N 434 1235 17 185 

ELECTRON OPTICS N 155 531 74 213 

ELECTRON ORBITALS N 182 599 9 102 

ELECTRON OSCILLATIONS N 130 660 3 55 

ELECTRON PARAMAGNETIC RESONANCE N 860 523 113 392 

ELECTRON PHONON INTERACTIONS N 133 564 12 38 

ELECTRON PHOTOGRAPHY N 9 36 2 11 

ELECTRON PHOTON CASCADES N 124 486 3 28 

ELECTRON PLASMA N 421 2754 3 146 

ELECTRON PRECIPITATION N 347 1926 5 76 2

ELECTRON PRESSURE N 21 79 0 7 

ELECTRON PROBES N 156 458 39 108 

ELECTRON PUMPING N 94 840 2 44 

ELECTRON RADIATION N 150 425 10 89 

ELECTRON RECOMBINATION N 98 763 2 36 

ELECTRON RUNAWAY (PLASMA PHYSICS) N 19 93 1 0 

ELECTRON SCATTERING N 1457 4039 95 589 

ELECTRON SOURCES N 132 160 6 117 

ELECTRON SPECTROSCOPY N 536 517 41 220 

ELECTRON SPIN N 225 307 42 116 

ELECTRON STATES N 750 1587 31 230 

ELECTRON TRAJECTORIES N 132 531 2 45 

ELECTRON TRANSFER N 698 729 46 240 

ELECTRON TRANSITIONS N 1457 4156 42 480 

ELECTRON TUBES N 320 186 59 558 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ELECTRON TUNNELING N 594 1243 28 167 

ELECTRON-HOLE DROPS N 11 51 1 4 

ELECTRON-ION RECOMBINATION N 102 660 1 40 

ELECTRON-POSITRON PAIRS N 73 233 0 9 

ELECTRON-POSITRON PLASMAS N 34 134 0 8 

ELECTRONARCOSIS N 3 1 0 1 

ELECTRONIC AIRCRAFT N 23 93 0 229 

ELECTRONIC CONTROL N 413 2065 95 444 

ELECTRONIC COUNTERMEASURES N 292 630 26 3551 

ELECTRONIC EQUIPMENT N 3198 2249 1550 5673 1

ELECTRONIC EQUIPMENT TESTS N 894 2209 91 2616 

ELECTRONIC FILTERS N 123 602 15 136 

ELECTRONIC MAIL N 48 15 7 17 

ELECTRONIC MODULES N 638 969 17 1556 

ELECTRONIC PACKAGING N 568 960 121 738 

ELECTRONIC RECORDING SYSTEMS N 68 141 5 46 

ELECTRONIC SPECTRA N 227 403 29 121 

ELECTRONIC TRANSDUCERS N 130 328 15 123 

ELECTRONIC WARFARE N 96 324 9 601 

ELECTRONICS N 270 270 774 483 

ELECTRONOGRAPHY N 25 205 6 10 

ELECTRONS N 2367 725 285 1340 

ELECTRONYSTAGMOGRAPHY N 20 53 3 3 

ELECTROPHORESIS N 432 448 81 536 

ELECTROPHOTOMETERS N 132 925 11 163 

ELECTROPHOTOMETRY N 79 1856 11 48 

ELECTROPHYSICS N 93 106 74 125 

ELECTROPHYSIOLOGY N 313 707 89 224 

ELECTROPLATING N 426 277 73 337 

ELECTROPLETHYSMOGRAPHY N 7 40 0 4 

ELECTROPOLISHING N 69 114 9 55 

ELECTROREFINING N 29 29 3 17 

ELECTRORETINOGRAPHY N 33 155 4 16 

ELECTRORHEOLOGICAL FLUIDS N 2 1 0 1 

ELECTROSLAG PROCESS N 14 8 2 10 

ELECTROSLAG REFINING N 76 43 1 88 

ELECTROSLAG WELDING N 38 33 2 57 

ELECTROSTATIC BONDING N 17 13 0 6 

ELECTROSTATIC CHARGE N 476 451 23 287 

ELECTROSTATIC DRAG N 11 14 1 2 

ELECTROSTATIC ENGINES N 45 54 0 16 

ELECTROSTATIC GENERATORS N 41 28 5 35 

ELECTROSTATIC GYROSCOPES N 38 73 0 61 

ELECTROSTATIC PRECIPITATORS N 199 119 21 100 

ELECTROSTATIC PROBES N 684 1606 7 311 

ELECTROSTATIC PROPULSION N 73 78 5 37 

ELECTROSTATIC SHIELDING N 57 72 2 31 

ELECTROSTATIC WAVES N 297 2462 9 82 

ELECTROSTATICS N 872 956 116 538 

ELECTROSTRICTION N 56 94 2 19 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ELECTROTHERMAL ENGINES N 74 160 2 54 

ELECTROWINNING N 39 4 5 10 

ELEKTRON SATELLITES N 29 35 0 1 

ELEKTRON 1 SATELLITE N 2 3 0 0 

ELEKTRON 2 SATELLITE N 5 20 0 1 

ELEKTRON 4 SATELLITE N 7 17 0 0 

ELEMENT 104 N 2 0 0 1 

ELEMENT 105 N 3 0 0 1 

ELEMENTARY EXCITATIONS N 190 135 25 48 

ELEMENTARY PARTICLE INTERACTIONS N 791 766 43 172 

ELEMENTARY PARTICLES N 851 380 175 370 

ELEMENTS N 20 20 12 42 

ELEVATION N 287 152 2 212 

ELEVATION ANGLE N 255 419 0 126 

ELEVATOR ILLUSION N 0 3 0 0 

ELEVATORS (CONTROL SURFACES) N 81 93 2 43 

ELEVATORS (LIFTS) N 27 21 10 22 

ELEVONS N 113 36 0 161 

ELIMINATION N 69 29 7 84 

ELLIPSES N 150 233 2 70 

ELLIPSOIDS N 296 1035 10 221 

ELLIPSOMETERS N 156 176 15 75 

ELLIPSOMETRY N 4 3 0 0 

ELLIPTIC DIFFERENTIAL EQUATIONS N 419 1618 64 89 

ELLIPTIC FUNCTIONS N 207 629 69 70 

ELLIPTICAL CYLINDERS N 74 435 1 30 

ELLIPTICAL GALAXIES N 81 2096 2 13 

ELLIPTICAL ORBITS N 223 1109 6 157 

ELLIPTICAL PLASMAS N 6 13 0 1 

ELLIPTICAL POLARIZATION N 42 395 0 15 

ELLIPTICITY N 141 602 5 47 

ELONGATION N 359 493 3 326 

ELUTION N 97 30 5 49 

EMBEDDED COMPUTER SYSTEMS N 161 267 0 57 

EMBEDDING N 282 129 12 196 

EMBOLISMS N 16 27 1 17 

EMBOSSING N 0 1 0 2 

EMBR ITT LEMENT N 637 623 30 338 

EMBRYOLOGY N 72 102 75 58 

EMBRYOS N 97 86 7 71 

EMERGENCIES N 387 361 129 542 

EMERGENCY BREATHING TECHNIQUES N 12 15 2 10 

EMERGENCY LIFE SUSTAINING SYSTEMS N 102 164 16 91 

EMERGENCY LOCATOR TRANSMITTERS N 35 40 1 26 

EMERGING N 0 2 1 2 

EMISSION N 662 68 100 736 

EMISSION SPECTRA N 3433 13531 102 1295 1

EMISSIVITY N 394 927 6 328 

EMITTANCE N 289 336 2 117 

EMITTERS N 260 470 8 317 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

EMOTIONAL FACTORS N 143 415 34 70 

EMOTIONS N 56 56 39 58 

EMPHYSEMA N 12 13 6 6 

EMPLOYEE RELATIONS N 74 40 448 64 

EMPLOYMENT N 164 25 864 254 

EMPTYING N 2 11 1 13 

EMR 6050 COMPUTER N 2 0 0 0 

EMULSIONS N 265 139 53 180 

ENAMELS N 49 55 13 51 

ENARGITE N 1 0 0 0 

ENCAPSULATED MICROCIRCUITS N 39 21 1 11 

ENCAPSULATING N 500 346 22 678 

ENCELADUS N 10 53 0 1 

ENCEPHALITIS N 8 7 0 20 

ENCKE COMET N 11 57 0 0 

ENCKE METHOD N 14 43 2 8 

ENCLOSURE N 31 19 1 16 

ENCLOSURES N 110 144 9 72 

ENCOUNTERS N 10 136 3 4 

END EFFECTORS N 256 369 0 65 

END PLATES N 37 80 1 25 

END-TO-END DATA SYSTEMS N 34 27 0 21 

ENDANGERED SPECIES N 18 4 4 14 

ENDEAVOUR (ORBITER) N 0 0 0 0 

ENDFIRE ARRAYS N 14 67 2 16 

ENDOCRINE GLANDS N 26 26 50 43 

ENDOCRINE SECRETIONS N 62 85 18 25 

ENDOCRINE SYSTEMS N 74 90 57 33 

ENDOCRINOLOGY N 61 218 176 70 

ENDOLYMPH N 19 41 0 2 

ENDOPLASMIC RETICULUM N 2 1 0 0 

ENDORADIOSONDES N 1 0 0 0 

ENDOSCOPES N 12 33 2 30 

ENDOTHELIUM N 10 47 4 24 

ENDOTHERMIC FUELS N 5 5 0 9 

ENDOTHERMIC REACTIONS N 73 148 0 45 

ENDOTOXINS N 13 17 1 36 

ENDRIN N 1 0 0 1 

ENDURANCE N 14 104 2 20 

ENEMY PERSONNEL N 7 2 0 53 

ENERGETIC PARTICLES N 451 2378 18 282 

ENERGY N 180 81 115 178 

ENERGY ABSORPTION N 581 1105 7 332 

ENERGY ABSORPTION FILMS N 149 329 13 95 

ENERGY BANDS N 360 744 59 106 

ENERGY BUDGETS N 468 1199 18 192 

ENERGY CONSERVATION N 2911 1265 498 2405 

ENERGY CONSUMPTION N 1893 694 232 1403 

ENERGY CONVERSION N 2326 1421 406 1778 

ENERGY CONVERSION EFFICIENCY N 2108 8933 50 998 1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ENERGY DISSIPATION N 1668 8996 23 712 1

ENERGY DISTRIBUTION N 1243 3655 24 445 

ENERGY GAPS (SOLID STATE) N 316 1217 5 86 

ENERGY LEVELS N 1987 1471 44 834 

ENERGY METHODS N 121 1584 19 47 

ENERGY OF FORMATION N 70 102 5 39 

ENERGY POLICY N 4919 1114 725 2982 

ENERGY REQUIREMENTS N 994 1116 181 716 

ENERGY SOURCES N 1134 1544 486 713 

ENERGY SPECTRA N 2028 7946 41 607 1

ENERGY STORAGE N 2426 2202 182 1373 

ENERGY TECHNOLOGY N 4888 13500 699 2927 2

ENERGY TRANSFER N 2927 5972 150 1386 1

ENGINE AIRFRAME INTEGRATION N 60 231 2 124 

ENGINE ANALYZERS N 53 29 1 51 

ENGINE CONTROL N 310 1012 26 350 

ENGINE COOLANTS N 87 248 8 74 

ENGINE DESIGN N 2328 5175 160 3022 1

ENGINE FAILURE N 332 556 7 349 

ENGINE INLETS N 528 898 2 917 

ENGINE MONITORING INSTRUMENTS N 204 530 5 76 

ENGINE NOISE N 713 1016 19 358 

ENGINE PARTS N 1009 1483 45 1473 

ENGINE PRIMERS N 3 3 0 6 

ENGINE STARTERS N 79 186 3 186 

ENGINE TESTING LABORATORIES N 89 107 3 92 

ENGINE TESTS N 1410 2945 41 2614 

ENGINEERING N 202 135 1249 409 

ENGINEERING DRAWINGS N 676 108 216 1247 

ENGINEERING MANAGEMENT N 314 248 263 259 

ENGINEERING TEST REACTORS N 24 27 2 15 

ENGINES N 233 49 66 836 

ENGLAND N 98 171 30 59 

ENGLISH CHANNEL N 11 28 3 3 

ENGLISH LANGUAGE N 172 30 678 115 

ENGRAVING N 28 13 2 30 

ENRICHMENT N 100 50 7 55 

ENRICO FERMI ATOMIC POWER PLANT N 9 0 2 10 

ENSTATITE N 17 173 0 12 

ENTERPRISE (ORBITER) N 7 7 1 18 

ENTHALPY N 1000 1606 51 548 

ENTIRE FUNCTIONS N 180 277 35 72 

ENTOMOLOGY N 27 9 33 25 

ENTRAINMENT N 465 570 5 147 

ENTRANCES N 14 16 4 10 

ENTRAPMENT N 15 4 0 13 

ENTROPY N 992 2630 117 470 

ENTROPY (STATISTICS) N 89 37 6 11 

ENTRY N 2 6 0 12 

ENTRY GUIDANCE (STS) N 5 7 0 7 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM •*•**** TYPE STAR IAA NLN OTHER 

ENUMERATION N 38 19 7 11 

ENVELOPES N 15 85 0 11 

ENVIRONMENT EFFECTS N 3237 2282 631 2224 

ENVIRONMENT MANAGEMENT N 396 152 286 389 

ENVIRONMENT MODELS N 454 304 34 459 

ENVIRONMENT POLLUTION N 858 660 320 649 

ENVIRONMENT PROTECTION N 1294 862 391 1114 

ENVIRONMENT SIMULATION N 626 1278 21 432 

ENVIRONMENT SIMULATORS N 109 124 1 78 

ENVIRONMENTAL CHEMISTRY N 67 21 80 108 

ENVIRONMENTAL CONTROL N 990 1111 184 1221 

ENVIRONMENTAL ENGINEERING N 499 451 402 460 

ENVIRONMENTAL INDEX N 23 11 3 16 

ENVIRONMENTAL LABORATORIES N 109 115 9 116 

ENVIRONMENTAL MONITORING N 1640 1197 319 974 

ENVIRONMENTAL QUALITY N 548 73 326 421 

ENVIRONMENTAL RESEARCH SATELLITES N 33 45 8 20 

ENVIRONMENTAL SURVEYS N 685 253 72 861 

ENVIRONMENTAL TESTS N 1968 2599 100 7735 1

ENVIRONMENTS N 555 92 200 1189 

ENZYME ACTIVITY N 401 1153 49 219 

ENZYMES N 451 224 269 666 

ENZYMOLOGY N 53 64 104 74 

EOLE SATELLITES N 30 42 2 15 

EOSINOPHILS N 5 10 1 7 

EPHEMERIDES N 304 600 155 268 

EPHEMERIS TIME N 77 301 30 52 

EPICARDIUM N 2 22 0 2 

EPICYCLOIDS N 6 30 0 1 

EPIDEMIOLOGY N 226 107 48 198 

EPIDERMIS N 12 20 1 11 

EPILEPSY N 17 57 7 15 

EPINEPHRINE N 62 207 2 42 

EPITAXY N 1084 1898 59 1226 

EPITHELIUM N 51 102 6 57 

EPOXIDATION N 5 9 0 13 

EPOXY COMPOUNDS N 441 229 13 499 

EPOXY MATRIX COMPOSITES N 357 1172 0 115 

EPOXY RESINS N 1567 2691 67 1788 

EQUALIZERS (CIRCUITS) N 50 262 7 26 

EQUATIONS N 188 50 28 196 

EQUATIONS OF MOTION N 6376 15919 234 2725 2

EQUATIONS OF STATE N 1597 3084 85 647 

EQUATORIAL ATMOSPHERE N 149 1273 1 44 

EQUATORIAL ELECTROJET N 84 578 2 19 

EQUATORIAL ORBITS N 89 217 0 68 

EQUATORIAL REGIONS N 214 324 2 83 

EQUATORS N 148 404 5 62 

EQUILIBRIUM N 320 514 57 238 

EQUILIBRIUM EQUATIONS N 418 3496 38 144 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER T

EQUILIBRIUM FLOW N 361 602 22 148 

EQUILIBRIUM METHODS N 87 256 19 30 

EQUINOXES N 67 346 6 25 

EQUIPARTITION THEOREM N 14 50 1 3 

EQUIPMENT N 114 21 81 254 

EQUIPMENT SPECIFICATIONS N 5370 1373 161 8552 1

EQUIPOTENTIALS N 46 232 1 17 

EQUIVALENCE N 248 404 16 74 

EQUIVALENT CIRCUITS N 380 3675 19 167 4

ERBIUM N 97 152 1 61 

ERBIUM ALLOYS N 16 35 0 6 

ERBIUM COMPOUNDS N 52 98 0 23 

ERBIUM ISOTOPES N 28 2 0 9 

EREP N 1343 43 2 52 

ERGODIC PROCESS N 162 353 46 50 

ERGOMETERS N 98 340 3 43 

ERGOTAMINE N 4 2 2 0 

EROS (SATELLITES) N 22 21 2 29 

EROSION N 1266 1275 77 1331 3

EROSIVE BURNING N 42 84 0 30 

ERROR ANALYSIS N 5632 19736 104 2706 28

ERROR CORRECTING CODES N 578 1009 36 214 

ERROR CORRECTING DEVICES N 593 1899 33 248 2

ERROR DETECTION CODES N 881 775 25 373 2

ERROR FUNCTIONS N 295 420 13 145 

ERROR SIGNALS N 300 824 3 164 

ERRORS N 3219 718 100 1689 5

ERS 17 N 1 0 0 0 

ERS 18 N 4 2 0 2 

ERS-1 ( ESA SATELLITE) N 271 196 0 18 

ERYTHROCYTES N 277 550 39 231 

ESA SATELLITES N 397 441 8 46 

ESA SPACECRAFT N 26 88 0 2 

ESCALATORS N 3 4 12 3 

ESCAPE N 4 38 0 0 

ESCAPE (ABANDONMENT) N 37 45 4 62 

ESCAPE CAPSULES N 22 53 0 77 

ESCAPE ROCKETS N 11 10 0 24 

ESCAPE SYSTEMS N 219 382 12 644 

ESCAPE VELOCITY N 45 259 0 40 

ESCARPMENTS N 24 22 0 10 

ESCHERICHIA N 107 96 3 65 

ESKIMOS N 2 0 1 1 

ESOPHAGUS N 11 30 2 6 

ESRO 1 SATELLITE N 131 73 0 4 

ESRO 2 SATELLITE N 45 44 0 10 

ESRO 4 SATELLITE N 32 68 1 1 

ESSA SATELLITES N 40 40 2 32 

ESSA 1 SATELLITE N 5 0 0 13 

ESSA 2 SATELLITE N 5 1 0 6 
NASA COMBINED FILE POSTING STATISTICS 

910117 

 "'**  SUBJECT TERM •-****** TYPE STAR IAA NLN OTHER T

ESSA 3 SATELLITE N 16 4 0 5 

ESSA 4 SATELLITE N 4 0 0 0 

ESSA 5 SATELLITE N 6 3 0 3 

ESSA 6 SATELLITE N 4 0 0 0 

ESSA 7 SATELLITE N 8 6 0 0 

ESSA 8 SATELLITE N 24 9 0 1 

ESSA 9 SATELLITE N 9 2 0 2 

ESSENTIALLY NON-OSCILLATORY SCHEMES N 3 6 0 0 

ESTERS N 332 202 32 260 

ESTIMATES N 2231 450 105 756 3

ESTIMATING N 1848 1609 181 511 4

ESTIMATORS N 94 253 2 31 

ESTONIA N 0 5 0 4 

ESTROGENS N 7 19 4 5 

ESTUARIES N 430 163 118 303 

ETA-MESONS N 54 1 0 5 

ETALONS N 8 65 0 7 

ETCHANTS N 45 30 2 43 

ETCHING N 842 1049 33 645 2

ETHANE N 226 236 5 129 

ETHERS N 264 134 34 244 

ETHICS N 10 11 41 5 

ETHIOPIA N 17 19 3 13 

ETHNIC FACTORS N 10 4 12 8 

ETHOXY ETHYLENE N 2 0 0 1 

ETHYL ALCOHOL N 402 420 9 216 

ETHYL COMPOUNDS N 128 96 0 111 

ETHYLENE N 348 332 14 233 

ETHYLENE COMPOUNDS N 169 119 3 128 

ETHYLENE DIHYDRAZINE N 0 0 0 

ETHYLENE OXIDE N 98 37 2 80 

ETHYLENEDIAMINE N 14 6 0 23 

ETHYLENEDIAMINETETRAACETIC ACIDS N 37 13 1 15 

ETIOLOGY N 58 157 40 57 

ETTINGSHAUSEN EFFECT N 4 10 1 2 

EUCLIDEAN GEOMETRY N 336 498 62 150 

EUDIOMETER$ N 1 1 0 2 

EUGLENA N 2 6 1 5 

EUKARYOTES N 11 43 0 11 

EULER BUCKLING N 50 129 1 14 

EULER EQUATIONS OF MOTION N 1073 2924 18 256 4

EULER-CAUCHY EQUATIONS N 52 32 3 11 

EULER-LAGRANGE EQUATION N 529 1443 38 161 2

EULER-LAMBERT EQUATION N 1 21 0 3 

EURECA (ESA) N 86 146 0 45 

EUROPA N 37 175 5 33 

EUROPA LAUNCH VEHICLES N 17 23 1 37 

EUROPA 1 LAUNCH VEHICLE N 40 22 0 91 

EUROPA 2 LAUNCH VEHICLE N 29 41 0 391 

EUROPA 3 LAUNCH VEHICLE N 45 30 0 593 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

EUROPA 4 LAUNCH VEHICLE N 3 0 0 1 

EUROPE N 995 1014 287 927 

EUROPEAN AIRBUS N 146 252 0 95 

EUROPEAN COMMUNICATIONS SATELLITE N 87 167 0 13 

EUROPEAN SPACE AGENCY N 443 1004 41 408 

EUROPEAN SPACE PROGRAMS N 1936 2630 46 354 

EUROPEAN 1 SPACECRAFT N 21 10 0 5 

EUROPIUM N 102 136 1 44 

EUROPIUM COMPOUNDS N 62 88 1 35 

EUROPIUM ISOTOPES N 22 7 0 5 

EUSTACHIAN TUBES N 3 17 0 2 

EUTECTIC ALLOYS N 335 1221 8 184 

EUTECTIC COMPOSITES N 33 96 1 26 

EUTECTICS N 355 323 14 287 

EUTROPHICATION N 165 43 21 242 

EUXENITE N 0 1 0 0 

EVACUATING N 5 4 0 6 

EVACUATING (TRANSPORTATION) N 87 103 1 78 

EVACUATING (VACUUM) N 48 54 1 51 

EVALUATION N 3095 422 225 4961 

EVANESCENCE N 18 64 0 11 

EVAPORATION N 1169 1394 39 627 

EVAPORATION RATE N 160 346 0 96 

EVAPORATIVE COOLING N 116 175 1 86 

EVAPORATORS N 211 224 3 148 

EVAPOROGRAPHY N 6 15 0 2 

EVAPOTRANSPIRATION N 211 146 14 72 

EVASIVE ACTIONS N 57 292 0 66 

EVASIVE SATELLITES N 0 5 0 0 

EVEN-EVEN NUCLEI N 105 2 0 27 

EVENING N 7 62 0 5 

EVENT HORIZON N 1 2 0 0 

EVENTS N 65 35 36 15 

EVERGLADES (FL) N 9 4 3 8 

EVOKED RESPONSE (PSYCHOPHYSIOLOGY) N 125 165 9 62 

EVOLUTION N 18 38 39 24 

EVOLUTION (DEVELOPMENT) N 623 988 238 388 

EVOLUTION (LIBERATION) N 12 8 1 13 

EXAMINATION N 44 22 129 34 

EXCAVATION N 89 30 16 86 

EXCHANGERS N 3 6 0 5 

EXCHANGING N 105 26 16 55 

EXCIMER LASERS N 309 852 9 206 

EXCIMERS N 61 23 3 37 

EXCITATION N 2956 882 166 1455 

EXCITONS N 261 511 45 88 

EXCLUSION N 14 5 4 1 1 

EXCRETION N 86 155 5 52 

EXERCISE PHYSIOLOGY N 217 621 24 56 

EXHALATION N 14 11 0 12 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *-"**"'** TYPE STAR IAA NLN OTHER 

EXHAUST CLOUDS N 4 3 0 3 

EXHAUST DIFFUSERS N 94 86 0 54 

EXHAUST EMISSION N 680 469 20 416 

EXHAUST FLOW SIMULATION N 149 234 3 103 

EXHAUST GASES N 2466 1652 137 2357 

EXHAUST NOZZLES N 537 571 4 739 

EXHAUST SYSTEMS N 343 181 19 460 

EXHAUST VELOCITY N 92 162 0 33 

EXHAUSTING N 11 6 1 10 

EXHAUSTION N 19 33 1 9 

EXISTENCE N 75 57 7 14 

EXISTENCE THEOREMS N 263 3051 18 49 

EXOBIOLOGY N 1306 1017 205 592 

EXOS SATELLITES N 0 15 0 0 

EXOS SOUNDING ROCKET N 0 5 0 1 

EXOS-A SATELLITE N 0 0 0 0 

EXOS-B SATELLITE N 0 22 0 0 

EXOS-C SATELLITE N 1 8 0 0 

EXOSAT SATELLITE N 156 569 3 22 

EXOSKELETONS N 12 14 2 19 

EXOSPHERE N 105 503 8 202 

EXOTHERMIC REACTIONS N 221 675 7 128 

EXPANDABLE STRUCTURES N 160 88 7 182 

EXPANSION N 526 488 38 388 

EXPECTANCY HYPOTHESIS N 28 110 0 3 

EXPECTATION N 37 59 6 6 

EXPEDITIONS N 67 20 7 31 

EXPELLANTS N 3 1 0 3 

EXPENDABLE STAGES (SPACECRAFT) N 32 108 0 47 

EXPERIENCE N 55 43 15 17 

EXPERIMENT DESIGN N 3527 2064 225 1918 

EXPERIMENTAL BOILING WATER REACTORS N 11 0 0 1 

EXPERIMENTAL BREEDER REACTOR 1 N 4 0 0 3 

EXPERIMENTAL BREEDER REACTOR 2 N 149 5 0 19 

EXPERIMENTAL GAS COOLED REACTORS N 7 1 0 1 

EXPERIMENTAL ORGANIC COOLED REACTORS N 0 0 0 2 

EXPERIMENTAL REFLECTOR ORBITAL SHOT PROJ N 4 4 0 3 

EXPERIMENTATION N 692 125 136 1250 

EXPERT SYSTEMS N 1512 1434 59 513 

EXPIRATION N 18 74 2 6 

EXPIRED AIR N 33 104 0 9 

EXPLODING WIRES N 184 349 7 130 

EXPLOITATION N 44 16 12 75 

EXPLORATION N 307 32 108 225 

EXPLORER SATELLITES N 255 307 3 214 

EXPLORER 1 SATELLITE N 9 18 2 9 

EXPLORER 10 SATELLITE N 1 0 0 0 

EXPLORER 11 SATELLITE N 1 2 1 5 

EXPLORER 12 SATELLITE N 29 72 0 17 

EXPLORER 14 SATELLITE N 3 5 0 3 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

EXPLORER 15 SATELLITE N 6 3 0 2 

EXPLORER 16 SATELLITE N 0 2 0 8 

EXPLORER 17 SATELLITE N 5 7 0 3 

EXPLORER 18 SATELLITE N 18 17 0 6 

EXPLORER 19 SATELLITE N 21 16 0 8 

EXPLORER 2 SATELLITE N 4 4 0 1 

EXPLORER 20 SATELLITE N 5 5 0 8 

EXPLORER 21 SATELLITE N 3 3 0 3 

EXPLORER 22 SATELLITE N 38 56 1 12 

EXPLORER 23 SATELLITE N 4 0 0 4 

EXPLORER 24 SATELLITE N 10 9 0 0 

EXPLORER 25 SATELLITE N 0 0 0 1 

EXPLORER 26 SATELLITE N 12 14 0 6 

EXPLORER 27 SATELLITE N 10 18 0 6 

EXPLORER 28 SATELLITE N 17 31 0 5 

EXPLORER 29 SATELLITE N 54 2 0 1 

EXPLORER 3 SATELLITE N 2 8 0 9 

EXPLORER 30 SATELLITE N 4 10 0 2 

EXPLORER 31 SATELLITE N 10 30 0 18 

EXPLORER 32 SATELLITE N 30 17 0 8 

EXPLORER 33 SATELLITE N 46 79 0 30 

EXPLORER 34 SATELLITE N 57 71 0 13 

EXPLORER 35 SATELLITE N 73 117 0 38 

EXPLORER 36 SATELLITE N 38 1 0 6 

EXPLORER 37 SATELLITE N 2 11 0 0 

EXPLORER 38 SATELLITE N 25 11 0 4 

EXPLORER 39 SATELLITE N 13 5 0 1 

EXPLORER 4 SATELLITE N 3 3 0 7 

EXPLORER 40 SATELLITE N 29 39 1 3 

EXPLORER 41 SATELLITE N 23 34 0 15 

EXPLORER 43 SATELLITE N 50 80 0 30 

EXPLORER 44 SATELLITE N 0 1 0 0 

EXPLORER 45 SATELLITE N 0 29 0 2 

EXPLORER 46 SATELLITE N 3 1 0 0 

EXPLORER 47 SATELLITE N 17 54 0 16 

EXPLORER 48 SATELLITE N 1 0 0 0 

EXPLORER 49 SATELLITE N 11 10 0 5 

EXPLORER 5 SATELLITE N 1 0 0 2 

EXPLORER 50 SATELLITE N 39 101 0 28 

EXPLORER 51 SATELLITE N 11 119 0 2 

EXPLORER 52 SATELLITE N 4 3 0 0 

EXPLORER 53 SATELLITE N 0 1 0 0 

EXPLORER 54 SATELLITE N 8 8 0 2 

EXPLORER 55 SATELLITE N 19 60 0 7 

EXPLORER 6 SATELLITE N 3 2 0 4 

EXPLORER 7 SATELLITE N 4 1 0 2 

EXPLORER 8 SATELLITE N 1 1 0 1 

EXPLORER 9 SATELLITE N 4 2 0 2 

EXPLOSION SUPPRESSION N 10 2 0 6 

EXPLOSIONS N 852 818 92 864 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM •*:,::**** TYPE STAR IAA NLN OTHER 

EXPLOSIVE DECOMPRESSION N 16 27 0 18 

EXPLOSIVE DEVICES N 200 184 12 358 

EXPLOSIVE FORMING N 122 181 7 137 

EXPLOSIVE WELDING N 68 191 15 66 

EXPLOSIVES N 1325 514 123 2028 

EXPONENTIAL FUNCTIONS N 742 956 36 255 

EXPONENTS N 60 71 22 25 

EXPOS (SPACELAB PAYLOAD) N 3 3 0 1 

EXPOSURE N 995 437 39 905 

EXPULSION N 36 26 0 119 

EXPULSION BLADDERS N 29 9 2 141 

EXTENSIONS N 90 45 10 47 

EXTENSOMETERS N 151 186 4 101 

EXTERNAL COMBUSTION ENGINES N 63 24 3 48 

EXTERNAL STORE SEPARATION N 68 77 1 218 

EXTERNAL STORES N 368 158 1 1465 

EXTERNAL SURFACE CURRENTS N 64 87 0 3 

EXTERNAL TANKS N 313 203 4 388 

EXTERNALLY BLOWN FLAPS N 186 109 0 61 

EXTINCTION N 448 617 19 196 

EXTINGUISHING N 107 135 5 99 

EXTRACTION N 400 101 57 311 

EXTRAGALACTIC RADIO SOURCES N 198 1788 9 73 

EXTRAPOLATION N 517 849 18 223 

EXTRASENSORY PERCEPTION N 7 7 6 6 

EXTRASOLAR PLANETS N 18 287 3 21 

EXTRATERRESTRIAL COMMUNICATION N 7 77 4 4 

EXTRATERRESTRIAL ENVIRONMENTS N 105 83 33 228 

EXTRATERRESTRIAL INTELLIGENCE N 45 263 21 28 

EXTRATERRESTRIAL LIFE N 221 785 154 209 

EXTRATERRESTRIAL MATTER N 86 189 10 98 

EXTRATERRESTRIAL RADIATION N 502 835 40 379 

EXTRATERRESTRIAL RADIO WAVES N 242 191 7 64 

EXTRATERRESTRIAL RESOURCES N 77 409 13 100 

EXTRAVEHICULAR ACTIVITY N 571 643 21 483 

EXTRAVEHICULAR MOBILITY UNITS N 34 69 0 35 

EXTREME ULTRAVIOLET EXPLORER SATELLITE N 10 46 0 8 

EXTREME ULTRAVIOLET RADIATION N 165 715 1 84 

EXTREMELY HIGH FREQUENCIES N 495 818 2 577 

EXTREMELY LOW FREQUENCIES N 278 254 1 125 

EXTREMELY LOW RADIO FREQUENCIES N 183 479 10 116 

EXTREMUM VALUES N 380 1617 39 198 

EXTROVERSION N 3 9 4 2 

EXTRUDING N 576 702 67 654 

EYE (ANATOMY) N 485 450 87 515 

EYE DISEASES N 49 119 25 27 

EYE DOMINANCE N 3 39 1 2 

EYE EXAMINATIONS N 36 133 8 17 

EYE MOVEMENTS N 395 849 38 175 

EYE PROTECTION N 138 102 5 274 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

EYEPIECES N 25 41 2 31 

EYRING THEORY N 11 16 0 2 

F REGION N 809 3104 19 318 

F STARS N 59 539 0 9 

F 1 REGION N 30 171 1 50 

F 2 REGION N 139 1487 2 139 

F-1 ROCKET ENGINE N 3 7 0 62 

F-100 AIRCRAFT N 36 39 0 90 

F-101 AIRCRAFT N 7 9 2 52 

F-102 AIRCRAFT N 14 9 1 41 

F-104 AIRCRAFT N 66 57 2 79 

F-105 AIRCRAFT N 10 7 3 79 

F-106 AIRCRAFT N 111 70 3 141 

F-111 AIRCRAFT N 141 189 5 688 

F-14 AIRCRAFT N 102 204 3 582 

F-15 AIRCRAFT N 200 401 3 546 

F-16 AIRCRAFT N 236 510 10 632 

F-17 AIRCRAFT N 10 36 0 17 

F-18 AIRCRAFT N 83 243 3 147 

F-2 AIRCRAFT N 9 3 0 8 

F-20 AIRCRAFT N 2 30 0 6 

F-27 AIRCRAFT N 23 16 0 7 

F-28 HELICOPTER N 0 1 0 0 

F-28 TRANSPORT AIRCRAFT N 32 27 1 5 

F-4 AIRCRAFT N 219 187 2 1167 

F-5 AIRCRAFT N 39 66 2 110 

F-8 AIRCRAFT N 92 78 1 141 

F-84 AIRCRAFT N 2 0 1 7 

F-86 AIRCRAFT N 4 6 3 16 

F-89 AIRCRAFT N 4 0 1 7 

F-9 AIRCRAFT N 1 0 0 13 

F-94 AIRCRAFT N 1 2 2 11 

FABRICATION N 4463 6221 307 5620 1

FABRICS N 431 374 44 568 

FABRY-PEROT INTERFEROMETERS N 322 1524 9 143 

FABRY-PEROT SPECTROMETERS N 79 299 5 57 

FACE (ANATOMY) N 31 24 8 39 

FACE CENTERED CUBIC LATTICES N 209 1417 3 55 

FACILITIES N 83 37 40 229 

FACSIMILE COMMUNICATION N 115 126 8 90 

FACTOR ANALYSIS N 507 252 41 215 

FACTORIAL DESIGN N 134 74 13 43 

FACTORIALS N 59 14 3 25 

FACTORIZATION N 320 402 5 39 

FACULAE N 90 535 0 44 

FADDEEV EQUATIONS N 43 12 1 9 

FADING N 102 36 1 53 

FAIL-SAFE SYSTEMS N 222 996 10 144 

FAILURE N 1209 115 66 1828 

FAILURE ANALYSIS N 3825 6020 161 3692 1
NASA COMBINED FILE POSTING STATISTICS 

910117 

** ..   SUBJECT TERM ** ***** TYPE STAR IAA NLN OTHER 

FAILURE MODES N 1373 3629 30 809 

FAINT OBJECT CAMERA N 27 91 0 6 

FAINT OBJECTS N 27 195 0 8 

FAIRCHILD-HILLER AIRCRAFT N 6 7 0 5 

FAIREY AIRCRAFT N 2 0 0 0 

FAIRINGS N 112 82 1 268 

FAITH 7 N 1 0 1 1 

FALCON MISSILE N 0 0 0 35 

FALKNER-SKAN EQUATION N 14 115 0 5 

FALLING N 24 27 1 24 

FALLING SPHERES N 70 60 1 30 

FALLOUT N 367 81 10 208 

FALSE ALARMS N 158 607 0 123 

FAN BLADES N 112 189 1 70 

FAN IN WING AIRCRAFT N 29 28 1 18 

FANS N 84 137 20 127 

FANS (LANDFORMS) N 11 0 1 5 

FAR FIELDS N 869 3362 2 326 

FAR INFRARED RADIATION N 683 2391 28 523 

FAR ULTRAVIOLET RADIATION N 460 2088 13 266 

FAR UV SPECTROSCOPIC EXPLORER N 2 3 0 4 

FARADAY DARK SPACE N 1 5 0 0 

FARADAY EFFECT N 578 1529 10 230 

FARM CROPS N 422 392 60 192 

FARMLANDS N 244 153 21 75 

FAST FOURIER TRANSFORMATIONS N 704 1789 9 253 

FAST NEUTRONS N 659 234 7 317 

FAST NUCLEAR REACTORS N 952 54 16 367 

FAST OXIDE REACTORS N 6 0 0 1 

FAST TEST REACTORS N 117 5 4 67 

FASTENERS N 272 316 31 449 

FASTING N 4 5 0 0 

FAT EMBOLISMS N 4 9 1 1 

FATIGUE (BIOLOGY) N 333 341 31 183 

FATIGUE (MATERIALS) N 3358 1554 427 2308 

FATIGUE LIFE N 2023 5567 60 1148 

FATIGUE TESTING MACHINES N 95 469 12 62 

FATIGUE TESTS N 2294 6604 159 1465 1

FATS N 44 77 17 37 

FATTY ACIDS N 129 218 28 97 

FAULT TOLERANCE N 903 1193 41 430 

FAULT TREES N 143 178 2 93 

FAULTS N 43 51 1 41 

FAYALITE N 2 37 0 1 

FD 2 AIRCRAFT N 7 0 0 7 

FDL-5 REENTRY VEHICLE N 0 0 0 9 

FEAR N 18 19 3 12 

FEAR OF FLYING N 11 26 0 2 

FEASIBILITY N 797 250 13 870 

FEASIBILITY ANALYSIS N 3141 2457 22 2551 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FEATHER RIVER BASIN (CA) N 3 1 0 2 

FEATHERING N 15 7 0 1 

FEATURE IDENTIFICATION AND LOCATION EXPER N 2 8 0 1 

FECES N 69 46 1 57 

FEDERAL BUDGETS N 741 89 470 788 

FEDERATIONS N 4 1 65 2 

FEED SYSTEMS N 243 179 6 374 

FEEDBACK N 837 751 90 446 

FEEDBACK AMPLIFIERS N 99 424 16 83 

FEEDBACK CIRCUITS N 177 946 16 160 

FEEDBACK CONTROL N 3224 9721 254 1479 1

FEEDBACK FREQUENCY MODULATION N 37 73 1 12 

FEEDERS N 45 19 1 52 

FEEDFORWARD CONTROL N 71 341 4 19 

FEEDING (SUPPLYING) N 56 51 8 69 

FEET (ANATOMY) N 17 19 1 25 

FELDSPARS N 82 423 7 39 

FELSITE N 1 11 0 2 

FELTS N 27 31 1 35 

FEMALES N 249 234 484 192 

FEMUR N 21 57 1 13 

FENCES N 3 8 0 1 

FENCES (BARRIERS) N 19 20 1 9 

FERMAT PRINCIPLE N 27 58 4 6 

FERMENTATION N 207 121 22 150 

FERMI LIQUIDS N 37 54 7 5 

FERMI SURFACES N 469 625 32 140 

FERMI-DIRAC STATISTICS N 18 68 0 10 

FERMIONS N 322 241 11 93 

FERMIUM N 3 0 0 1 

FERRANTI MERCURY COMPUTER N 4 1 0 1 

FERRATES N 25 5 0 9 

FERRIC IONS N 66 102 0 21 

FERRIMAGNETIC MATERIALS N 48 77 3 33 

FERRIMAGNETISM N 30 32 8 21 

FERRI MAGNETS N 29 17 0 17 

FERRITES N 656 1197 53 613 

FERRITIC STAINLESS STEELS N 137 282 10 53 

FERROCENES N 76 20 1 91 

FERROELECTRICITY N 403 527 61 249 

FERROFLUIDS N 26 85 4 21 

FERROGRAPHY N 13 15 1 3 

FERROMAGNETIC FILMS N 50 95 1 34 

FERROMAGNETIC MATERIALS N 487 469 25 313 

FERROMAGNETIC RESONANCE N 78 154 6 51 

FERROMAGNETISM N 404 373 69 219 

FERROUS METALS N 116 107 61 119 

FERRY SPACECRAFT N 14 48 2 26 

FERTILITY N 20 10 5 14 

FERTILIZATION N 47 28 9 21 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FERTILIZERS N 114 70 22 117 

FETUSES N 30 23 22 27 

FEVER N 17 16 6 66 

FEYNMAN DIAGRAMS N 209 108 14 89 

FIAT AIRCRAFT N 0 1 0 1 

FIBER COMPOSITES N 1425 4821 74 1164 

FIBER OPTICS N 2251 5359 276 1910 

FIBER ORIENTATION N 359 2203 8 188 

FIBER RELEASE N 30 14 1 8 

FIBER STRENGTH N 280 1668 12 200 

FIBERS N 895 304 184 1156 

FIBERS (MATHEMATICS) N 40 21 21 28 

FIBONACCI NUMBERS N 20 22 2 1 

FIBRILLATION N 15 64 3 8 

FIBRIN N 19 34 3 1 1 

FIBRINOGEN N 29 30 2 13 

FIBROBLASTS N 33 20 0 20 

FIBROSIS N 4 17 0 8 

FICKS EQUATION N 69 93 4 23 

FIDUCIARIES N 5 1 3 3 

FIELD ALIGNED CURRENTS N 223 1034 0 13 

FIELD ARMY BALLISTIC MISSILES N 2 1 0 1 

FIELD COILS N 79 223 3 35 

FIELD EFFECT TRANSISTORS N 1298 3982 113 1332 

FIELD EMISSION N 309 266 19 151 

FIELD INTENSITY METERS N 40 46 0 34 

FIELD MODE THEORY N 18 395 0 1 

FIELD OF VIEW N 284 477 0 118 

FIELD STRENGTH N 593 1723 10 203 

FIELD THEORY (ALGEBRA) N 306 98 69 137 

FIELD THEORY (PHYSICS) N 1633 3609 361 570 

FIELDS N 14 8 4 18 

FIGHTER AIRCRAFT N 1499 2894 186 3687 

FIGURE OF MERIT N 136 449 2 124 

FILAMENT WINDING N 344 924 8 654 

FILAMENTS N 163 632 4 177 

FILE MAINTENANCE (COMPUTERS) N 667 99 47 294 

FILES N 20 8 13 19 

FILES (TOOLS) N 0 1 0 2 

FILLERS N 241 731 11 365 

FILLETS N 49 95 2 30 

F I LUNG N 69 55 1 101 

FILM BOILING N 113 271 7 67 

FILM CONDENSATION N 55 132 2 27 

FILM COOLING N 336 642 8 214 

FILM THICKNESS N 640 2512 12 259 

FILMS N 156 96 25 192 

FILTER WHEEL INFRARED SPECTROMETERS N 57 9 0 5 

F I L TE RGRAMS N 19 162 0 2 

FILTERS N 253 259 26 250 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FILTRATION N 592 431 57 490 

FINANCE N 214 189 338 448 

FINANCIAL MANAGEMENT N 536 356 518 548 

FINE N 0 0 0 1 

FINE STRUCTURE N 461 2630 20 173 

FINENESS N 25 12 2 19 

FINENESS RATIO N 29 30 0 31 

FINES N 88 516 2 47 

FINGERS N 47 111 4 26 

FINISHES N 43 11 33 81 

FINITE DIFFERENCE THEORY N 4452 9831 138 1345 1

FINITE ELEMENT METHOD N 8090 15244 438 2697 2

FINITE VOLUME METHOD N 297 752 4 31 

FINLAND N 266 103 11 151 

FINNED BODIES N 115 256 1 111 

FINNISH SPACE PROGRAM N 7 3 0 0 

FINS N 333 406 4 474 

FIORDS N 6 7 1 5 

FIR FILTERS N 35 274 0 6 

FIRE CONTROL N 326 364 12 3144 

FIRE CONTROL CIRCUITS N 24 14 0 197 

FIRE DAMAGE N 132 71 5 112 

FIRE EXTINGUISHERS N 236 95 42 312 

FIRE FIGHTING N 255 138 82 354 

FIRE POINT N 20 18 8 20 

FIRE PREVENTION N 664 419 306 693 

FIREBALLS N 28 206 2 39 

FIREBEE 2 TARGET DRONE AIRCRAFT N 15 3 0 30 

FIREBREAKS N 13 2 0 5 

FIREFLIES N 4 1 0 2 

FIREPROOFING N 208 86 60 226 

FIRES N 651 139 131 635 

FIRING (IGNITING) N 92 78 8 195 

FIRMWARE N 16 13 1 6 

FIRST AID N 25 37 41 32 

FISCHER-TRDPSCH PROCESS N 25 2 0 8 

FISHBOWL OPERATION N 1 0 0 10 

FISHERIES N 118 84 30 120 

FISHES N 470 121 183 420 

FISSILE FUELS N 27 22 1 10 

FISSION N 326 100 18 189 

FISSION ELECTRIC CELLS N 8 5 0 8 

FISSION PRODUCTS N 1165 168 24 664 

FISSION WEAPONS N 2 1 20 7 

FISSIONABLE MATERIALS N 164 35 6 104 

FISSIUM N 6 0 0 0 

FISSURES (GEOLOGY) N 14 13 1 8 

FITNESS N 9 7 4 9 

FITTING N 126 37 5 41 

FITTINGS N 92 44 18 237 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FIXED POINT ARITHMETIC N 66 71 4 12 

FIXED POINTS (MATHEMATICS) N 232 338 30 93 

FIXED WINGS N 153 224 1 150 

FIXING N 8 16 5 14 

FIXTURES N 41 42 15 59 

FIZEAU EFFECT N 10 51 0 1 

FLAGELLATA N 7 9 4 26 

FLAKES N 15 31 0 12 

FLAKING N 16 12 0 7 

FLAME CALORIMETERS N 3 10 1 3 

FLAME DEFLECTORS N 6 8 0 19 

FLAME HOLDERS N 99 174 0 83 

FLAME IONIZATION N 77 186 3 68 

FLAME PLATING N 8 6 0 1 

FLAME PROBES N 46 166 2 30 

FLAME PROPAGATION N 920 2744 39 402 

FLAME RETARDANTS N 237 192 42 217 

FLAME SPECTROSCOPY N 140 492 20 57 

FLAME SPRAYING N 58 120 5 78 

FLAME STABILITY N 230 941 13 114 

FLAME TEMPERATURE N 220 1015 8 136 

FLAMEOUT N 33 74 0 46 

FLAMES N 679 276 78 443 

FLAMMABILITY N 672 539 116 648 

FLAMMABLE GASES N 97 126 9 93 

FLANGE WRINKLING N 13 9 0 1 

FLANGES N 146 171 3 172 

FLAPERONS N 5 14 0 4 

FLAPPING N 78 129 1 32 

FLAPPING HINGES N 47 46 1 12 

FLAPS (CONTROL SURFACES) N 331 276 6 418 

FLARE STARS N 31 455 6 5 

FLARED BODIES N 33 52 0 77 

FLARES N 55 263 0 269 

FLASH N 37 218 2 40 

FLASH BLINDNESS N 65 38 0 115 

FLASH LAMPS N 257 533 8 198 

FLASH POINT N 84 54 6 49 

FLASH WELDING N 1 13 5 7 

FLASHBACK N 20 24 0 13 

FLASHING (VAPORIZING) N 71 36 5 53 

FLASHOVER N 67 19 0 33 

FLASKS N 7 4 1 14 

FLAT CONDUCTORS N 84 35 4 66 

FLAT LAYERS N 33 228 1 18 

FLAT PATTERNS N 1 3 0 1 

FLAT PLATES N 2070 6338 35 781 

FLAT SURFACES N 222 698 9 116 

FLATNESS N 30 56 0 23 

FLATS (LANDFORMS) N 12 12 5 5 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**-***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FLATTENING N 33 68 0 21 

FLATWORMS N 3 3 0 4 

FLAVOR (PARTICLE PHYSICS) N 42 20 2 15 

FLEET BALLISTIC MISSILES N 2 5 0 66 

FLEET SATELLITE COMMUNICATION SYSTEM N 10 22 1 19 

FLEXIBILITY N 917 388 35 667 

FLEXIBLE BODIES N 737 1671 8 379 

FLEXIBLE SPACECRAFT N 325 974 3 106 

FLEXIBLE WINGS N 85 134 1 58 

FLEXING N 356 609 11 195 

FLEXORS N 6 15 0 4 

FLICKER N 58 161 1 15 

FLIGHT N 79 30 69 156 

FLIGHT AL TITUOE N 199 454 3 197 

FLIGHT CHARACTERISTICS N 1336 1473 179 1490 

FLIGHT CLOTHING N 137 109 3 264 

FLIGHT CONDITIONS N 324 833 22 234 

FLIGHT CONTROL N 2795 3160 234 3623 

FLIGHT CREWS N 1260 1402 54 1572 

FLIGHT ENVELOPES N 187 238 0 103 

FLIGHT FATIGUE N 88 142 1 50 

FLIGHT FITNESS N 162 489 7 57 

FLIGHT HAZARDS N 572 872 35 288 

FLIGHT INSTRUMENTS N 492 400 103 543 

FLIGHT LOAD RECORDERS N 61 35 1 46 

FLIGHT MANAGEMENT SYSTEMS N 97 230 1 24 

FLIGHT MECHANICS N 436 502 117 329 

FLIGHT NURSES N 0 5 0 0 

FLIGHT OPERATIONS N 176 182 10 179 

FLIGHT OPTIMIZATION N 156 463 14 160 

FLIGHT PATHS N 1418 1689 29 1035 

FLIGHT PLANS N 292 300 12 257 

FLIGHT RECORDERS N 226 184 8 97 

FLIGHT RULES N 42 42 13 33 

FLIGHT SAFETY N 1478 1894 118 916 

FLIGHT SIMULATION N 2253 2572 46 1846 

FLIGHT SIMULATORS N 1305 1211 52 976 

FLIGHT STABILITY TESTS N 149 174 6 171 

FLIGHT STRESS N 46 109 2 21 

FLIGHT STRESS (BIOLOGY) N 321 481 27 169 

FLIGHT SURGEONS N 44 58 2 17 

FLIGHT TEST INSTRUMENTS N 140 106 15 121 

FLIGHT TEST VEHICLES N 46 70 4 110 

FLIGHT TESTS N 4606 6349 205 9981 2

FLIGHT TIME N 181 429 3 128 

FLIGHT TRAINING N 558 467 65 595 

FLIGHT VEHICLES N 45 391 21 34 

FLINT N 3 3 0 1 

FLIP-FLOPS N 186 354 32 328 

FLIR DETECTORS N 157 265 2 476 
NASA COMBINED FILE POSTING STATISTICS 

910117 

***•-*-** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FLOAT ZONES N 47 117 0 102 

FLOATING N 111 93 4 76 

FLOATING POINT ARITHMETIC N 252 237 23 88 

FLOATS N 78 62 7 144 

FLOCCULATING N 68 43 11 43 

FLOOD CONTROL N 77 18 7 128 

FLOOD DAMAGE N 66 34 7 53 

FLOOD PLAINS N 133 49 9 88 

FLOOD PREDICTIONS N 180 76 9 105 

FLOODS N 367 146 48 224 

FLOORS N 115 50 17 121 

FLOQUET THEOREM N 77 321 1 15 

FLORIDA N 555 282 110 435 

FLOTATION N 91 51 54 135 

FLOUR N 0 0 0 2 

FLOUR (FOOD) N 6 1 2 6 

FLOW N 57 6 6 178 

FLOW CHAMBERS N 29 55 0 37 

FLOW CHARACTERISTICS N 2276 3379 236 1309 

FLOW CHARTS N 1596 1404 92 1493 

FLOW COEFFICIENTS N 175 250 6 96 

FLOW DEFLECTION N 103 1088 1 47 

FLOW DIRECTION INDICATORS N 46 50 2 25 

FLOW DISTORTION N 337 1749 8 119 

FLOW DISTRIBUTION N 8010 10640 86 4796 2

FLOW EQUATIONS N 2173 5301 44 680 

FLOW GEOMETRY N 777 3969 13 335 

FLOW GRAPHS N 21 55 4 11 

FLOW MEASUREMENT N 1862 4866 174 989 

FLOW NETS N 11 10 2 10 

FLOW REGULATORS N 120 149 3 128 

FLOW RESISTANCE N 232 919 6 136 

FLOW STAB! LITY N 1274 4873 49 501 

FLOW THEORY N 853 3335 118 353 

FLOW VELOCITY N 3981 13292 31 2093 1

FLOW VISUALIZATION N 2491 5228 37 1259 

FLOWMETERS N 447 565 56 399 

FLOX N 49 21 1 284 

FLUCTUATION THEORY N 105 1620 20 29 

FLUE GASES N 68 7 6 38 

FLUENCE N 137 125 2 23 

FLUERICS N 49 30 1 40 

FLUES N 121 66 10 71 

FLUID AMPLIFIERS N 205 387 32 202 

FLUID BOUNDARIES N 188 678 12 76 

FLUID DYNAMICS N 2688 1878 794 1786 

FLUID FILLED SHELLS N 41 132 1 11 

FLUID FILMS N 217 1158 20 90 

FLUID FILTERS N 263 215 10 334 

FLUID FLOW N 3189 1614 262 2295 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FLUID INJECTION N 158 707 3 101 

FLUID JETS N 220 337 3 102 

FLUID LOGIC N 20 107 7 8 

FLUID MANAGEMENT N 96 148 0 47 

FLUID MECHANICS N 1569 1613 613 1102 4

FLUID POWER N 75 92 86 82 

FLUID PRESSURE N 116 296 5 51 

FLUID ROTOR GYROSCOPES N 16 81 1 12 

FLUID SWITCHING ELEMENTS N 49 155 3 35 

FLUID TRANSMISSION LINES N 55 130 3 87 

FLUID-SOLID INTERACTIONS N 53 295 1 22 

FLUIDIC CIRCUITS N 77 290 8 49 

FLUIDICS N 366 606 96 562 

FLUIDIZED BED PROCESSORS N 802 433 39 606 

FLUIDS N 145 83 75 254 

FLUORESCENCE N 1737 2423 117 993 

FLUORIDES N 721 483 23 537 

FLUORINATION N 121 61 5 153 

FLUORINE N 434 503 25 559 

FLUORINE COMPOUNDS N 283 102 17 292 

FLUORINE ISOTOPES N 8 6 0 2 

FLUORINE ORGANIC COMPOUNDS N 65 108 10 51 

FLUORITE N 28 23 1 6 

FLUORO COMPOUNDS N 169 109 5 184 

FLUOROAMINES N 22 6 0 91 

FLUOROCARBONS N 251 382 31 218 

FLUOROHYDROCARBONS N 135 195 1 82 

FLUOROPHLOGOPITE N 1 1 0 0 

FLUOROPOLYMERS N 113 33 1 138 

FLUOROSCOPY N 37 61 11 31 

FLUOROSILICATES N 11 9 0 14 

FLUORSPAR N 4 0 6 2 

FLUSHING N 20 9 0 29 

FLUTTER N 753 376 41 641 

FLUTTER ANALYSIS N 604 1688 22 400 

FLUX N 20 7 1 35 

FLUX (RATE) N 1584 557 9 741 

FLUX DENSITY N 1536 2211 11 782 

FLUX PINNING N 45 66 0 5 

FLUX PUMPS N 14 15 1 7 

FLUX QUANTIZATION N 67 438 0 22 

FLUX TRANSFER EVENTS N 1 35 0 0 

FLUX VECTOR SPLITTING N 61 170 0 4 

FLUXES N 83 35 8 88 

FLY ASH N 49 12 2 44 

FLY BY TUBE CONTROL N 2 3 0 0 

FLY BY WIRE CONTROL N 325 581 10 255 

FLYBY MISSIONS N 348 766 8 249 

FLYING EJECTION SEATS N 9 23 2 14 

FLYING PERSONNEL N 220 324 11 140 
NASA COMBINED FILE POSTING STATISTICS 

910117 

-"~<****** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FLYING PLATFORMS N 79 183 9 139 

FLYING SPOT SCANNERS N 34 50 1 20 

FLYWHEELS N 520 527 13 231 

FM/PM (MODULATION) N 10 23 1 8 

FOAMING N 40 19 1 22 

FOAMS N 563 326 76 593 

FOCAL PLANE DEVICES N 378 1081 0 210 

FOCI N 94 210 4 42 

FOCUSING N 1070 2106 16 739 

FOG N 791 731 25 460 

FOG DISPERSAL N 58 86 2 48 

FOIL BEARINGS N 45 36 0 24 

FOILS N 35 33 0 29 

FOILS (MATERIALS) N 341 161 5 225 

FOKKER AIRCRAFT N 27 65 4 11 

FOKKER-PLANCK EQUATION N 375 1181 7 74 

FOLDING N 67 31 2 53 

FOLDING FIN AIRCRAFT ROCKET VEHICLE N 3 0 1 48 

FOLDING STRUCTURES N 225 110 0 139 

FOLDS (GEOLOGY) N 60 36 6 33 

FOLIAGE N 82 51 3 72 

FOLIC ACID N 3 5 3 1 

FOOD N 247 111 322 262 

FOOD CHAIN N 40 9 6 26 

FOOD INTAKE N 92 211 18 67 

FOOD PROCESSING N 78 18 41 99 

FOOD PRODUCTION (IN SPACE) N 32 78 0 8 

FOOTPRINTS N 26 40 0 8 

FORBIDDEN BANDS N 66 841 1 20 

FORBIDDEN TRANSITIONS N 114 837 5 47 

FORBUSH DECREASES N 71 502 1 16 

FORCE N 33 67 17 35 

FORCE DISTRIBUTION N 498 1035 17 310 

FORCE VECTOR RECORDERS N 1 11 0 1 

FORCE-FREE MAGNETIC FIELDS N 39 307 0 9 

FORCED CONVECTION N 303 921 14 117 

FORCED VIBRATION N 306 2003 19 96 

FOREARM N 12 54 0 7 

FOREBODIES N 128 215 0 142 

FORECASTING N 1452 334 340 957 

FOREHEAD N 3 2 0 0 

FOREIGN BODIES N 31 22 1 16 

FOREIGN POLICY N 59 19 102 97 

FOREST FIRE DETECTION N 35 72 3 21 

FOREST FIRES N 69 117 9 37 

FOREST MANAGEMENT N 332 294 52 178 

FORESTS N 1401 953 158 461 

FORGING N 499 739 55 612 

FORKS N 4 5 0 12 

FORM FACTORS N 322 90 5 78 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FORMALDEHYDE N 244 739 11 160 

FORMAL! SM N 415 179 21 63 

FORMAT N 733 104 47 420 

FORMATES N 33 31 0 25 

FORMATION N 29 23 7 58 

FORMATIONS N 120 34 33 94 

FORMHYDROXAMIC ACID N 1 0 0 0 

FORMIC ACID N 48 115 0 28 

FORMICA N 0 0 0 1 

FORMING TECHNIQUES N 513 629 116 564 

FORMS (PAPER) N 21 3 18 31 

FORMULAS N 34 6 27 12 

FORMULAS (MATHEMATICS) N 681 294 95 272 

FORMULATIONS N 313 19 27 455 

FORMYL IONS N 2 88 0 1 

FORSTERITE N 3 60 0 5 

FORTISAN (TRADEMARK) N 0 0 0 3 

FORTRAN N 5959 1528 357 4376 1

FORWARD SCATTERING N 249 484 0 101 

FOSSIL FUELS N 857 517 89 626 

FOSSILS N 144 226 114 125 

FOSTER THEORY N 2 4 1 1 

FOULING N 142 50 11 158 

FOUNDATIONS N 245 145 120 251 

FOUNDRIES N 58 23 16 53 

FOUR BODY PROBLEM N 45 100 1 9 

FOURIER ANALYSIS N 1224 2050 115 574 

FOURIER LAW N 22 87 3 11 

FOURIER SERIES N 582 2377 147 198 

FOURIER TRANSFORMATION N 2843 7481 213 1127 1

FOURIER-BESSEL TRANSFORMATIONS N 32 63 7 17 

FOVEA N 32 200 1 23 

FR-1 SATELLITE N 13 25 0 4 

FRACTALS N 124 368 3 17 

FRACTIONATION N 225 349 26 194 

FRACTIONS N 45 68 8 26 

FRACTOGRAPHY N 513 2306 37 223 

FRACTURE MECHANICS N 4772 10060 454 2343 1

FRACTURE STRENGTH N 2272 8030 211 1156 1

FRACTURES (MATERIALS) N 614 411 102 424 

FRACTURING N 616 221 92 369 

FRAGMENTATION N 412 573 14 401 

FRAGMENTS N 150 149 1 190 

FRAME PHOTOGRAPHY N 56 159 1 23 

FRAMES N 252 365 79 171 

FRAMES (DATA PROCESSING) N 56 74 0 17 

FRAMING CAMERAS N 55 147 0 26 

FRANCE N 682 1006 150 880 

FRANCIUM N 5 3 0 1 

FRANCK-CONDON PRINCIPLE N 58 308 6 22 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FRAUNHOFER LINE DISCRIMINATORS N 8 19 3 10 

FRAUNHOFER LINES N 70 497 5 49 

FREDHOLM EQUATIONS N 264 1304 18 76 

FREE ATMOSPHERE N 56 232 5 13 

FREE BOUNDARIES N 143 864 11 37 

FREE CONVECTION N 401 2541 25 203 

FREE ELECTRON LASERS N 638 1291 10 220 

FREE ELECTRONS N 243 760 38 111 

FREE ENERGY N 385 805 34 182 

FREE FALL N 121 306 0 134 

FREE FLIGHT N 242 302 15 292 

FREE FLIGHT TEST APPARATUS N 51 82 0 53 

FREE FLOW N 809 2109 10 464 

FREE JETS N 405 1169 10 115 

FREE MOLECULAR FLOW N 130 583 3 68 

FREE RADICALS N 520 929 87 319 

FREE VIBRATION N 327 3424 24 105 

FREE WING AIRCRAFT N 8 0 0 6 

FREE-PISTON ENGINES N 23 32 0 16 

FREEZE DRYING N 33 13 8 32 

FREEZING N 518 228 29 413 

FREIGHT COSTS N 41 41 12 34 

FREIGHTERS N 10 17 9 6 

FRENCH GUIANA N 9 23 0 55 

FRENCH SATELLITES N 70 113 0 39 

FRENCH SPACE PROGRAM N 148 427 6 220 

FRENKEL DEFECTS N 48 58 0 17 

FREON N 343 347 4 202 

FREQUENCIES N 1512 458 30 1478 

FREQUENCY ANALYZERS N 246 220 20 181 

FREQUENCY ASSIGNMENT N 364 756 32 242 

FREQUENCY COMPRESSION DEMODULATORS N 4 14 0 4 

FREQUENCY CONTROL N 309 1226 41 293 

FREQUENCY CONVERTERS N 321 819 22 336 

FREQUENCY DISCRIMINATORS N 24 106 1 21 

FREQUENCY DISTRIBUTION N 590 2596 25 282 

FREQUENCY DIVIDERS N 61 220 4 51 

FREQUENCY DIVISION MULTIPLE ACCESS N 49 219 0 19 

FREQUENCY DIVISION MULTIPLEXING N 133 558 3 126 

FREQUENCY HOPPING N 113 320 0 131 

FREQUENCY MEASUREMENT N 429 939 21 249 

FREQUENCY MODULATION N 1180 3268 70 1203 

FREQUENCY MODULATION PHOTOMULTIPLIERS N 7 5 0 3 

FREQUENCY MULTIPLIERS N 135 679 7 130 

FREQUENCY RANGES N 509 1260 11 298 

FREQUENCY RESPONSE N 521 9628 35 376 1

FREQUENCY REUSE N 20 158 0 10 

FREQUENCY SCANNING N 82 208 1 63 

FREQUENCY SHIFT N 565 2032 1 240 

FREQUENCY SHIFT KEYING N 160 731 2 155 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FREQUENCY STABILITY N 553 2235 25 398 

FREQUENCY STANDARDS N 464 525 33 217 

FREQUENCY SYNCHRONIZATION N 144 423 2 72 

FREQUENCY SYNTHESIZERS N 150 268 18 179 

FRESH WATER N 90 68 11 123 

FRESNEL DIFFRACTION N 91 454 8 45 

FRESNEL INTEGRALS N 83 215 2 51 

FRESNEL LENSES N 134 153 2 41 

FRESNEL REFLECTORS N 49 168 0 27 

FRESNEL REGION N 61 419 5 35 

FRETTING N 102 141 5 39 

FRETTING CORROSION N 53 153 9 21 

FRICTION N 1368 683 146 776 

FRICTION DRAG N 157 363 5 117 

FRICTION FACTOR N 379 1504 12 153 

FRICTION MEASUREMENT N 228 423 7 121 

FRICTION REDUCTION N 265 352 21 178 

FRICTION WELDING N 38 39 2 16 

FRICTIONLESS ENVIRONMENTS N 24 85 0 13 

FRIEDEL-CRAFT REACTION N 6 0 1 9 

FRIENDSHIP 7 N 0 2 0 1 

FRINGE MULTIPLICATION N 4 21 0 1 

FRIT N 17 8 0 8 

FROGS N 93 188 13 51 

FRONTAL WAVES N 16 39 2 13 

FRONTS N 7 30 0 24 

FRONTS (METEOROLOGY) N 393 572 11 169 

FROST N 204 126 4 139 

FROST DAMAGE N 34 12 1 33 

FROSTBITE N 14 8 1 12 

FROUDE NUMBER N 127 225 1 45 

FROZEN EQUILIBRIUM FLOW N 31 98 0 17 

FROZEN FOODS N 35 11 6 13 

FRUITS N 34 16 9 34 

FRUSTRATION N 8 8 6 7 

FRUSTUMS N 25 78 0 52 

FUEL CAPSULES N 194 105 0 164 

FUEL CELL POWER PLANTS N 53 17 0 31 

FUEL CELLS N 1111 778 117 1055 

FUEL COMBUSTION N 1147 2523 57 725 

FUEL CONSUMPTION N 2477 2708 101 1966 

FUEL CONTAMINATION N 94 110 1 142 

FUEL CONTROL N 187 398 5 345 

FUEL CORROSION N 51 133 3 64 

FUEL FLOW N 211 377 5 278 

FUEL FLOW REGULATORS N 37 52 0 55 

FUEL GAGES N 37 38 2 56 

FUEL INJECTION N 603 923 16 772 

FUEL OILS N 398 264 29 298 

FUEL PRODUCTION N 464 229 30 367 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

FUEL PUMPS N 122 159 6 302 

FUEL SPRAYS N 191 758 0 101 

FUEL SYSTEMS N 497 368 29 1024 

FUEL TANK PRESSURIZATION N 103 141 3 254 

FUEL TANKS N 559 545 9 1089 

FUEL TESTS N 277 371 13 296 

FUEL VALVES N 81 59 1 262 

FUEL-AIR RATIO N 470 1223 4 271 

FUELS N 695 81 251 1008 

FUJITA METHOD N 1 0 0 0 

FULL SCALE TESTS N 146 720 2 80 

FULMINATES N 4 3 0 6 

FUMES N 62 19 13 54 

FUMIGATION N 10 12 2 3 

FUNCTION GENERATORS N 84 221 3 59 

FUNCTION SPACE N 464 737 126 131 

FUNCTIONAL ANALYSIS N 1031 1877 420 481 

FUNCTIONAL DESIGN SPECIFICATIONS N 513 344 3 131 

FUNCTIONAL INTEGRATION N 81 194 22 26 

FUNCTIONALS N 165 1424 12 28 

FUNCTIONS N 22 23 40 57 

FUNCTIONS (MATHEMATICS) N 2095 2176 730 1039 

FUNGAL DISEASES N 3 0 0 1 

FUNGI N 145 71 68 179 

FUNGICIDES N 23 2 13 36 

FUNNELS N 9 23 0 4 

FURAN RESINS N 26 9 3 24 

FURANS N 34 7 3 19 

FURFURYL ALCOHOL N 15 15 0 16 

FURLABLE ANTENNAS N 47 16 0 20 

FURNACES N 700 352 69 635 

FUSELAGES N 724 1307 27 974 

FUSES N 10 8 2 22 

FUSES (ORDNANCE) N 96 22 3 771 

FUSIBILITY N 5 14 1 10 

FUSION N 75 17 7 57 

FUSION (MELTING) N 208 247 10 134 

FUSION REACTORS N 871 1072 33 239 

FUSION WEAPONS N 10 2 2 7 

FUSION WELDING N 93 187 10 87 

FUSION-FISSION HYBRID REACTORS N 47 81 2 15 

FUZZY SETS N 98 174 16 13 

FUZZY SYSTEMS N 35 99 8 10 

FV-12A AIRCRAFT N 4 6 0 4 

G STARS N 54 524 0 10 

G-1 AIRCRAFT N 0 0 0 1 

G-222 AIRCRAFT N 0 4 0 1 

G-91 AIRCRAFT N 11 3 0 0 

G-95/4 AIRCRAFT N 0 1 0 0 

GA-5 AIRCRAFT N 1 0 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

GABBRO N 55 178 0 7 

GABON N 3 7 0 2 

GADOLINIUM N 280 223 0 124 

GADOLINIUM ALLOYS N 10 42 0 3 

GADOLINIUM ISOTOPES N 7 9 0 5 

GADOLINIUM-GALLIUM GARNET N 0 24 0 0 

GAIA HYPOTHESIS N 2 10 0 0 

GALACTIC BULGE N 21 352 0 4 

GALACTIC CLUSTERS N 250 4460 15 114 

GALACTIC COSMIC RAYS N 142 532 4 47 

GALACTIC EVOLUTION N 466 5086 84 166 

GALACTIC MASS N 19 327 0 2 

GALACTIC NUCLEI N 307 4194 13 54 

GALACTIC RADIATION N 784 4542 34 257 

GALACTIC RADIO WAVES N 64 452 3 38 

GALACTIC ROTATION N 62 1721 6 6 

GALACTIC STRUCTURE N 417 6108 34 95 

GALACTOSE N 4 9 0 7 

GALAXIES N 743 2046 283 483 

GALERKIN METHOD N 611 2959 15 108 

GALILEAN SATELLITES N 51 324 3 65 

GALI LED PROBE N 23 75 3 35 

GALILED PROJECT N 97 116 5 73 

GALILED SPACECRAFT N 56 218 0 29 

GALL N 2 5 3 3 

GALLAMINE TRIETHIODIDE N 0 0 0 1 

GALLATES N 3 11 0 2 

GALLIUM N 298 252 8 218 

GALLIUM ALLOYS N 97 118 0 55 

GALLIUM ANTIMDNIDES N 75 238 1 37 

GALLIUM ARSENIDE LASERS N 187 2210 12 205 

GALLIUM ARSENIDES N 3137 8299 88 2673 1

GALLIUM COMPOUNDS N 163 165 5 124 

GALLIUM ISOTOPES N 12 26 0 4 

GALLIUM NITRIDES N 12 18 0 4 

GALLIUM OXIDES N 11 35 0 2 

GALLIUM PHDSPHIDES N 247 576 2 128 

GALLIUM SELENIDES N 18 85 0 11 

GALVANIC SKIN RESPONSE N 31 73 1 15 

GALVANOMAGNETIC EFFECTS N 49 121 13 38 

GALVANOMETERS N 56 69 7 39 

GAMBIA N 2 2 0 1 

GAME THEORY N 585 827 186 383 

GAMETOCYTES N 13 8 1 3 

GAMMA FUNCTION N 133 188 23 52 

GAMMA GLOBULIN N 5 10 4 4 

GAMMA RAY ABSORPTIOMETRY N 15 11 0 8 

GAMMA RAY ABSORPTION N 24 50 2 17 

GAMMA RAY ASTRONOMY N 252 1458 13 100 

GAMMA RAY BEAMS N 48 43 1 28 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM "'****** TYPE STAR IAA NLN OTHER 

GAMMA RAY BURSTS N 228 622 6 51 

GAMMA RAY LASERS N 36 47 1 7 

GAMMA RAY OBSERVATORY N 73 80 0 36 

GAMMA RAY SPECTRA N 237 524 7 104 

GAMMA RAY SPECTROMETERS N 214 195 7 254 

GAMMA RAY TELESCOPES N 134 241 0 36 

GAMMA RAYS N 4300 3342 141 2478 1

GANGLIA N 37 150 5 31 

GANTRY CRANES N 9 9 4 26 

GANYMEDE N 53 176 2 31 

GAPS N 183 340 5 129 

GAPS (GEOLOGY) N 11 5 0 10 

GARBAGE N 21 97 12 23 

GARMENTS N 32 21 2 35 

GARNETS N 165 390 15 146 

GARP ATLANTIC TROPICAL EXPERIMENT N 216 324 10 17 

GAS ANALYSIS N 1189 968 74 838 

GAS ATOMIZATION N 24 101 1 21 

GAS BAGS N 28 23 3 8 

GAS BEARINGS N 409 636 23 333 

GAS CHROMATOGRAPHY N 1308 970 218 982 

GAS COMPOSITION N 360 992 7 254 

GAS COOLED FAST REACTORS N 15 5 0 8 

GAS COOLED REACTORS N 228 53 17 155 

GAS COOLING N 163 383 5 122 

GAS DENSITY N 466 3069 5 192 

GAS DETECTORS N 429 203 14 408 

GAS DISCHARGE TUBES N 235 910 14 128 

GAS DISCHARGES N 642 2510 46 425 

GAS DISSOCIATION N 208 1655 4 105 

GAS DYNAMICS N 1731 4952 324 1418 

GAS EVOLUTION N 136 374 5 107 

GAS EXCHANGE N 209 439 8 107 

GAS EXPANSION N 262 1255 10 116 

GAS EXPLOSIONS N 136 364 6 84 

GAS FLOW N 2943 6601 121 2136 1

GAS GENERATORS N 406 524 8 1319 

GAS GIANT PLANETS N 30 402 4 55 

GAS GUNS N 84 63 3 78 

GAS HEATING N 106 710 5 56 

GAS INJECTION N 296 1054 2 234 

GAS IONIZATION N 695 3507 59 250 

GAS JETS N 253 783 6 115 

GAS LASERS N 1216 3964 95 1344 

GAS LUBRICANTS N 72 174 9 30 

GAS MASERS N 54 121 0 45 

GAS METERS N 46 12 7 21 

GAS MIXTURES N 1353 6489 41 661 

GAS PATH ANALYSIS N 13 16 0 5 

GAS PIPES N 43 36 9 32 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

GAS POCKETS N 18 24 1 10 

GAS PRESSURE N 622 3482 13 447 

GAS REACTORS N 23 45 1 14 

GAS RECOVERY N 102 41 3 70 

GAS SPECTROSCOPY N 100 845 15 94 

GAS STREAMS N 231 364 4 122 

GAS TEMPERATURE N 316 2417 4 176 

GAS TRANSPORT N 237 726 21 109 

GAS TUBES N 5 35 1 7 

GAS TUNGSTEN ARC WELDING N 206 306 12 178 

GAS TURBINE ENGINES N 2133 4956 134 1398 

GAS TURBINES N 2199 2240 176 2093 

GAS VALVES N 57 83 1 171 

GAS VISCOSITY N 82 344 6 32 

GAS WELDING N 73 85 26 106 

GAS-GAS INTERACTIONS N 106 352 4 83 

GAS-ION INTERACTIONS N 92 360 5 23 

GAS-LIQUID INTERACTIONS N 252 392 19 126 

GAS-METAL INTERACTIONS N 546 2175 45 216 

GAS-SOLID INTERACTIONS N 148 267 7 56 

GAS-SOLID INTERFACES N 342 941 30 135 

GASDYNAMIC LASERS N 84 1220 18 224 

GASEOUS DIFFUSION N 603 1389 16 304 

GASEOUS FISSION REACTORS N 72 61 3 41 

GASEOUS FUELS N 101 308 6 102 

GASEOUS ROCKET PROPELLANTS N 93 101 1 132 

GASEOUS SELF-DIFFUSION N 19 27 1 11 

GASES N 1371 168 527 1390 

GASIFICATION N 224 138 10 148 

GASKETS N 79 57 11 145 

GASOHOL (FUEL) N 125 31 12 104 

GASOLINE N 491 188 32 412 

GASTROINTESTINAL SYSTEM N 128 106 35 88 

GATES N 1 5 0 2 

GATES (CIRCUITS) N 902 1595 38 1256 

GATES (OPENINGS) N 23 17 0 21 

GAUGE INVARIANCE N 266 154 7 124 

GAUGE THEORY N 281 313 33 143 

GAUSS EQUATION N 378 369 41 168 

GAUSS-MARKOV THEOREM N 70 64 1 18 

GAUSSIAN ELIMINATION N 122 115 0 7 

GAUZE N 6 16 0 4 

GAW-1 AIRFOIL N 9 7 0 2 

GAW-2 AIRFOIL N 3 2 0 2 

GE COMPUTERS N 6 2 0 11 

GE 625 COMPUTER N 1 0 0 1 

GE 635 COMPUTER N 5 0 0 5 

GEAR N 4 7 0 5 

GEAR TEETH N 233 236 5 100 

GEARS N 732 547 84 569 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM **•*"-*~ TYPE STAR IAA NLN OTHER 

GEGENSCHEIN N 15 46 0 7 

GEHLENITE N 1 1 0 0 

GEIGER COUNTERS N 81 119 6 61 

GELATINS N 43 87 4 46 

GELATION N 87 25 2 66 

GELLED PROPELLANTS N 20 9 1 78 

GELLED ROCKET PROPELLANTS N 14 6 0 108 

GELS N 279 126 27 305 

GEMINI (GT-1) SPACECRAFT N 0 0 0 2 

GEMINI B SPACECRAFT N 0 1 0 219 

GEMINI FLIGHTS N 84 65 2 104 

GEMINI PROJECT N 81 77 23 257 

GEMINI SPACECRAFT N 53 53 5 162 

GEMINI 10 FLIGHT N 21 2 1 5 

GEMINI 11 FLIGHT N 21 8 1 6 

GEMINI 12 FLIGHT N 23 8 1 8 

GEMINI 2 SPACECRAFT N 0 1 0 2 

GEMINI 3 FLIGHT N 5 0 1 10 

GEMINI 4 FLIGHT N 24 7 1 19 

GEMINI 5 FLIGHT N 26 4 0 17 

GEMINI 6 FLIGHT N 8 3 1 15 

GEMINI 7 FLIGHT N 30 2 2 21 

GEMINI 8 FLIGHT N 9 2 1 9 

GEMINI 9 FLIGHT N 16 2 1 4 

GEMINID METEOROIDS N 13 119 0 9 

GENE EXPRESSION N 9 11 1 9 

GENERAL AVIATION AIRCRAFT N 865 1079 94 536 

GENERAL DYNAMICS AIRCRAFT N 11 16 2 22 

GENERALIZATION (PSYCHOLOGY) N 6 4 0 0 

GENERATION N 13 5 6 18 

GENERATORS N 78 32 12 154 

GENES N 36 42 5 20 

GENETIC CODE N 52 203 33 40 

GENETIC ENGINEERING N 94 19 26 233 

GENETICS N 382 325 431 418 

GENIE ROCKET VEHICLE N 0 0 0 16 

GENITOURINARY SYSTEM N 4 11 8 6 

GEOBOTANY N 52 92 13 45 

GEOCENTRIC COORDINATES N 100 442 6 90 

GEOCHEMISTRY N 1078 1558 364 942 

GEOCHRONOLOGY N 636 676 72 295 

GEOCORONAL EMISSIONS N 33 110 0 13 

GEOCYCLOTRONS N 0 2 0 0 

GEODESIC LINES N 63 139 0 47 

GEODESY N 1343 1064 187 1327 

GEODETIC ACCURACY N 61 144 0 77 

GEODETIC COORDINATES N 474 496 11 322 

GEODETIC SATELLITES N 362 378 36 302 

GEODETIC SURVEYS N 662 631 46 866 

GEODIMETERS N 32 14 1 40 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER T

GEODYNAMICS N 355 512 53 239 

GEOELECTRICITY N 62 269 3 72 

GEOGRAPHIC APPLICATIONS PROGRAM N 31 29 6 14 

GEOGRAPHIC INFORMATION SYSTEMS N 202 329 3 50 

GEOGRAPHY N 522 207 354 446 

GEOIDS N 395 551 4 243 

GEOLE SATELLITES N 6 6 0 1 

GEOLOGICAL FAULTS N 1173 595 59 469 2

GEOLOGICAL SURVEYS N 1280 1139 766 1045 4

GEOLOGY N 2162 593 1394 1869 6

GEOMAGNETIC HOLLOW N 15 14 1 6 

GEOMAGNETIC LATITUDE N 117 918 0 68 

GEOMAGNETIC MICROPULSATIONS N 107 881 3 50 

GEOMAGNETIC PULSATIONS N 209 1323 9 94 

GEOMAGNETIC TAIL N 237 1765 5 49 2

GEOMAGNETISM N 2874 8727 187 1413 1

GEOMETRIC ACCURACY N 96 98 0 5 

GEOMETRIC DILUTION OF PRECISION N 10 47 0 3 

GEOMETRIC RECTIFICATION (IMAGERY) N 232 387 2 31 

GEOMETRICAL ACOUSTICS N 26 75 0 15 

GEOMETRICAL OPTICS N 221 1109 18 100 

GEOMETRICAL THEORY OF DIFFRACTION N 95 328 3 37 

GEOMETRY N 1607 850 393 951 3

GEOMORPHOLOGY N 1204 1049 193 570 

GEOPHYSICAL FLUID FLOW CELLS N 12 1 0 11 

GEOPHYSICAL FLUIDS N 37 166 1 20 

GEOPHYSICAL OBSERVATORIES N 403 112 9 344 

GEOPHYSICAL SATELLITES N 71 102 6 92 

GEOPHYSICS N 2492 1819 776 2219 7

GE OPOTENTI A L N 528 1378 6 284 2

GEOPOTENTIAL HEIGHT N 198 593 0 67 

GEOPOTENTIAL RESEARCH MISSION N 33 27 0 17 

GEOPRESSURE N 35 2 0 40 

GEORGIA N 193 51 27 160 

GEOS SATELLITES (ESA) N 167 251 2 34 

GEOS 1 SATELLITE N 90 135 1 12 

GEOS 2 SATELLITE N 124 182 0 14 

GEOS 3 SATELLITE N 178 179 0 50 

GEOS-0 SATELLITE N 1 2 0 1 

GEOSARI PROJECT N 0 1 0 0 

GEOSAT SATELLITES N 41 138 0 29 

GEOSTROPHIC WIND N 354 1186 4 106 

GEOSYNCHRONOUS ORBITS N 452 1050 3 193 

GEOSYNCLINES N 13 23 4 10 

GEOTECHNICAL ENGINEERING N 84 10 22 45 

GEOTECHNICAL FABRICS N 14 0 0 0 

GEOTEMPERATURE N 65 139 2 25 

GEOTHERMAL ANOMALIES N 12 8 0 2 

GEOTHERMAL ENERGY CONVERSION N 428 332 57 338 

GEOTHERMAL ENERGY EXTRACTION N 99 32 6 114 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

GEOTHERMAL ENERGY UTILIZATION N 208 39 7 200 

GEOTHERMAL RESOURCES N 986 532 145 770 

GEOTHERMAL TECHNOLOGY N 181 52 12 141 

GEOTROPISM N 39 72 4 30 

GERDIEN CONDENSERS N 11 22 0 3 

GERIATRICS N 5 1 56 14 

GERMAN INFRARED LABORATORY N 3 15 0 0 

GERMAN SPACE PROGRAM N 0 11 0 1 

GERMANATES N 22 41 1 11 

GERMANI DES N 8 53 1 4 

GERMANIUM N 1103 1482 50 779 

GERMANIUM ALLOYS N 171 283 1 76 

GERMANIUM ANTIMONIDES N 5 4 0 0 

GERMANIUM CHLORIDES N 2 2 0 1 

GERMANIUM COMPOUNDS N 225 218 8 107 

GERMANIUM DIODES N 71 138 4 75 

GERMANIUM ISOTOPES N 14 20 2 8 

GERMANIUM OXIDES N 38 91 0 11 

GERMANY N 8 19 22 0 

GERMINATION N 78 53 9 29 

GERONTOLOGY N 20 54 47 14 

GERT N 73 17 8 22 

GESTALT THEORY N 7 16 2 1 

GET AWAY SPECIALS (STS) N 110 96 0 27 

GETOL AIRCRAFT N 0 15 1 0 

GETTERS N 88 71 2 52 

GEYSERS N 35 26 4 26 

GHANA N 6 7 1 3 

GHOSTS N 15 31 0 9 

GIACOBINI-ZINNER COMET N 98 216 0 18 

GIANT STARS N 187 1839 13 97 

GIBBERELLINS N 1 1 1 2 

GIBBS ADSORPTION EQUATION N 11 5 0 5 

GIBBS EQUATIONS N 6 77 2 4 

GIBBS FREE ENERGY N 131 216 12 35 

GIBBS PHENOMENON N 21 32 4 1 

GIBBS-HELMHOLTZ EQUATIONS N 16 5 2 2 

GIMBALLESS INERTIAL NAVIGATION N 9 21 0 23 

GIMBALS N 392 739 0 382 

GIOTTO MISSION N 190 370 4 46 

GIRDER WEBS N 8 15 0 10 

GIRDERS N 58 47 43 71 

GIRDLES N 0 0 0 1 

GLACIAL DRIFT N 99 67 4 46 

GLACIERS N 243 217 60 136 

GLACIOLOGY N 223 163 39 66 

GLANDS N 0 1 1 0 

GLANDS (ANATOMY) N 19 17 9 24 

GLANDS (SEALS) N 13 9 0 19 

GLARE N 55 36 4 60 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

GLASS N 2679 3243 245 2136 

GLASS COATINGS N 150 100 6 81 

GLASS ELECTRODES N 33 17 4 17 

GLASS FIBER REINFORCED PLASTICS N 372 2651 17 258 

GLASS FIBERS N 1079 2033 49 1205 

GLASS LASERS N 107 437 1 70 

GLASS TRANSITION TEMPERATURE N 341 357 0 35 

GLASSWARE N 33 28 12 28 

GLASSY CARBON N 23 26 1 18 

GLAUBER THEORY N 41 59 0 18 

GLAUCOMA N 11 32 4 2 

GLAZES N 74 54 8 53 

GLIDE LANDINGS N 23 41 0 16 

GLIDE PATHS N 293 239 1 180 

GLIDERS N 218 390 68 126 

GLIDING N 51 91 33 60 

GLIMM METHOD N 2 2 0 1 

GLINT N 52 66 0 66 

GLOBAL AIR POLLUTION N 80 219 10 39 

GLOBAL AIR SAMPLING PROGRAM N 47 39 2 19 

GLOBAL ATMOSPHERIC RESEARCH PROGRAM N 488 410 55 122 

GLOBAL POSITIONING SYSTEM N 705 1386 15 434 

GLOBAL TRACKING NETWORK N 65 50 1 78 

GLOBAL WARMING N 35 39 0 3 

GLOBES N 5 6 2 2 

GLOBULAR CLUSTERS N 115 2489 7 28 

GLOBULES N 12 64 3 14 

GLOBULINS N 27 42 5 25 

GLOMERULUS N 2 24 1 3 

GLOTTIS N 6 7 0 1 

GLOVES N 76 32 0 114 

GLOW DISCHARGES N 395 1033 14 242 

GLUCOSE N 179 262 7 147 

GLUCOSIDES N 17 18 2 8 

GLUES N 41 41 9 34 

GLUONS N 126 64 2 86 

GLUTAMATES N 16 26 4 10 

GLUTAMIC ACID N 20 39 2 10 

GLUTAMINE N 18 17 2 4 

GLUTATHIONE N 1 1 19 1 12 

GLYCERIDES N 16 31 3 12 

GLYCEROLS N 113 119 8 98 

GLYCIDYL AZIDE POLYMER N 0 0 0 2 

GLYCINE N 63 127 1 28 

GLYCOGENS N 43 166 6 24 

GLYCOLS N 207 104 3 245 

GLYCOLYSIS N 37 95 2 18 

GNEISS N 87 44 6 19 

GNOMONIC PROJECTION N 6 1 1 1 

GNOTOBIOTICS N 11 8 8 16 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

GOAL THEORY N 14 31 4 5 

GOALS N 192 81 64 153 

GOATS N 18 26 0 8 

GOBI DESERT N 3 9 0 1 

GODDARD TRAJECTORY DETERMINATION SYSTEM N 9 0 0 3 

GOERTLER INSTABILITY N 31 60 0 5 

GOES SATELLITES N 373 477 2 85 

GOES 1 N 5 10 1 4 

GOES 2 N 8 27 0 4 

GOES 3 N 9 15 0 3 

GOES 4 N 6 4 0 0 

GOES 5 N 9 9 0 1 

GOES 6 N 4 2 0 0 

GOES 7 N 0 0 0 1 

GOES-G N 0 0 0 0 

GOGGLES N 126 66 4 260 

GOLAY DETECTOR CELLS N 3 7 1 4 

GOLD N 1105 810 50 567 

GOLD ALLOYS N 220 145 4 103 

GOLD COATINGS N 112 190 2 75 

GOLD ISOTOPES N 38 4 0 10 

GOLD 198 N 8 3 0 5 

GOMPERTZ CURVES N 3 1 0 1 

GONADS N 14 28 2 13 

GONDOLAS N 43 75 2 29 

GONIOMETERS N 68 124 3 61 

GOODNESS OF FIT N 158 51 1 30 

GORES N 15 15 0 16 

GOVERNMENT PROCUREMENT N 596 227 173 434 

GOVERNMENT/INDUSTRY RELATIONS N 853 1247 212 876 

GOVERNMENTS N 956 159 1566 978 

GRADE N 1 2 0 2 

GRADIENT INDEX OPTICS N 24 519 2 3 

GRADIENTS N 563 670 15 354 

GRADIOMETERS N 5 18 0 0 

GRAEFF CALCULUS N 1 1 0 0 

GRAFTING N 55 16 6 32 

GRAIN BOUNDARIES N 2191 5739 38 739 

GRAIN SIZE N 411 1392 0 148 

GRAINS N 77 239 2 33 

GRAINS (FOOD) N 162 54 7 75 

GRAMMARS N 376 72 169 158 

GRAND CANYON (AZ) N 9 6 3 3 

GRAND TOURS N 60 130 3 84 

GRAND UNIFIED THEORY N 34 83 3 7 

GRANITE N 217 167 27 112 

GRANTS N 185 7 156 450 

GRANULAR MATERIALS N 427 627 27 252 

GRAPH THEORY N 481 406 81 108 

GRAPHIC ARTS N 297 60 215 377 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

GRAPHITE N 2242 2474 84 2697 

GRAPHITE-EPOXY COMPOSITES N 1000 2900 12 646 

GRAPHITE-POLYIMIDE COMPOSITES N 85 133 0 68 

GRAPHITIZATION N 112 82 2 186 

GRAPHOEPITAXY N 9 15 0 7 

GRAPHOLOGY N 20 6 2 10 

GRAPHS (CHARTS) N 6300 7624 262 5981 2

GRASHOF NUMBER N 56 326 0 22 

GRASSES N 99 69 12 56 

GRASSHOPPERS N 5 2 1 0 

GRASSLANDS N 184 183 20 45 

GRATINGS N 16 121 1 9 

GRATINGS (SPECTRA) N 617 2371 35 412 

GRAUPEL N 39 88 0 0 

GRAVELS N 66 27 7 31 

GRAVIMETERS N 225 121 11 233 

GRAVIMETRY N 604 677 40 623 

GRAVIRECEPTORS N 88 99 0 35 

GRAVITATION N 807 251 198 1027 

GRAVITATION THEORY N 254 2331 59 120 

GRAVITATIONAL COLLAPSE N 125 2433 15 33 

GRAVITATIONAL CONSTANT N 74 497 4 43 

GRAVITATIONAL EFFECTS N 1991 6391 76 1032 

GRAVITATIONAL FIELDS N 1465 4754 88 884 

GRAVITATIONAL LENSES N 29 546 1 4 

GRAVITATIONAL PHYSIOLOGY N 127 634 2 31 

GRAVITATIONAL WAVE ANTENNAS N 53 304 0 0 

GRAVITATIONAL WAVES N 383 1556 23 115 

GRAVITINOS N 4 38 0 2 

GRAVITONS N 29 125 0 16 

GRAVITROPISM N 32 35 0 21 

GRAVITY ANOMALIES N 562 706 14 448 

GRAVITY GRADIENT SATELLITES N 125 408 5 72 

GRAVITY GRADIOMETERS N 127 104 0 97 

GRAVITY PROBE B N 15 29 0 10 

GRAVITY WAVES N 866 3005 24 290 

GRAY GAS N 29 269 3 4 

GRAY SCALE N 63 197 0 28 

GRAZING N 40 47 0 46 

GRAZING FLOW N 29 20 0 1 

GRAZING INCIDENCE N 105 402 1 41 

GRAZING INCIDENCE TELESCOPES N 40 131 0 15 

GREASES N 138 105 12 141 

GREAT BASIN (US) N 40 6 10 11 

GREAT CIRCLES N 29 34 0 4 

GREAT LAKES (NORTH AMERICA) N 230 76 21 163 

GREAT PLAINS CORRIDOR (NORTH AMERICA) N 182 125 12 43 

GREAT SALT LAKE (UT) N 20 15 0 8 

GREAT SMOKY MOUNTAINS (NC-TN) N 7 4 1 2 

GREB SATELLITES N 1 0 0 1 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

GREECE N 53 55 17 38 

GREEK SPACE PROGRAM N 0 0 0 0 

GREEN WAVE EFFECT N 37 6 0 1 

GREEN'S FUNCTIONS N 1349 3832 95 500 

GREENHOUSE EFFECT N 298 416 15 103 

GREENHOUSES N 49 11 3 43 

GREENLAND N 349 165 16 144 

GREGORIAN ANTENNAS N 6 26 0 0 

GRENADA N 2 9 6 0 

GRENADES N 17 13 3 29 

GRID GENERATION (MATHEMATICS) N 585 1266 0 74 

GRIDS N 234 866 6 144 

GRIFFITH CRACK N 37 571 4 23 

GRIGG-SKJELLERUP COMET N 4 16 0 2 

GRIGNARD REACTIONS N 16 0 1 16 

GRINDING N 12 26 4 5 

GRINDING (COMMINUTION) N 115 71 7 89 

GRINDING (MATERIAL REMOVAL) N 180 166 26 161 

GRINDING MACHINES N 85 38 8 87 

GRINDING MILLS N 17 10 1 13 

GRIST (TELESCOPE) N 8 18 0 1 

GRIT N 10 11 0 10 

GROOVES N 198 501 1 74 

GROOVING N 105 55 3 64 

GROSS NATIONAL PRODUCT N 22 10 6 26 

GROUND BASED CONTROL N 429 665 10 279 

GROUND CREWS N 71 71 2 131 

GROUND EFFECT (AERODYNAMICS) N 500 617 19 256 

GROUND EFFECT (COMMUNICATIONS) N 47 283 1 36 

GROUND EFFECT MACHINES N 381 482 66 548 

GROUND HANDLING N 76 263 4 72 

GROUND OPERATIONAL SUPPORT SYSTEM N 76 81 1 130 

GROUND RESONANCE N 44 80 0 8 

GROUND SPEED N 66 55 1 53 

GROUND SQUIRRELS N 2 22 0 8 

GROUND STATE N 792 2084 18 264 

GROUND STATIONS N 1812 5502 32 1539 

GROUND SUPPORT EQUIPMENT N 1326 705 37 4216 

GROUND SUPPORT SYSTEMS N 523 595 22 686 

GROUND TESTS N 545 1382 12 722 

GROUND TRACKS N 62 115 2 41 

GROUND TRUTH N 1140 1120 7 269 

GROUND WATER N 1280 330 130 1133 

GROUND WAVE PROPAGATION N 208 222 12 72 

GROUND WIND N 462 265 5 165 

GROUND-AIR-GROUND COMMUNICATION N 267 350 10 95 

GROUP DYNAMICS N 314 144 183 193 

GROUP THEORY N 1230 774 430 546 

GROUP VELOCITY N 45 903 2 26 

GROUP 1B COMPOUNDS N 0 3 0 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

GROUP 2B COMPOUNDS N 3 18 1 2 

GROUP 3A COMPOUNDS N 13 38 2 6 

GROUP 3B COMPOUNDS N 3 7 1 2 

GROUP 4A COMPOUNDS N 17 23 2 7 

GROUP 4B COMPOUNDS N 15 22 1 5 

GROUP 5A COMPOUNDS N 26 43 3 11 

GROUP 58 COMPOUNDS N 9 21 1 3 

GROUP 6A COMPOUNDS N 15 23 0 2 

GROUP 6B COMPOUNDS N 10 11 0 0 

GROUP 7B COMPOUNDS N 2 0 0 0 

GROUP 8 COMPOUNDS N 7 9 1 4 

GROUPS N 10 8 24 5 

GROUT N 55 3 4 34 

GROWTH N 741 427 195 1009 

GRUMMAN AIRCRAFT N 11 51 3 17 

GRUNEISEN CONSTANT N 52 70 2 24 

GUADELOUPE N 0 3 0 1 

GUAM N 15 1 0 10 

GUANETHIDINE N 1 1 0 1 

GUANIDINES N 18 8 0 24 

GUANINES N 8 25 0 1 

GUANOSINES N 2 10 0 0 

GUARDS (SHIELDS) N 28 10 2 25 

GUATEMALA N 30 6 7 10 

GUAYULE N 6 4 0 6 

GUIDANCE (MOTION) N 475 410 124 1211 

GUIDANCE SENSORS N 248 508 15 315 

GUIDE VANES N 192 305 0 181 

GUIDED MISSILE SUBMARINES N 4 4 1 33 

GUINEA N 3 12 1 76 

GUINEA PIGS N 99 170 2 122 

GULF OF ALASKA N 27 27 2 34 

GULF OF CALIFORNIA (MEXICO) N 26 18 2 15 

GULF OF MEXICO N 312 151 26 157 

GULF STREAM N 170 266 8 137 

GULFS N 47 31 5 44 

GULLIVER PROGRAM N 0 0 0 1 

GUM NEBULA N 1 32 0 2 

GUMS (SUBSTANCES) N 18 7 17 19 

GUN LAUNCHERS N 114 77 1 142 

GUN PROPELLANTS N 253 85 4 494 

GUN TURRETS N 18 13 0 74 

GUNFIRE N 73 42 1 138 

GUNN DIODES N 110 780 3 77 

GUNN EFFECT N 140 701 18 186 

GUNNERY TRAINING N 28 10 1 69 

GUNS N 6 9 2 27 

GUNS (ORDNANCE) N 286 85 13 846 

GUST ALLEVIATORS N 141 132 0 59 

GUST LOADS N 568 535 4 310 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******--'~< SUBJECT TERM ***,;.;*** TYPE STAR IAA NLN OTHER 

GUSTS N 345 337 1 203 

GUTENBERG ZONE N 0 3 0 2 

GUY WIRES N 33 15 1 18 

GUYANA N 4 8 1 5 

GYNECOLOGY N 3 9 17 4 

GYPSUM N 42 26 3 39 

GYRATION N 28 101 1 17 

GYRATORS N 43 89 6 31 

GYRES N 15 11 0 3 

GYRO HORIZONS N 17 60 1 9 

GYROCOMPASSES N 110 347 9 158 

GYRODAMPERS N 3 10 0 1 

GYRODYNE AIRCRAFT N 1 0 0 0 

GYRDFREQUENCY N 95 683 0 30 

GYROMAGNETISM N 40 183 5 15 

GYROSCOPE FLUIDS N 13 40 0 12 

GYROSCOPES N 836 1260 83 1265 

GYROSCOPIC COUPLING N 23 72 0 10 

GYROSCOPIC PENDULUMS N 52 157 1 22 

GYROSCOPIC STABILITY N 289 1690 15 215 

GYROSTABILIZERS N 145 346 9 148 

GYROTROPISM N 13 196 2 11 

H ALPHA LINE N 191 3825 0 71 

H BETA LINE N 41 998 1 2 

H GAMMA LINE N 15 146 0 2 

H I REGIONS N 12 383 0 2 

H II REGIONS N 225 3062 0 19 

H LINES N 79 1938 0 37 

H WAVES N 12 144 1 5 

H-1 ENGINE N 3 5 0 24 

H-126 AIRCRAFT N 3 0 0 3 

H-17 HELICOPTER N 1 3 0 1 

H-19 HELICOPTER N 1 0 0 1 

H-25 HELICOPTER N 0 1 0 0 

H-43 HELICOPTER N 1 0 0 1 

H-53 HELICOPTER N 39 38 0 117 

H-54 HELICOPTER N 7 0 0 10 

H-56 HELICOPTER N 4 10 0 11 

H-60 HELICOPTER N 7 27 0 18 

HABITABILITY N 111 122 19 135 

HABITATS N 264 96 39 126 

HABITS N 17 18 20 16 

HABITUATION (LEARNING) N 20 48 4 6 

HADRONS N 800 746 42 293 

HAFNIUM N 150 127 10 77 

HAFNIUM ALLOYS N 66 263 3 47 

HAFNIUM CARBIDES N 28 75 0 27 

HAFNIUM COMPOUNDS N 37 61 2 71 

HAFNIUM IODIDES N 1 1 0 2 

HAFNIUM ISOTOPES N 13 17 0 6 
NASA COMBINED FILE POSTING STATISTICS 

910117 

 '+'**  SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

HAFNIUM OXIDES N 45 79 0 33 

HAIL N 264 383 16 150 

HAILSTORMS N 46 146 3 23 

HAIR N 24 32 6 19 

HAITI N 7 6 2 3 

HAL/S (LANGUAGE) N 9 13 0 13 

HALDEN BOILING WATER REACTOR N 9 0 1 2 

HALF CONES N 19 24 0 26 

HALF LIFE N 402 159 0 144 

HALF PLANES N 57 835 1 16 

HALF SPACES N 237 1664 6 47 

HALIDES N 346 208 42 225 

HALITES N 45 21 3 37 

HALL ACCELERATORS N 12 40 0 4 

HALL EFFECT N 891 2200 20 431 

HALL GENERATORS N 28 65 2 13 

HALLAM NUCLEAR POWER FACILITY N 1 0 0 3 

HALLEY'S COMET N 728 1356 41 152 

HALLUCINATIONS N 3 9 4 3 

HALO ORBIT SPACE STATION N 5 10 0 5 

HALOCARBONS N 51 109 6 34 

HALOGEN COMPOUNDS N 200 114 20 135 

HALOGEN OCCULTATION EXPERIMENT N 16 12 0 23 

HALOGENATION N 115 30 13 87 

HALOGENS N 184 149 34 168 

HALOPHILES N 7 74 5 14 

HALOS N 117 1043 9 34 

HALPHEN METHOD N 1 3 0 0 

HAMBURGER AIRCRAFT N 1 2 0 0 

HAMILTON-JACOBI EQUATION N 109 261 22 34 

HAMILTONIAN FUNCTIONS N 1464 3161 82 440 

HAMMERHEAD CONFIGURATION N 1 2 0 1 

HAMMERS N 36 17 2 29 

HAMSTERS N 41 100 1 54 

HAND (ANATOMY) N 89 138 7 72 

HANDBOOKS N 1082 191 4727 1700 

HANDEDNESS N 9 19 1 6 

HANDICAPS N 57 10 36 37 

HANDLES N 10 5 0 23 

HANDLEY PAGE AIRCRAFT N 4 3 2 1 

HANDLING EQUIPMENT N 109 70 7 198 

HANDWRITING N 27 17 3 13 

HANFORD REACTORS N 14 0 1 9 

HANG GLIDERS N 16 16 5 10 

HANGARS N 42 34 2 70 

HANKEL FUNCTIONS N 99 601 9 15 

HANSEN LUNAR THEORY N 13 22 2 0 

HAPLOSCOPES N 2 7 0 1 

HARBORS N 113 15 26 151 

HARD LANDING N 4 1 0 6 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

HARDENERS N 12 28 2 16 

HARDENING N 44 41 1 39 

HARDENING (MATERIALS) N 685 956 39 610 

HARDENING (SYSTEMS) N 57 22 1 458 

HARDNESS N 667 1007 13 474 

HARDNESS TESTS N 176 507 12 142 

HARDWARE N 852 2042 68 673 

HARDWARE UTILIZATION LISTS N 19 2 6 19 

HARLETON METEORITE N 0 2 0 0 

HARMONIC ANALYSIS N 746 2368 132 362 

HARMONIC CONTROL N 28 58 0 14 

HARMONIC EXCITATION N 187 551 4 32 

HARMONIC FUNCTIONS N 234 621 43 94 

HARMONIC GENERATIONS N 242 1581 8 86 

HARMONIC GENERATORS N 147 216 7 143 

HARMONIC MOTION N 77 170 8 29 

HARMONIC OSCILLATION N 354 1637 12 109 

HARMONIC OSCILLATORS N 213 872 19 96 

HARMONIC RADIATION N 72 543 1 24 

HARMONICS N 807 740 42 365 

HARNESSES N 131 77 1 199 

HARPOON MISSILE N 6 17 0 70 

HARRIER AIRCRAFT N 66 216 13 453 

HARTMANN FLOW N 19 115 0 3 

HARTMANN NUMBER N 16 252 0 5 

HARTREE APPROXIMATION N 387 498 25 166 

HARTREE-FOCK-SLATER METHOD N 3 81 0 5 

HARVARD RADIO METEOR PROJECT N 1 0 0 3 

HASTELLOY (TRADEMARK) N 172 110 0 146 

HATCHES N 26 10 0 74 

HAULING N 31 8 1 33 

HAWAII N 385 235 57 349 

HAWK MISSILE N 11 9 0 486 

HAWKER SIDDELEY AIRCRAFT N 8 33 1 4 

HAWKEYE SATELLITES N 12 17 0 5 

HAY N 8 0 0 2 

HAZARDOUS MATERIAL DISPOSAL (IN SPACE) N 9 16 0 5 

HAZARDS N 1224 246 272 1648 

HAZE N 174 382 2 115 

HAZE DETECTION N 15 42 0 7 

HC-3 HELICOPTER N 1 0 0 0 

HCL ARGON LASERS N 4 4 0 0 

HCL LASERS N 7 23 0 1 

HCN LASERS N 13 142 4 9 

HEAD (ANATOMY) N 224 188 10 143 

HEAD (FLUID MECHANICS) N 18 25 2 18 

HEAD DOWN TILT N 168 148 0 11 

HEAD FLOW N 13 35 1 10 

HEAD MOVEMENT N 121 283 1 45 

HEAD-UP DISPLAYS N 223 363 1 227 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM **'***** TYPE STAR IAA NLN OTHER 

HEADACHE N 15 24 2 7 

HEADERS N 3 4 0 3 

HEALING N 29 22 8 22 

HEALTH N 397 112 382 480 

HEALTH PHYSICS N 543 350 141 260 

HEALTH PHYSICS RESEARCH REACTOR N 6 0 1 1 

HEAD N 77 140 4 143 

HEAD 1 N 87 310 0 39 

HEAD 2 N 107 622 1 50 

HEAD 3 N 46 129 0 15 

HEARING N 271 167 107 214 

HEART N 183 152 104 195 

HEART DISEASES N 222 1181 185 91 

HEART FUNCTION N 221 1378 44 105 

HEART IMPLANTATION N 6 8 1 11 

HEART MINUTE VOLUME N 34 149 2 9 

HEART RATE N 702 1989 19 270 

HEART VALVES N 13 117 6 4 

HEARTHS N 4 8 0 7 

HEAT N 253 15 138 361 

HEAT ACCLIMATIZATION N 67 208 5 25 

HEAT AFFECTED ZONE N 181 215 0 17 

HEAT BALANCE N 410 782 19 139 

HEAT BUDGET N 113 87 10 74 

HEAT CAPACITY MAPPING MISSION N 274 103 2 18 

HEAT EXCHANGERS N 2055 1808 146 1815 

HEAT FLUX N 1899 5097 17 1023 

HEAT GENERATION N 230 450 9 151 

HEAT ISLANDS N 48 51 1 8 

HEAT MEASUREMENT N 824 1208 46 500 

HEAT OF COMBUSTION N 179 172 4 148 

HEAT OF DISSOCIATION N 37 28 1 11 

HEAT OF FORMATION N 261 192 10 186 

HEAT OF FUSION N 75 55 2 25 

HEAT OF SOLUTION N 65 38 3 24 

HEAT OF VAPORIZATION N 177 127 4 116 

HEAT PIPES N 974 1463 45 625 

HEAT PUMPS N 927 573 45 467 

HEAT RADIATORS N 243 316 5 285 

HEAT RESISTANT ALLOYS N 1744 4604 173 1384 

HEAT SHIELDING N 644 721 15 1760 

HEAT SINKS N 424 567 6 482 

HEAT SOURCES N 656 1322 17 467 

HEAT STORAGE N 1097 1215 48 571 

HEAT STROKE N 24 25 0 6 

HEAT TAPES N 0 1 0 0 

HEAT TOLERANCE N 173 279 8 96 

HEAT TRANSFER N 8252 9508 686 6283 2

HEAT TRANSFER COEFFICIENTS N 1019 3695 7 526 

HEAT TRANSMISSION N 817 841 282 540 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

HEAT TREATMENT N 2933 5933 151 2236 1

HEATERS N 98 131 3 100 

HEATING N 1348 648 153 1018 

HEATING EQUIPMENT N 720 662 87 844 

HEAVING N 83 58 0 50 

HEAVY ELEMENTS N 162 643 14 80 

HEAVY IONS N 930 922 45 338 

HEAVY LIFT AIRSHIPS N 13 47 0 3 

HEAVY LIFT HELICOPTERS N 42 86 0 35 

HEAVY LIFT LAUNCH VEHICLES N 61 116 1 40 

HEAVY NUCLEI N 323 778 9 108 

HEAVY WATER N 161 165 5 81 

HEAVY WATER COMPONENTS TEST REACTORS N 4 0 0 5 

HEAVY WATER REACTORS N 90 3 2 31 

HEIGHT N 471 701 4 305 

HEINKEL AIRCRAFT N 2 4 2 1 

HEISENBERG THEORY N 131 158 8 44 

HELICAL ANTENNAS N 48 160 1 47 

HELICAL FLOW N 161 300 0 40 

HELICAL INDUCERS N 52 83 0 13 

HELICAL WINDINGS N 105 172 2 59 

HELICES N 1 24 0 2 

HELICOPTER CONTROL N 309 926 27 175 

HELICOPTER DESIGN N 588 2006 55 335 

HELICOPTER ENGINES N 223 531 9 333 

HELICOPTER PERFORMANCE N 569 1263 40 462 

HELICOPTER PROPELLER DRIVE N 102 160 2 67 

HELICOPTER TAIL ROTORS N 89 187 1 84 

HELICOPTER WAKES N 173 223 1 92 

HELICOPTERS N 2649 1241 263 4019 

HELlO AIRCRAFT N 2 2 0 1 

HELIOMETERS N 42 68 2 15 

HELlOS A N 22 31 0 41 

HELlOS B N 17 21 0 42 

HELlOS PROJECT N 95 95 1 18 

HELlOS SATELLITES N 77 140 0 19 

HE LIDS 1 N 77 115 0 7 

HELlOS 2 N 61 75 0 5 

HELIOSE I SMOLOGY N 107 143 1 12 

HELIOSPHERE N 138 382 5 47 

HELIDSTATS N 255 267 2 187 

HELIOTRONS N 38 35 0 3 

HELIPORTS N 60 47 4 33 

HELITRONS N 0 4 0 1 

HELIUM N 2972 5995 79 1710 1

HELIUM AFTERGLOW N 22 74 3 10 

HELIUM ATOMS N 119 403 2 44 

HELIUM COMPOUNDS N 10 23 1 8 

HELIUM FILM N 30 8 3 9 

HELIUM HYDROGEN ATMOSPHERES N 7 89 0 3 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

HELIUM IONS N 249 1049 8 96 

HELIUM ISOTOPES N 772 648 14 191 

HELIUM PLASMA N 179 795 2 35 

HELIUM-NEON LASERS N 283 2351 9 158 

HELIUM-OXYGEN ATMOSPHERES N 32 55 1 10 

HELLMANN-FEYNMAN THEOREM N 6 9 1 5 

HELMET MOUNTED DISPLAYS N 109 152 0 77 

HELMETS N 260 211 4 360 

HELMHOLTZ EQUATIONS N 81 659 2 35 

HELMHOLTZ RESONATORS N 24 43 0 7 

HELMHOLTZ VORTICITY EQUATION N 105 89 3 19 

HEMATITE N 25 39 4 17 

HEMATOCRIT N 31 118 0 23 

HEMATOCRIT RA TI 0 N 18 39 5 4 

HEMATOLOGY N 139 448 54 124 

HEMATOPOIESIS N 42 103 4 46 

HEMATOPOIETIC SYSTEM N 55 42 5 68 

HEMATURIA N 0 6 0 0 

HEMISPHERE CYLINDER BODIES N 28 52 0 16 

HEMISPHERES N 24 179 1 13 

HEMISPHERICAL SHELLS N 87 101 0 64 

HEMOCYTES N 0 5 1 1 

HEMODYNAMIC RESPONSES N 262 1055 7 91 

HEMODYNAMICS N 226 521 38 82 

HEMOGLOBIN N 128 307 28 82 

HEMOLYSIS N 29 49 3 21 

HEMOPERFUSIDN N 0 4 0 2 

HEMORRHAGES N 35 113 4 65 

HEMOSTATICS N 28 31 10 8 

HENRY LAW N 28 38 0 15 

HEOS A SATELLITE N 86 62 1 11 

HEOS B SATELLITE N 31 40 0 0 

HEOS SATELLITES N 30 111 0 2 

HEPAR INS N 10 28 2 12 

HEPATITIS N 3 4 2 28 

HEPTAD I ENE N 1 1 0 0 

HEPTANES N 51 88 2 29 

HERBICIDES N 28 5 1 19 

HERBIG-HARD OBJECTS N 28 390 1 11 

HERCULES ENGINE N 0 2 0 7 

HERCULES NOVA N 41 46 0 13 

HEREDITY N 30 76 44 11 

HERING-BREVER REFLEX N 0 3 0 0 

HERMES MANNED SPACEPLANE N 151 256 0 56 

HERMETIC SEALS N 269 219 6 1026 

HERMITIAN POLYNOMIAL N 202 586 13 102 

HERO REACTOR N 2 0 0 1 

HERTZSPRUNG-RUSSELL DIAGRAM N 63 1417 5 21 

HERZBERG BANDS N 15 66 0 1 

HESSIAN MATRICES N 34 27 0 4 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

HET EXPERIMENT N 5 11 1 1 

HETEROCYCLIC COMPOUNDS N 287 97 123 246 

HETERODYNING N 307 438 5 253 

HETEROGENEITY N 470 315 37 369 

HETEROJUNCTION DEVICES N 120 2432 10 80 

HETEROJUNCTIONS N 300 776 5 226 

HETEROPHORIA N 0 3 1 5 

HETEROSPHERE N 4 7 1 4 

HETEROTROPH$ N 16 29 1 11 

HEURISTIC METHODS N 965 821 49 298 

HEUS ROCKET ENGINES N 0 1 0 21 

HEWLETT-PACKARD COMPUTERS N 133 50 5 27 

HEXAD I ENE N 3 5 0 6 

HEXAGONAL CELLS N 46 1642 2 21 

HEXAGONS N 39 71 1 19 

HEXAHEDRITE N 1 15 0 0 

HEXAMETHONIUM N 1 4 0 0 

HEXAMETHYLENETETRAMINE N 10 3 0 4 

HEXANITROSTILBENE N 10 8 0 2 

HEXENES N 37 10 1 24 

HEXDGENES (TRADEMARK) N 13 32 0 3 

HEXOKINASE N 2 9 1 4 

HEXOSES N 6 9 0 6 

HEXYL COMPOUNDS N 5 3 1 17 

HF LASERS N 197 583 0 219 

HFB-320 AIRCRAFT N 26 8 0 0 

HH-43 HELICOPTER N 0 2 0 1 

HIBERNATION N 25 122 12 28 

HIERARCHIES N 866 661 33 279 

HIGH ACCELERATION N 102 102 0 91 

HIGH ALT TARGET AND BACKGROUND MEASUREMENT N 0 0 0 5 

HIGH ALTITUDE N 729 530 16 1021 

HIGH ALTITUDE BALLOONS N 268 391 10 143 

HIGH ALTITUDE BREATHING N 56 204 1 37 

HIGH ALTITUDE ENVIRONMENTS N 143 511 5 117 

HIGH ALTITUDE NUCLEAR DETECTION N 12 44 1 17 

HIGH ALTITUDE PRESSURE N 25 46 1 28 

HIGH ALTITUDE TESTS N 76 162 6 158 

HIGH ASPECT RATIO N 111 158 1 52 

HIGH CURRENT N 160 771 5 152 

HIGH DEFINITION TELEVISION N 0 14 0 4 

HIGH DISPERSION SPECTROGRAPHS N 9 126 0 2 

HIGH ELECTRON MOBILITY TRANSISTORS N 30 318 0 18 

HIGH ENERGY ELECTRONS N 346 2091 14 157 

HIGH ENERGY FUELS N 48 20 1 72 

HIGH ENERGY INTERACTIONS N 2025 1860 142 707 

HIGH ENERGY OXIDIZERS N 16 5 1 92 

HIGH ENERGY PROPELLANTS N 90 54 0 339 

HIGH FIELD MAGNETS N 64 123 3 21 

HIGH FLUX BEAM REACTORS N 5 4 0 5 
910117 

NASA 

******* SUBJECT TERM ******* 

HIGH FLUX ISOTOPE REACTORS 

HIGH FREQUENCIES 

HIGH GAIN 

HIGH GRAVITY ENVIRONMENTS 

HIGH IMPULSE 

HIGH LEVEL LANGUAGES 

HIGH PASS FILTERS 

HIGH POLYMERS 

HIGH POWER LASERS 

HIGH PRESSURE 

HIGH PRESSURE OXYGEN 

HIGH RESISTANCE 

HIGH RESOLUTION 

COMBINED 

HIGH RESOLUTION COVERAGE ANTENNAS 

HIGH REYNOLDS NUMBER 

HIGH SPEED 

HIGH SPEED CAMERAS 

HIGH SPEED PHOTOGRAPHY 

HIGH STRENGTH 

HIGH STRENGTH ALLOYS 

HIGH STRENGTH STEELS 

HIGH TEMPERATURE 

HIGH TEMPERATURE AIR 

HIGH TEMPERATURE ENVIRONMENTS 

HIGH TEMPERATURE FLUIDS 

HIGH TEMPERATURE GAS COOLED REACTORS 

HIGH TEMPERATURE GASES 

HIGH TEMPERATURE LUBRICANTS 

HIGH TEMPERATURE NUCLEAR REACTORS 

HIGH TEMPERATURE PLASMAS 

HIGH TEMPERATURE PROPELLANTS 

HIGH TEMPERATURE RESEARCH 

HIGH TEMPERATURE SUPERCONDUCTORS 

HIGH TEMPERATURE TESTS 

HIGH THRUST 

HIGH VACUUM 

HIGH VACUUM ORBITAL SIMULATOR 

HIGH VOLTAGES 

HIGHLY 

HIGHLANDS 

MANEUVERABLE AIRCRAFT 

HILBERT 

HIGHWAYS 

SPACE 

HILBERT TRANSFORMATION 

HILL DETERMINANT 

HILL LUNAR THEORY 

HILL METHOD 

HILLER AIRCRAFT 

HILSCH TUBES 

HINGES 

HIMALAYAS 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

STAR 

74 

1932 

146 

12 

67 

117 

483 

72 

400 

1925 

75 

6 

2079 

8 

221 

1014 

706 

423 

202 

111 

342 

4222 

684 

111 

61 

62 

561 

99 

556 

211 

19 

1069 

456 

1126 

25 

191 

5 

849 

17 

52 

855 

752 

96 

2 

9 

21 

43 

17 

145 

STATISTICS 

IAA 

0 

3229 

151 

365 

20 

241 

246 

52 

2021 

2147 

116 

14 

4859 

13 

895 

1384 

280 

145 

945 

1762 

1490 

1505 

378 

1129 

62 

81 

1800 

76 

82 

2314 

15 

413 

6046 

2793 

96 

240 

4 

184 

868 

76 

179 

1084 

269 

36 

48 

211 

87 

68 

315 

NLN 

0 

61 

6 

9 

0 

0 

23 

28 

127 

0 

3 

52 

1 

0 

48 

16 

11 

10 

23 

60 

271 

5 

26 

0 

4 

23 

5 

1 

45 

40 

0 

62 

1 

22 

0 

46 

148 

123 

21 

3 

3 

0 

0 

7 

3 

5 

OTHER 

13 

1766 

137 

25 

45 

190 

54 

58 

782 

1651 

10 

60 

1558 

4 

103 

1065 

185 

54 

411 

393 

422 

3134 

74 

622 

30 

59 

439 

88 

196 

236 

43 

960 

87 

968 

48 

163 

5 

962 

39 

14 

301 

734 

21 

1 

3 

0 

3 

18 

5 

79 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

HIPPARCOS SATELLITE N 158 164 3 5 

HIPPOCAMPUS N 33 94 3 25 

HIPPURIC ACID N 3 1 0 0 

HIS BUNDLE N 6 48 3 1 

HISS N 46 284 0 15 

HISTAMINES N 22 54 5 32 

HISTIDINE N 15 15 1 4 

HISTOCHEMICAL ANALYSIS N 80 100 24 38 

HISTOGRAMS N 522 1862 6 299 

HISTOLOGY N 207 478 112 179 

HISTORIES N 1057 1203 2005 815 

HL-10 REENTRY VEHICLE N 15 9 0 22 

HLD-35 REENTRY VEHICLE N 0 0 0 1 

HMX N 163 114 0 309 

HODOGRAPHS N 103 522 14 40 

HODOSCOPES N 52 86 1 22 

HOHLRAUMS N 4 3 0 1 

HOLDERS N 85 24 1 133 

HOLDING N 8 20 0 10 

HOLE BURNING N 13 42 0 4 

HOLE DISTRIBUTION N 6 23 0 2 

HOLE DISTRIBUTION (ELECTRONICS) N 71 214 5 17 

HOLE DISTRIBUTION (MECHANICS) N 165 696 3 58 

HOLE GEOMETRY {MECHANICS) N 86 563 1 26 

HOLE MOBILITY N 123 228 1 21 

HOLES N 82 176 3 41 

HOLES (ELECTRON DEFICIENCIES) N 466 864 8 118 

HOLES (MECHANICS) N 247 1666 0 83 

HOLLOW N 27 63 0 18 

HOLLOW CATHODES N 201 450 8 69 

HOLMIUM N 107 118 1 45 

HOLMIUM ISOTOPES N 12 5 0 3 

HOLOGRAMMETRY N 75 193 9 51 

HOLOGRAPHIC INTERFEROMETRY N 434 1869 34 176 

HOLOGRAPHIC SPECTROSCOPY N 29 33 2 35 

HOLOGRAPHIC SUBTRACTION N 5 16 0 0 

HOLOGRAPHY N 1565 4555 264 1162 

HOMEOSTASIS N 139 247 25 90 

HOMEOTHERMS N 4 27 0 0 

HOMING N 80 49 3 433 

HOMING DEVICES N 145 255 11 1613 

HOMODYNE RECEPTION N 32 143 1 19 

HOMOGENEITY N 683 918 44 424 

HOMOGENEOUS TURBULENCE N 112 565 7 20 

HOMOGENIZING N 77 118 7 20 

HOMOJUNCTI ONS N 26 102 0 13 

HOMOLOGY N 126 77 64 100 

HOMOMORPHISMS N 195 66 19 98 

HOMOPOLAR GENERATORS N 22 78 1 42 

HOMO SPHERE N 7 11 2 25 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*-*-***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER T

HOMOTOPY THEORY N 120 55 37 55 

HOMOTROPY N 9 1 0 1 

HONDURAS N 6 4 2 4 

HONEST JOHN ROCKET VEHICLE N 55 1 0 80 

HONEYCOMB CORES N 134 237 2 195 

HONEYCOMB STRUCTURES N 425 836 6 484 

HONEYWELL ADEPT COMPUTER N 4 0 0 2 

HONEYWELL COMPUTERS N 43 10 4 28 

HONEYWELL DDP 116 COMPUTER N 2 0 0 0 

HONEYWELL 600/6000 COMPUTER N 7 0 0 5 

HONG KONG N 10 12 3 4 

HONING N 12 5 2 8 

HOOKES LAW N 74 454 8 26 

HOOKS N 33 14 3 56 

HOOP COLUMN ANTENNAS N 24 9 0 2 

HOOPS N 25 54 0 18 

HOPCALITE (TRADEMARK) N 8 3 0 4 

HOPPERS N 9 3 0 7 

HORIZON N 81 116 2 69 

HORIZON SCANNERS N 149 134 4 135 

HORIZONTAL BRANCH STARS N 6 314 1 1 

HORIZONTAL FLIGHT N 138 192 2 68 

HORIZONTAL ORIENTATION N 422 142 1 264 

HORIZONTAL SPACECRAFT LANDING N 25 35 0 34 

HORIZONTAL TAIL SURFACES N 93 99 1 94 

HORMONE METABOLISMS N 97 432 25 30 

HORMONES N 202 205 239 295 

HORN ANTENNAS N 221 1016 7 141 

HORNS N 24 30 3 16 

HORSEPOWER N 46 33 3 45 

HORSES N 8 12 4 5 

HORSESHOE VORTICES N 8 17 0 0 

HOSES N 49 29 4 222 

HOSPITALS N 72 24 87 122 

HOT ATOMS N 14 14 2 2 

HOT CATHODES N 39 99 0 23 

HOT CORROSION N 221 643 3 97 

HOT ELECTRONS N 205 783 10 61 

HOT ISOSTATIC PRESSING N 155 520 0 29 

HOT MACHINING N 16 20 0 17 

HOT PRESSING N 647 1703 12 504 2

HOT STARS N 154 1271 5 70 

HOT SURFACES N 107 198 3 85 

HOT WATER ROCKET ENGINES N 3 3 0 0 

HOT WEATHER N 35 52 1 37 

HOT WORKING N 265 687 23 230 

HOT-FILM ANEMOMETERS N 150 308 4 48 

HOT-WIRE ANEMOMETERS N 606 1608 11 268 2

HOT-WIRE FLOWMETERS N 172 407 1 56 

HOTOL LAUNCH VEHICLE N 6 40 0 21 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER T

HOTSHOT WIND TUNNELS N 16 32 2 12 

HOUND DDG MISSILE N 0 0 0 10 

HOUSEHOLDER TRANSFORMATIONS N 9 13 0 0 

HOUSEKEEPING (SPACECRAFT) N 35 38 0 14 

HOUSINGS N 184 94 17 164 

HOUSTON (TX) N 26 19 10 38 

HOVERCRAFT GROUND EFFECT MACHINES N 31 74 14 26 

HOVERING N 498 605 9 396 

HOVERING ROCKET VEHICLES N 0 3 0 4 

HOVERING STABILITY N 132 198 1 79 

HOWITZERS N 14 3 0 63 

HP-115 AIRCRAFT N 8 6 0 3 

HS-748 AIRCRAFT N 1 1 0 3 

HS-801 AIRCRAFT N 0 2 0 0 

HTPB PROPELLANTS N 21 121 0 102 

HUBBLE CONSTANT N 30 524 1 3 

HUBBLE DIAGRAM N 41 456 4 4 

HUBBLE SPACE TELESCOPE N 423 831 26 218 

HUBS N 174 234 0 128 

HUDSON BAY (CANADA) N 17 10 0 11 

HUDSON RIVER (NY-NJ) N 7 9 2 14 

HUECKEL THEORY N 19 18 8 9 

HUGHES AIRCRAFT N 5 19 0 33 

HUGONIOT EQUATION OF STATE N 130 171 0 81 

HULLS (STRUCTURES) N 67 62 11 156 

HUM N 4 1 0 3 

HUMAN BEHAVIOR N 796 554 565 624 2

HUMAN BEINGS N 860 417 469 1088 2

HUMAN BODY N 1170 812 208 549 2

HUMAN CENTRIFUGES N 96 237 3 49 

HUMAN FACTORS ENGINEERING N 5711 3336 665 4624 1

HUMAN FACTORS LABORATORIES N 67 38 1 96 

HUMAN PATHOLOGY N 247 1116 63 83 

HUMAN PERFORMANCE N 3110 2475 295 1848 7

HUMAN REACTIONS N 1404 2405 96 576 4

HUMAN RELATIONS N 30 23 55 21 

HUMAN RESOURCES N 142 26 75 179 

HUMAN TOLERANCES N 1091 987 94 448 2

HUMAN WASTES N 178 154 4 81 

HUMASON COMET N 0 3 0 1 

HUMERUS N 2 5 0 1 

HUMIDITY N 1749 1263 37 1634 4

HUMIDITY MEASUREMENT N 225 360 11 156 

HUNGARIAN SPACE PROGRAM N 1 0 0 0 

HUNGARY N 98 62 18 145 

HURRICANES N 459 330 35 183 

HUYGENS PRINCIPLE N 50 174 7 15 

HVITTIS CHONDRITE N 0 1 0 1 

HYBRID CIRCUITS N 302 490 43 412 

HYBRID COMPUTERS N 364 671 42 241 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER T

HYBRID NAVIGATION SYSTEMS N 48 81 2 13 

HYBRID PROPELLANT ROCKET ENGINES N 53 89 1 110 

HYBRID PROPELLANTS N 66 107 3 131 

HYBRID PROPULSION N 85 103 3 130 

HYBRID ROCKET ENGINES N 3 33 2 20 

HYBRID STRUCTURES N 80 211 2 64 

HYDRATES N 183 149 7 104 

HYDRATION N 163 124 14 107 

HYDRAULIC ANALOGIES N 57 118 12 37 

HYDRAULIC CONTROL N 191 484 56 168 

HYDRAULIC EQUIPMENT N 1033 1028 229 1569 3

HYDRAULIC FLUIDS N 267 242 46 415 

HYDRAULIC JETS N 112 144 2 95 

HYDRAULIC SHOCK N 20 70 1 10 

HYDRAULIC TEST TUNNELS N 237 169 1 112 

HYDRAULICS N 118 137 102 132 

HYDRAZIDES N 14 4 3 20 

HYDRAZINE BORANE N 1 1 0 7 

HYDRAZINE ENGINES N 125 298 0 83 

HYDRAZINE NITRATE N 10 9 1 18 

HYDRAZINE NITROFORM N 2 1 0 4 

HYDRAZINE PERCHLORATES N 0 4 0 14 

HYDRAZINES N 533 346 16 924 

HYDRAZINIUM COMPOUNDS N 13 6 0 16 

HYDRAZOIC ACID N 4 15 1 3 

HYDRAZONES N 15 13 0 15 

HYDRAZONIUM COMPOUNDS N 4 0 0 2 

HYDRIDES N 266 232 23 230 

HYDROBALLISTICS N 22 11 1 23 

HYDROBORA TI ON N 4 0 1 1 

HYDROBROMIC ACID N 16 38 0 5 

HYDROBROMIDES N 15 25 0 6 

HYDROCARBON COMBUSTION N 198 1255 9 79 

HYDROCARBON FUEL PRODUCTION N 89 276 6 59 

HYDROCARBON FUELS N 671 679 36 700 

HYDROCARBON POISONING N 29 14 1 12 

HYDROCARBONS N 2184 1511 269 1395 5

HYDROCHLORIC ACID N 328 397 4 193 

HYDROCHLORIDES N 39 20 2 17 

HYDROCLIMATOLOGY N 37 13 1 16 

HYDROCRACKING N 57 18 1 43 

HYDROCYANIC ACID N 92 493 1 49 

HYDRODYNAMIC COEFFICIENTS N 53 28 2 24 

HYDRODYNAMIC EQUATIONS N 482 2526 32 190 

HYDRODYNAMIC RAM EFFECT N 11 45 0 9 

HYDRODYNAMICS N 2496 2517 393 2012 7

HYDROELAST I CITY N 91 175 10 33 

HYDROELECTRIC POWER STATIONS N 234 184 34 178 

HYDROELECTRICITY N 66 20 3 81 

HYDROFLUORIC ACID N 249 315 3 167 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******"* SUBJECT TERM *•****"" TYPE STAR IAA NLN OTHER 

HYDROFOIL CRAFT N 68 88 22 160 

HYDROFOIL OSCILLATIONS N 20 39 2 10 

HYDROFOILS N 170 145 19 211 

HYDRO FORMING N 15 24 1 14 

HYDROGEN N 4756 6905 179 3139 1

HYDROGEN ATOMS N 473 2449 19 178 

HYDROGEN AZIDES N 0 6 0 1 

HYDROGEN BONOS N 225 197 30 100 

HYDROGEN CHLORIDES N 171 198 2 124 

HYDROGEN CLOUDS N 79 2350 4 27 

HYDROGEN COMPOUNDS N 276 270 12 189 

HYDROGEN EMBRITTLEMENT N 558 1318 37 230 

HYDROGEN ENGINES N 37 126 2 39 

HYDROGEN FUELS N 414 1033 47 431 

HYDROGEN IONS N 487 2348 17 223 

HYDROGEN ISOTOPES N 207 246 6 56 

HYDROGEN MASERS N 94 61 1 38 

HYDROGEN METABOLISM N 5 3 1 2 

HYDROGEN OXYGEN ENGINES N 253 342 1 463 

HYDROGEN OXYGEN FUEL CELLS N 144 163 2 102 

HYDROGEN PERCHLORATE N 1 1 0 2 

HYDROGEN PEROXIDE N 178 257 4 208 

HYDROGEN PLASMA N 332 1441 7 114 

HYDROGEN PRODUCTION N 414 861 20 230 

HYDROGEN RECOMBINATIONS N 60 321 1 18 

HYDROGEN SULFIDE N 248 307 4 121 

HYDROGEN 4 N 6 2 0 1 

HYDROGEN-BASED ENERGY N 201 782 21 72 

HYDROGENATION N 548 761 48 449 

HYOROGENOLYSIS N 33 20 2 21 

HYOROGENOMONAS N 29 22 2 34 

HYDROGEOLOGY N 517 198 59 501 

HYDROGRAPHY N 467 222 28 307 

HYDROLOGICAL CYCLE N 25 48 0 25 

HYDROLOGY N 2098 758 297 1640 

HYDROLOGY MODELS N 232 93 12 115 

HYDROLYSIS N 486 372 25 389 

HYOROMECHANICS N 97 116 51 123 

HYOROMETALLURGY N 59 28 5 36 

HYDROMETEOROLOGY N 616 496 46 384 

HYDROMETERS N 37 17 0 20 

HYDRONIUM IONS N 8 33 0 2 

HYDROPHONES N 223 30 2 448 

HYDROPLANES (SURFACES) N 4 5 0 8 

HYDROPLANES (VEHICLES) N 1 10 9 7 

HYDROPLANING N 70 20 3 32 

HYDROPONICS N 33 36 4 25 

HYOROPYRDLYSIS N 17 6 0 22 

HYOROSPINNING N 1 1 0 3 

HYDROSTATIC PRESSURE N 543 1021 19 400 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

HYDROSTATICS N 299 553 34 254 

HYDROSULFITES N 2 2 0 3 

HYDROTHERMAL CRYSTAL GROWTH N 43 32 2 35 

HYDROTHERMAL STRESS ANALYSIS N 25 69 0 10 

HYDROTHERMAL SYSTEMS N 114 87 9 82 

HYDROXIDES N 248 170 6 148 

HYDROXYCORTICOSTEROID N 18 31 0 8 

HYDROXYL COMPOUNDS N 183 236 11 193 

HYDROXYL EMISSION N 106 1417 1 28 

HYDROXYL RADICALS N 366 987 2 212 

HYDROXYLAMINE SULFATE N 4 2 0 1 

HYDROXYLAMMONIUM PERCHLORATES N 1 4 0 31 

HYGIENE N 172 155 172 186 

HYGRAL PROPERTIES N 41 73 1 10 

HYGROMETERS N 105 123 6 69 

HYGROSCOPICITY N 117 100 1 50 

HYLA-STAR ROCKET VEHICLE N 0 0 0 

HYLLERAAS COORDINATES N 5 17 0 3 

HYOSCINE N 12 34 0 9 

HYPERBARIC CHAMBERS N 161 169 14 72 

HYPERBOLAS N 90 104 3 36 

HYPERBOLIC COORDINATES N 46 42 3 14 

HYPERBOLIC DIFFERENTIAL EQUATIONS N 263 929 23 36 

HYPERBOLIC FUNCTIONS N 244 452 52 71 

HYPERBOLIC NAVIGATION N 68 57 3 80 

HYPERBOLIC REENTRY N 8 27 0 8 

HYPERBOLIC SYSTEMS N 22 227 0 14 

HYPERBOLIC TRAJECTORIES N 20 165 3 17 

HYPERCAPNIA N 77 296 2 13 

HYPERCUBE MULTIPROCESSORS N 158 206 0 21 

HYPERFINE STRUCTURE N 402 643 30 126 

HYPERGEOMETRIC FUNCTIONS N 179 379 32 43 

HYPERGLYCEMIA N 10 25 1 4 

HYPERGOLIC ROCKET PROPELLANTS N 91 121 0 222 

HYPER ION N 4 45 0 2 

HYPERKINESIA N 5 14 0 5 

HYPERNEA N 4 5 0 0 

HYPERNUCLEI N 37 1 2 14 

HYPERONS N 232 38 9 55 

HYPEROPIA N 1 9 1 0 

HYPEROXIA N 148 410 6 68 

HYPERPLANES N 60 127 2 13 

HYPERPNEA N 2 41 0 0 

HYPERSOMNIA N 2 2 2 0 

HYPERSONIC AIRCRAFT N 232 293 5 299 

HYPERSONIC BOUNDARY LAYER N 133 328 2 84 

HYPERSONIC COMBUSTION N 8 43 0 56 

HYPERSONIC FLIGHT N 162 384 12 333 

HYPERSONIC FLOW N 1157 2456 35 826 

HYPERSONIC FORCES N 19 13 2 23 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

HYPERSONIC GLIDERS N 11 26 0 47 

HYPERSONIC HEAT TRANSFER N 88 163 2 131 

HYPERSONIC INLETS N 36 47 1 89 

HYPERSONIC NOZZLES N 49 108 0 66 

HYPERSONIC REENTRY N 93 285 4 144 

HYPERSONIC SHOCK N 54 222 3 39 

HYPERSONIC SPEED N 449 229 3 581 

HYPERSONIC TEST APPARATUS N 41 75 1 58 

HYPERSONIC VEHICLES N 230 430 5 419 

HYPERSONIC WAKES N 97 232 6 146 

HYPERSONIC WIND TUNNELS N 224 284 11 287 

HYPERSONIC$ N 106 83 14 184 

HYPERSPACES N 60 258 21 16 

HYPERSPHERES N 18 20 1 5 

HYPERTENSIN N 0 2 0 0 

HYPERTENSION N 89 433 51 36 

HYPERTHERMIA N 82 309 4 33 

HYPERVELOCITY N 14 29 2 18 

HYPERVELOCITY FLOW N 51 110 1 36 

HYPERVELOCITY GUNS N 127 47 2 193 

HYPERVELOCITY IMPACT N 307 653 5 287 

HYPERVELOCITY LAUNCHERS N 74 37 0 30 

HYPERVELOCITY PROJECTILES N 260 253 1 293 

HYPERVELOCITY WIND TUNNELS N 209 270 6 242 

HYPERVENTILATION N 56 157 1 16 

HYPERVOLEMIA N 3 14 0 2 

HYPNOSIS N 2 1 37 17 16 

HYPOBARIC ATMOSPHERES N 62 158 0 16 

HYPOCAPNIA N 8 86 0 3 

HYPODERMIS N 0 2 0 1 

HYPODYNAMIA N 152 146 3 33 

HYPOELASTICITY N 0 30 2 0 

HYPOGLYCEMIA N 13 32 1 3 

HYPOKINESIA N 640 475 4 200 

HY POMET ABOLI SM N 5 16 0 2 

HYPOTENSION N 18 73 5 13 

HYPOTHALAMUS N 83 501 23 65 

HYPOTHERMIA N 141 301 7 74 

HYPOTHESES N 362 198 35 249 

HYPOTONIA N 9 22 0 1 

HYPOVENTI LAT ION N 4 28 1 1 

HYPOVOLEMIA N 2 45 0 9 

HYPOXEMIA N 19 98 1 3 

HYPOXIA N 572 1986 25 234 

HYPSOGRAPHY N 11 18 0 3 

HYPSOMETERS N 10 44 1 4 

HYSTERESIS N 752 1767 16 382 

I BEAMS N 51 107 2 20 

IAPETUS N 14 73 0 3 

IBM COMPUTERS N 359 86 171 164 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

IBM 1130 COMPUTER N 13 8 8 11 

IBM 1401 COMPUTER N 1 0 3 4 

IBM 1 4 10 COMPUTER N 2 0 0 11 

IBM 1620 COMPUTER N 21 2 8 42 

IBM 2250 COMPUTER N 4 4 0 4 

IBM 360 COMPUTER N 465 79 55 404 

IBM 370 COMPUTER N 95 25 12 25 

IBM 650 COMPUTER N 1 0 0 9 

IBM 7000 SERIES COMPUTERS N 0 0 0 0 

IBM 7030 COMPUTER N 8 2 1 7 

IBM 704 COMPUTER N 3 1 0 14 

IBM 7040 COMPUTER N 43 4 0 28 

IBM 7044 COMPUTER N 9 5 0 83 

IBM 7070 COMPUTER N 0 0 0 4 

IBM 7074 COMPUTER N 5 0 0 2 

IBM 709 COMPUTER N 0 1 1 3 

IBM 7090 COMPUTER N 52 2 2 83 

IBM 7094 COMPUTER N 118 7 1 718 

ICARUS ASTEROID N 6 35 0 3 

ICE N 1103 1315 62 651 

ICE CLOUDS N 80 182 0 16 

ICE ENVIRONMENTS N 155 186 21 154 

ICE FLOES N 63 60 0 48 

ICE FORMATION N 942 834 22 655 

ICE MAPPING N 285 323 15 159 

ICE NUCLEI N 220 317 5 77 

ICE PREVENTION N 152 152 6 180 

ICE REPORTING N 317 279 5 201 

ICEBERGS N 94 49 6 49 

ICELAND N 125 56 10 34 

ICELANDIC SPACE PROGRAM N 0 0 0 0 

ICHTHYOLOGY N 9 0 5 5 

ICL COMPUTERS N 20 6 0 1 

ICOSAHEDRONS N 18 130 0 4 

ICY SATELLITES N 25 112 0 8 

IDAHO N 138 50 36 147 

IDEAL FLUIDS N 107 1581 22 28 

IDEAL GAS N 244 1840 41 73 

IDENTIFYING N 567 845 78 751 

IDENTITIES N 58 30 1 28 

IDLERS N 2 15 0 6 

IFF SYSTEMS (IDENTIFICATION) N 18 46 1 168 

IGNEOUS ROCKS N 239 476 54 178 

IGNITERS N 142 108 0 406 

IGNITION N 1158 733 47 1277 

IGNITION LIMITS N 150 752 6 125 

IGNITION SYSTEMS N 162 228 14 312 

IGNITION TEMPERATURE N 191 481 4 143 

IGNITRONS N 10 16 0 17 

IL-14 AIRCRAFT N 1 7 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*+***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

IL-62 AIRCRAFT N 1 38 0 4 

ILLIAC COMPUTERS N 18 1 2 33 

ILLIAC 3 COMPUTER N 3 2 0 3 

ILLIAC 4 COMPUTER N 45 27 2 61 

ILLINOIS N 306 88 26 260 

ILLITE N 7 8 0 3 

ILLUMINANCE N 137 203 6 59 

ILLUMINATING N 293 321 58 241 

ILLUMINATION N 100 425 9 112 

ILLUMINATORS N 40 73 2 84 

ILLUSIONS N 55 68 7 22 

ILMENITE N 35 211 3 16 

ILYUSHIN AIRCRAFT N 9 38 2 13 

IMAGE ANALYSIS N 828 1669 14 192 

IMAGE CONTRAST N 416 1326 15 186 

IMAGE CONVERTERS N 226 456 39 277 

IMAGE CORRELATORS N 221 410 5 107 

IMAGE DISSECTOR TUBES N 75 107 1 66 

IMAGE ENHANCEMENT N 821 1519 26 370 

IMAGE FILTERS N 182 423 11 82 

IMAGE FURNACES N 37 14 1 13 

IMAGE INTENSIFIERS N 447 499 26 1090 

IMAGE MOTION COMPENSATION N 150 409 3 124 

IMAGE ORTHICONS N 43 48 1 75 

IMAGE PROCESSING N 4995 7310 310 2016 1

IMAGE RECONSTRUCTION N 388 1493 9 104 

IMAGE RESOLUTION N 711 1453 13 225 

IMAGE ROTATION N 25 92 0 10 

IMAGE TRANSDUCERS N 63 240 4 19 

IMAGE TUBES N 165 374 14 347 

IMAGE VELOCITY SENSORS N 26 40 3 21 

IMAGERY N 1691 132 103 743 

IMAGES N 1153 153 75 980 

IMAGING RADAR N 63 35 2 43 

IMAGING SPECTROMETERS N 154 211 0 92 

IMAGING TECHNIQUES N 3572 5909 486 2155 1

IMBEDDINGS N 4 12 1 3 

IMBEDDINGS (MATHEMATICS) N 97 112 13 42 

IMBLMS N 7 1 0 79 

IMIDES N 105 97 3 84 

I MINES N 56 36 4 40 

IMLSS N 2 1 0 1 

IMMOBILIZATION N 183 177 8 106 

IMMUNE SYSTEMS N 58 120 0 8 

IMMUNITY N 103 100 56 224 

IMMUNOASSAY N 31 9 11 62 

IMMUNOLOGY N 281 409 240 393 

IMP N 121 191 1 121 

IMPACT N 418 223 49 656 

IMPACT ACCELERATION N 145 123 2 74 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*'****** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

IMPACT DAMAGE N 797 1517 21 678 

IMPACT FUSION N 10 7 0 17 

IMPACT LOADS N 786 1549 14 399 

IMPACT MELTS N 8 169 0 10 

IMPACT PREDICTION N 308 215 3 808 

IMPACT RESISTANCE N 382 424 8 356 

IMPACT STRENGTH N 417 631 18 328 

IMPACT TESTING MACHINES N 40 90 3 39 

IMPACT TESTS N 1428 1177 44 1329 

IMPACT TOLERANCES N 106 80 8 77 

IMPACTORS N 74 95 2 42 

IMPAIRMENT N 16 10 3 9 

IMPEDANCE N 591 272 16 420 

IMPEDANCE MATCHING N 328 1170 14 308 

IMPEDANCE MEASUREMENT N 241 813 13 120 

IMPEDANCE PROBES N 53 76 2 13 

IMPELLERS N 230 479 10 145 

IMPERIAL VALLEY (CA) N 34 22 3 22 

IMPINGEMENT N 234 185 5 267 

IMPLANTATION N 226 112 22 190 

IMPLANTED ELECTRODES (BIOLOGY) N 42 108 1 28 

IMPLICATION N 19 4 1 1 12 

IMPLOSIONS N 355 367 0 101 

IMPREGNATING N 188 175 2 221 

IMPROVEMENT N 198 20 21 225 

IMPULSE GENERATORS N 70 74 4 78 

IMPULSES N 263 328 9 159 

IMPURITIES N 2508 2851 67 1417 

IN-FLIGHT MONITORING N 617 1206 7 270 

INCANDESCENCE N 35 44 3 63 

INCENDIARY AMMUNITION N 24 3 1 114 

INCENTIVE TECHNIQUES N 50 24 21 21 

INCENTIVES N 178 35 95 181 

INCIDENCE N 657 583 2 263 

INCIDENT RADIATION N 297 2663 2 107 

INCINERATORS N 180 166 47 193 

INCLINATION N 54 304 0 39 

INCLUSIONS N 362 1464 15 148 

INCOHERENCE N 76 294 3 34 

INCOHERENT SCATTER RADAR N 72 403 0 27 

INCOHERENT SCATTERING N 262 742 4 123 

INCOME N 26 16 93 47 

INCOMPATIBILITY N 7 13 3 12 

INCOMPRESSIBILITY N 120 432 6 32 

INCOMPRESSIBLE BOUNDARY LAYER N 84 438 3 24 

INCOMPRESSIBLE FLOW N 1858 5560 45 518 

INCOMPRESSIBLE FLUIDS N 384 3401 23 162 

INCONEL (TRADEMARK) N 325 566 1 299 

INCREASING N 9 2 0 5 

INDENE N 2 1 0 3 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *-****** TYPE STAR IAA NLN OTHER 

INDENTATION N 87 315 2 33 

INDEPENDENT VARIABLES N 2384 2967 54 1863 

INDEXES N 34 43 106 34 

INDEXES (DOCUMENTATION) N 1718 111 3699 1590 

INDEXES (RATIOS) N 185 323 6 84 

INDIA N 420 913 64 461 

INDIAN OCEAN N 270 378 29 175 

INDIAN SPACE PROGRAM N 69 155 0 26 

INDIAN SPACECRAFT N 27 123 0 24 

INDIANA N 161 39 14 128 

INDICATING INSTRUMENTS N 229 205 20 242 

INDICATION N 0 1 1 1 

INDICATORS N 14 19 3 25 

INDIUM N 407 295 11 289 

INDIUM ALLOYS N 132 134 1 66 

INDIUM ANTIMONIDE$ N 286 897 3 240 

INDIUM ARSENIDES N 184 979 1 117 

I NO IUM COMPOUNDS N 214 450 2 129 

INDIUM ISOTOPES N 11 6 0 8 

INDIUM PHOSPHATES N 28 19 0 11 

INDIUM PHOSPHIDE$ N 396 1605 2 194 

INDIUM SULFIDES N 8 48 0 2 

INDIUM TELLURIDES N 2 30 0 6 

INDOLES N 26 35 0 13 

INDONESIA N 57 145 16 36 

INDONESIAN SPACE PROGRAM N 1 8 0 1 

INDOOR AIR POLLUTION N 29 13 2 11 

INDUCTANCE N 344 513 21 362 

INDUCTION N 44 101 6 38 

INDUCTION (MATHEMATICS) N 67 36 16 8 

INDUCTION HEATING N 215 248 14 141 

INDUCTION MOTORS N 178 209 31 106 

INDUCTORS N 174 283 21 252 

INDUSTRIAL AREAS N 88 184 14 58 

INDUSTRIAL ENERGY N 634 500 63 546 

INDUSTRIAL MANAGEMENT N 496 378 1483 586 

INDUSTRIAL PLANTS N 1096 510 335 1127 

INDUSTRIAL SAFETY N 601 309 386 573 

INDUSTRIAL WASTES N 1044 422 133 939 

INDUSTRIES N 1866 182 2326 2055 

INELASTIC COLLISIONS N 296 751 13 89 

INELASTIC SCATTERING N 1231 608 40 386 

INELASTIC STRESS N 135 94 3 18 

INEQUALITIES N 708 1330 54 260 

INERT ATMOSPHERE N 75 209 2 65 

INERTIA N 444 1310 22 277 

INERTIA BONDING N 2 2 0 2 

INERTIA PRINCIPLE N 46 144 1 20 

INERTIAL CONFINEMENT FUSION N 403 111 4 68 

INERTIAL COORDINATES N 53 134 3 32 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

INERTIAL FUSION (REACTOR) N 111 265 8 27 

INERTIAL GUIDANCE N 294 393 23 943 

INERTIAL NAVIGATION N 741 1483 67 1263 

INERTIAL PLATFORMS N 264 414 4 369 

INERTIAL REFERENCE SYSTEMS N 173 373 5 117 

INERTIAL UPPER STAGE N 67 145 1 121 

INERTIALESS STEERABLE ANTENNAS N 5 7 0 4 

INFARCTION N 7 120 4 3 

INFECTIOUS DISEASES N 163 109 106 361 

INFERENCE N 416 110 51 89 

INFESTATION N 133 111 16 16 

INFILTRATION N 90 98 2 65 

INFINITE SPAN WINGS N 35 57 1 10 

INFINITY N 129 104 20 37 

INFLATABLE GLIDERS N 3 2 0 4 

INFLATABLE SPACECRAFT N 17 10 0 7 

INFLATABLE STRUCTURES N 291 231 14 313 

INFLATING N 74 148 1 42 

INFLECTION POINTS N 21 31 0 4 

INFLUENCE COEFFICIENT N 67 234 7 43 

INFLUENZA N 19 11 4 13 

INFORMATION N 251 65 217 186 

INFORMATION ADAPTIVE SYSTEM N 12 7 0 11 

INFORMATION DISSEMINATION N 1640 347 449 1125 

INFORMATION FLOW N 502 358 82 280 

INFORMATION MANAGEMENT N 1171 384 389 854 

INFORMATION PROCESSING (BIOLOGY) N 302 172 0 34 

INFORMATION RETRIEVAL N 2682 390 745 2755 

INFORMATION SYSTEMS N 3726 1089 1439 3170 

INFORMATION THEORY N 1940 1440 477 1433 

INFORMATION TRANSFER N 176 50 9 140 

INFRARED ABSORPTION N 189 1179 6 90 

INFRARED ASTRONOMY N 620 3848 60 443 

INFRARED ASTRONOMY SATELLITE N 247 1340 3 76 

INFRARED CIRRUS (ASTRONOMY) N 0 10 0 0 

INFRARED DETECTORS N 1397 2302 90 4285 

INFRARED FILTERS N 80 193 3 100 

INFRARED IMAGERY N 1036 2467 38 1080 

INFRARED INSPECTION N 52 142 7 39 

INFRARED INSTRUMENTS N 270 567 70 555 

INFRARED INTERFEROMETERS N 85 341 2 89 

INFRARED LASERS N 783 3777 41 915 

INFRARED PHOTOGRAPHY N 591 810 38 305 

INFRARED PHOTOMETRY N 63 576 0 10 

INFRARED RADAR N 25 82 3 50 

INFRARED RADIATION N 2443 3308 150 3428 

INFRARED RADIOMETERS N 314 1032 12 243 

INFRARED REFLECTION N 108 439 6 92 

INFRARED SCANNERS N 520 898 16 657 

INFRARED SIGNATURES N 41 82 1 245 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM "'****** TYPE STAR IAA NLN OTHER 

INFRARED SOURCES (ASTRONOMY) N 14 552 0 17 

INFRARED SPACE OBSERVATORY (ISO) N 29 37 0 2 

INFRARED SPECTRA N 2243 4690 193 1624 

INFRARED SPECTROMETERS N 438 710 27 517 

INFRARED SPECTROPHOTOMETERS N 125 272 5 94 

INFRARED SPECTROSCOPY N 1290 1744 189 805 

INFRARED STARS N 61 670 1 19 

INFRARED SUPPRESSION N 9 6 1 32 

INFRARED TELESCOPES N 186 584 10 180 

INFRARED TRACKING N 101 120 6 978 

INFRARED WINDOWS N 87 251 3 84 

INFRASONIC FREQUENCIES N 115 188 3 55 

INGESTION N 7 2 0 3 

INGESTION (BIOLOGY) N 27 21 2 32 

INGESTION (ENGINES) N 100 78 0 135 

INGOTS N 222 317 7 214 

INGREDIENTS N 6 3 3 30 

INGRESS (SPACECRAFT PASSAGEWAY) N 6 0 0 4 

INHABITANTS N 6 3 5 8 

INHIBITION N 30 73 1 22 

INHIBITION (PSYCHOLOGY) N 21 58 1 7 

INHIBITORS N 234 267 23 249 

INHOMOGENEITY N 625 3582 26 271 

INHOUR EQUATION N 3 0 0 0 

INITIATION N 125 58 3 56 

INITIATORS N 8 5 1 13 

INITIATORS (EXPLOSIVES) N 158 147 5 365 

INJECTION N 427 203 17 414 

INJECTION GUIDANCE N 38 58 0 107 

INJECTION LASERS N 144 1442 15 123 

INJECTION LOCKING N 48 282 0 13 

INJECTION MOLDING N 93 237 10 85 

INJECTORS N 429 322 7 970 

INJUN SATELLITES N 20 19 0 11 

INJUN 1 SATELLITE N 1 1 0 4 

INJUN 3 SATELLITE N 18 12 0 5 

INJUN 4 SATELLITE N 2 0 0 0 

INJURIES N 321 171 99 373 

INKS N 54 19 15 39 

INLAND WATERS N 58 70 15 31 

INLET AIRFRAME CONFIGURATIONS N 37 22 0 70 

INLET FLOW N 929 2232 6 547 

INLET NOZZLES N 187 184 1 216 

INLET PRESSURE N 204 188 0 176 

INLET TEMPERATURE N 129 151 1 93 

INLETS (TOPOGRAPHY) N 25 9 3 25 

INLIERS (LANDFORMS) N 0 0 0 3 

INNER RADIATION BELT N 36 162 0 13 

INOCULATION N 72 46 3 56 

INOCULUM N 1 5 2 1 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *******' TYPE STAR IAA NLN OTHER 

INORGANIC CHEMISTRY N 60 29 310 86 

INORGANIC COATINGS N 24 95 4 28 

INORGANIC COMPOUNDS N 358 166 168 247 

INORGANIC MATERIALS N 74 116 11 51 

INORGANIC NITRATES N 27 26 0 50 

INORGANIC PEROXIDES N 37 29 2 21 

INORGANIC SULFIDES N 15 132 2 7 

!NOS ITOLS N 1 4 1 5 

INPUT N 1227 528 88 986 

INPUT/OUTPUT ROUTINES N 1786 321 151 1592 

INSECTICIDES N 55 17 59 59 

INSECTS N 247 126 136 179 

INSERTION N 43 31 4 41 

INSERTION LOSS N 140 864 0 192 

INSERTS N 52 82 2 60 

INSOLATION N 549 1014 12 219 

INSOMNIA N 23 33 10 9 

INSPECTION N 899 798 150 1329 

INSPECTOR SATELLITE N 0 0 0 5 

INSPIRATION N 5 19 4 7 

INSTALLATION MANUALS N 59 1 8 60 

INSTALLING N 481 170 28 720 

INSTANTONS N 16 12 3 19 

INSTITUTIONS N 36 17 92 46 

INSTRUCTION SETS (COMPUTERS) N 113 93 7 62 

INSTRUCTORS N 121 74 29 147 

INSTRUMENT APPROACH N 174 105 7 60 

INSTRUMENT COMPENSATION N 242 1102 2 115 

INSTRUMENT ERRORS N 661 6067 23 361 

INSTRUMENT FLIGHT RULES N 260 236 23 93 

INSTRUMENT LANDING SYSTEMS N 560 578 20 257 

INSTRUMENT ORIENTATION N 165 387 3 103 

INSTRUMENT PACKAGES N 265 473 7 213 

INSTRUMENT RECEIVERS N 16 28 2 12 

INSTRUMENT TRANSFORMERS N 15 17 4 17 

INSTRUMENT TRANSMITTERS N 21 27 1 19 

INSTRUMENTS N 436 214 207 747 

INSULATED STRUCTURES N 41 67 3 47 

INSULATION N 704 217 101 1149 

INSULATORS N 354 312 75 202 

INSULIN N 38 112 10 42 

INSURANCE (CONTRACTS) N 15 50 0 95 

INTAKE SYSTEMS N 582 225 11 907 

INTASAT SATELLITE N 8 11 0 0 

INTEGERS N 362 121 39 137 

INTEGRAL CALCULUS N 150 454 92 69 

INTEGRAL EQUATIONS N 2872 12060 387 1065 1

INTEGRAL ROCKET RAMJETS N 3 14 0 34 

INTEGRAL TRANSFORMATIONS N 411 682 55 232 

INTEGRALS N 282 79 38 67 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

INTEGRATED CIRCUITS N 3664 5838 734 5892 1

INTEGRATED ENERGY SYSTEMS N 150 29 5 72 

INTEGRATED GLOBAL OCEAN STATION SYSTEMS N 8 1 2 1 

INTEGRATED LIBRARY SYSTEMS N 10 4 6 7 

INTEGRATED MISSION CONTROL CENTER N 25 20 1 86 

INTEGRATED OPTICS N 163 1351 41 141 

INTEGRATORS N 140 327 6 137 

INTEGRITY N 40 38 4 46 

INTEL 8080 MICROPROCESSOR N 35 24 11 7 

INTELLECT N 30 19 55 13 

INTELLIGENCE N 126 115 71 519 

INTELLIGIBILITY N 180 37 5 104 

INTELSAT SATELLITES N 155 1251 29 206 

INTENSIFIERS N 3 3 2 11 

INTENSITY N 157 65 1 109 

INTERACTING GALAXIES N 33 438 0 5 

INTERACTIONAL AERODYNAMICS N 116 1222 2 50 

INTERACTIONS N 283 140 32 207 

INTERACTIVE CONTROL N 203 473 44 65 

INTERATOMIC FORCES N 151 317 7 34 

INTERCALATION N 81 144 2 22 

INTERCEPTION N 128 201 2 460 

INTERCEPTORS N 7 83 0 210 

INTERCONTINENTAL BALLISTIC MISSILES N 30 102 5 231 

INTERCOSMOS SATELLITES N 70 612 5 58 

INTERCRANIAL CIRCULATION N 12 15 1 4 

INTERDIGITAL TRANSDUCERS N 6 76 0 0 

INTERFACE STABILITY N 203 753 9 86 

INTERFACES N 2736 836 175 2364 

INTERFACIAL ENERGY N 148 184 12 74 

INTERFACIAL TENSION N 942 1538 31 535 

INTERFERENCE N 215 314 11 155 

INTERFERENCE DRAG N 190 82 1 87 

INTERFERENCE FACTOR TABLE N 7 7 0 16 

INTERFERENCE FIT N 73 52 0 7 

INTERFERENCE GRATING N 74 318 1 38 

INTERFERENCE IMMUNITY N 32 153 0 13 

INTERFERENCE LIFT N 134 51 2 46 

INTERFEROMETERS N 1030 1436 67 974 

INTERFEROMETRY N 1090 3123 115 689 

INTERFERON N 19 29 11 48 

INTERGALACTIC MEDIA N 154 1378 7 39 

INTERGRANULAR CORROSION N 183 624 11 79 

INTERIM STAGES (SPACECRAFT) N 18 29 0 15 

INTERIOR BALLISTICS N 268 86 6 904 

INTERLAYERS N 103 299 2 54 

INTERMEDIATE FREQUENCIES N 102 321 1 47 

INTERMEDIATE FREQUENCY AMPLIFIERS N 52 153 2 64 

INTERMEDIATE RANGE BALLISTIC MISSILES N 1 4 0 17 

I NTERMETALLI CS N 708 2397 26 333 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

INTERMITTENCY N 74 302 3 28 

INTERMITTENCY HYPOTHESIS N 5 6 0 1 

INTERMODULATION N 139 501 1 96 

INTERMOLECULAR FORCES N 260 407 37 113 

INTERNAL COMBUSTION ENGINES N 815 376 122 544 

INTERNAL COMPRESSION INLETS N 32 19 1 17 

INTERNAL CONVERSION N 59 5 5 27 

INTERNAL ENERGY N 110 422 10 84 

INTERNAL FRICTION N 231 708 15 84 

INTERNAL PRESSURE N 214 850 2 145 

INTERNAL WAVES N 214 733 4 465 

INTERNATIONAL COOPERATION N 2749 4397 1259 1615 1

INTERNATIONAL FIELD YEAR FOR GREAT LAKES N 17 12 0 12 

INTERNATIONAL GEOPHYSICAL YEAR N 65 182 22 50 

INTERNATIONAL GEOSPHERE-BIOSPHERE PROGRAM N 5 5 0 3 

INTERNATIONAL HYDROLOGICAL DECADE N 6 0 0 5 

INTERNATIONAL LAW N 115 884 102 125 

INTERNATIONAL MAGNETOSPHERIC EXPLORER N 4 7 2 3 

INTERNATIONAL MAGNETOSPHERIC STUDY N 90 103 2 7 

INTERNATIONAL QUIET SUN YEAR N 69 207 10 20 

INTERNATIONAL RELATIONS N 190 320 191 301 

INTERNATIONAL SATELLITE GEODESY EXPERIMENT N 2 2 0 0 

INTERNATIONAL SUN EARTH EXPLORER 1 N 70 202 0 14 

INTERNATIONAL SUN EARTH EXPLORER 2 N 55 100 0 7 

INTERNATIONAL SUN EARTH EXPLORER 3 N 126 373 1 24 

INTERNATIONAL SUN EARTH EXPLORERS N 107 351 1 83 

INTERNATIONAL SYSTEM OF UNITS N 154 37 163 66 

INTERNATIONAL TRADE N 330 92 117 395 

INTERNUCLEAR PROPERTIES N 20 82 0 6 

INTERORBITAL TRAJECTORIES N 9 20 1 2 

INTERPHONES N 2 0 0 10 

INTERPLANETARY COMMUNICATION N 39 50 0 10 

INTERPLANETARY DUST N 273 1015 23 121 

INTERPLANETARY FLIGHT N 330 624 93 269 

INTERPLANETARY GAS N 56 230 4 38 

INTERPLANETARY MAGNETIC FIELDS N 887 4143 25 235 

INTERPLANETARY MEDIUM N 461 1965 23 206 

INTERPLANETARY NAVIGATION N 62 147 5 25 

INTERPLANETARY SPACE N 403 1124 27 182 

INTERPLANETARY SPACECRAFT N 289 565 26 296 

INTERPLANETARY TRAJECTORIES N 220 333 7 158 

INTERPLANETARY TRANSFER ORBITS N 49 97 0 26 

INTERPOLATION N 1257 1997 115 486 

INTERPRETATION N 50 90 10 41 

INTERPROCESSOR COMMUNICATION N 598 489 12 232 

INTERROGATION N 158 90 4 190 

INTERRUPTION N 64 34 1 44 

INTERSECTIONS N 87 66 4 30 

INTERSERVICE DATA EXCHANGE PROGRAM N 9 0 3 17 

INTERSTELLAR CHEMISTRY N 154 1224 9 38 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

INTERSTELLAR COMMUNICATION N 17 206 33 12 

INTERSTELLAR EXTINCTION N 234 3033 5 28 

INTERSTELLAR GAS N 499 5080 31 156 

INTERSTELLAR MAGNETIC FIELDS N 107 1431 16 42 

INTERSTELLAR MASERS N 47 963 2 1 

INTERSTELLAR MATTER N 895 6607 126 409 

INTERSTELLAR RADIATION N 159 652 15 76 

INTERSTELLAR SPACE N 194 400 23 76 

INTERSTELLAR SPACECRAFT N 7 100 2 4 

INTERSTELLAR TRAVEL N 18 265 9 10 

INTERSTICES N 23 44 3 11 

INTERSTITIAL$ N 428 588 10 139 

INTERSYMBOLIC INTERFERENCE N 26 341 1 3 

INTERTROPICAL CONVERGENT ZONES N 54 129 2 17 

INTERVALS N 476 180 12 262 

INTERVERTEBRAL DISKS N 22 11 1 10 

INTESTINES N 59 119 16 68 

INTOXICATION N 47 68 5 51 

INTRACRANIAL CAVITY N 1 9 0 1 

INTRACRANIAL PRESSURE N 12 15 1 4 

INTRAMOLECULAR STRUCTURES N 92 46 2 26 

INTRAOCULAR PRESSURE N 22 45 0 13 

INTRAORBIT TRANSFER VEHICLES N 6 1 0 1 

INTRAVASCULAR SYSTEM N 9 37 2 6 

INTRAVEHICULAR ACTIVITY N 63 53 3 37 

INTRAVENOUS PROCEDURES N 14 39 2 13 

INTROVERSION N 2 10 1 1 

INTRUSION N 81 40 11 104 

INVARIANCE N 865 1568 40 274 

INVARIANT IMBEDDINGS N 114 208 28 42 

INVENTIONS N 408 43 141 388 

INVENTORIES N 409 70 46 321 

INVENTORY CONTROLS N 187 49 37 288 

INVENTORY MANAGEMENT N 162 67 45 173 

INVERSE KINEMATICS N 51 71 0 1 

INVERSE SCATTERING N 146 367 7 63 

INVERSIONS N 619 426 19 355 

INVERTEBRATES N 58 34 67 89 

INVERTED CONVERTERS (DC TO AC) N 81 115 3 37 

INVERTERS N 155 272 15 245 

INVESTIGATION N 300 15 107 450 

INVESTMENT N 15 53 7 77 

INVESTMENT CASTING N 37 63 2 47 

INVESTMENTS N 227 228 112 224 

INVISCID FLOW N 1702 4888 22 655 

INVOLUNTARY ACTIONS N 6 26 1 3 

IO N 177 869 1 113 

IODATES N 15 40 0 8 

IODIDES N 178 337 6 106 

IODIMETRY N 2 3 1 3 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

IODINE N 405 368 14 212 

IODINE COMPOUNDS N 90 115 1 60 

IODINE ISOTOPES N 88 64 0 33 

IODINE LASERS N 85 461 3 135 

IODINE 125 N 18 4 0 8 

IODINE 131 N 38 8 0 20 

IODINE 132 N 2 0 0 0 

IODOACETIC ACID N 1 2 0 0 

ION ACCELERATORS N 258 399 6 120 

ION ACOUSTIC WAVES N 200 1719 4 44 

ION ATOM INTERACTIONS N 242 334 3 83 

ION BEAMS N 1801 2174 71 742 

ION CHARGE N 111 294 6 44 

ION CONCENTRATION N 219 479 9 99 

ION CURRENTS N 490 862 12 171 

ION CYCLOTRON RADIATION N 327 1175 14 61 

ION DENSITY (CONCENTRATION) N 646 1397 7 249 

ION DISTRIBUTION N 358 1082 9 108 

ION EMISSION N 226 373 15 99 

ION ENGINES N 452 926 8 302 

ION EXCHANGE MEMBRANE ELECTROLYTES N 121 103 5 58 

ION EXCHANGE RESINS N 178 39 15 115 

ION EXCHANGING N 590 207 96 321 

ION EXTRACTION N 117 88 6 41 

ION IMPACT N 100 408 10 53 

ION IMPLANTATION N 1184 1418 69 620 

ION INJECTION N 256 469 7 103 

ION IRRADIATION N 344 479 1 1 153 

ION MICROSCOPES N 138 122 13 43 

ION MOTION N 242 1401 9 73 

ION PLATING N 91 77 3 37 

ION PROBES N 115 231 2 87 

ION PRODUCTION RATES N 151 1125 4 52 

ION PROPULSION N 380 392 18 132 

ION PUMPS N 53 73 3 53 

ION RECOMBINATION N 138 531 7 62 

ION SCATTERING N 255 319 16 86 

ION SELECTIVE ELECTRODES N 73 14 21 33 

ION SHEATHS N 50 88 2 17 

ION SOURCES N 805 648 25 373 

ION STORAGE N 16 6 0 9 

ION STRIPPING N 14 3 0 4 

ION TEMPERATURE N 497 2361 2 122 

ION TRAPS (INSTRUMENTATION) N 99 165 3 40 

IONIC COLLISIONS N 435 1156 32 145 

IONIC CRYSTALS N 156 230 44 62 

IONIC DIFFUSION N 187 477 7 40 

IONIC MOBILITY N 254 354 21 97 

IONIC REACTIONS N 204 729 25 127 

IONIC WAVES N 132 658 9 37 
NASA COMBINED FILE POSTING STATISTICS 

910117 

'*'****** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

IONIZATION N 1941 1086 141 1206 

IONIZATION CHAMBERS N 374 433 11 186 

IONIZATION COEFFICIENTS N 74 335 1 42 

IONIZATION CROSS SECTIONS N 439 1145 5 205 

IONIZATION FREQUENCIES N 39 87 0 36 

IONIZATION GAGES N 87 122 4 57 

IONIZATION POTENTIALS N 336 725 11 141 

IONIZED GASES N 514 2265 247 241 

IONIZERS N 47 54 1 66 

IONIZING RADIATION N 920 1311 105 750 

IONOGRAMS N 220 720 1 271 

IONOPAUSE N 11 56 0 3 

IONDSDNDES N 214 371 0 189 

IONOSPHERES N 28 58 0 21 

IONOSPHERIC COMPOSITION N 260 871 9 216 

IONOSPHERIC CONDUCTIVITY N 104 726 1 31 

IONOSPHERIC CROSS MODULATION N 14 62 0 8 

IONOSPHERIC CURRENTS N 223 1925 4 77 

IONOSPHERIC DISTURBANCES N 1011 3079 27 560 

IONOSPHERIC DRIFT N 184 1334 7 80 

IONOSPHERIC ELECTRON DENSITY N 733 6163 23 254 

IONOSPHERIC F-SCATTER PROPAGATION N 65 128 0 27 

IONOSPHERIC HEATING N 133 619 0 56 

IONOSPHERIC ION DENSITY N 185 1767 3 95 

IONOSPHERIC NOISE N 53 112 4 31 

IONOSPHERIC PROPAGATION N 1661 5743 96 1204 

IONOSPHERIC SOUNDING N 875 3667 19 677 

IONOSPHERIC STORMS N 77 211 1 26 

IONOSPHERIC TEMPERATURE N 70 502 1 46 

IONOSPHERIC TILTS N 2 15 0 0 

IONOSPHERICS N 88 65 9 69 

IONS N 1778 279 196 1265 

IOWA N 114 42 6 82 

IPAD N 24 6 1 7 

IRAN N 54 48 8 50 

IRAQ N 2 17 2 3 

IRAS-ARAKI-ALCOCK COMET N 5 48 0 2 

IRELAND N 13 27 14 21 

IRIDESCENCE N 2 2 1 1 

IRIDIUM N 246 225 4 168 

IRIDIUM ISOTOPES N 28 7 1 12 

IRIS SATELLITES N 17 42 0 10 

IRISES (MECHANICAL APERTURES) N 50 79 2 31 

IRON N 2480 3896 153 1166 

IRON ALLOYS N 1456 2577 69 645 

IRON CHLORIDES N 52 43 0 23 

IRON COMPOUNDS N 509 462 11 273 

IRON CYANIDES N 21 8 0 5 

IRON ISOTOPES N 106 93 2 31 

IRON METEORITES N 80 669 8 53 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

IRON ORES N 68 23 16 39 

IRON OXIDES N 320 436 5 188 

IRON 57 N 51 45 0 14 

IRON 58 N 0 2 0 0 

IRON 59 N 25 11 0 3 

IRRADIANCE N 306 867 7 96 

IRRADIATION N 2671 710 86 1995 

IRRATIONALITY N 2 7 3 3 

IRREGULAR GALAXIES N 16 240 0 2 

IRREGULAR VARIABLE STARS N 10 99 0 1 

IRREGULARITIES N 90 215 3 40 

IRREVERSIBLE PROCESSES N 118 604 37 74 

IRRIGATION N 358 188 31 230 

IRRITATION N 28 17 1 29 

ISCHEMIA N 31 402 11 37 

ISENTROPE N 40 36 0 14 

ISENTROPIC PROCESSES N 179 610 5 55 

ISING MODEL N 21 11 0 0 

ISIS SATELLITES N 43 180 0 50 

ISIS-A N 18 29 0 32 

ISIS-B N 14 68 1 43 

ISIS-X N 0 0 0 2 

ISLAND ARCS N 25 36 12 5 

ISLANDS N 199 118 30 173 

ISOBARS N 10 77 0 6 

ISOBARS (PRESSURE) N 105 216 0 69 

ISOCHORIC PROCESSES N 26 55 0 8 

ISOCHROMATICS N 33 204 1 7 

ISOCYANATE$ N 112 23 9 204 

ISOELECTRONIC SEQUENCE N 14 258 1 11 

ISOENERGETIC PROCESSES N 11 39 0 4 

ISOLATION N 298 149 24 418 

ISOLATORS N 93 141 6 105 

ISOMERIZATION N 173 86 16 102 

ISOMERS N 315 241 15 162 

ISOMORPHISM N 213 131 13 106 

ISOPARAMETRIC FINITE ELEMENTS N 48 382 1 6 

ISOPERIMETRIC PROBLEM N 20 41 5 3 

ISOPHOTES N 39 456 0 13 

ISOPROPYL ALCOHOL N 25 18 2 11 

ISOPROPYL COMPOUNDS N 27 10 0 13 

ISOPROPYL NITRATE N 1 12 0 11 

ISOPYCNIC PROCESSES N 20 29 0 5 

ISOSTASY N 33 73 7 32 

ISOSTATIC PRESSURE N 152 333 4 132 

ISOTENSOIO STRUCTURES N 8 11 0 6 

ISOTHERMAL FLOW N 140 505 2 46 

ISOTHERMAL LAYERS N 54 195 0 24 

ISOTHERMAL PROCESSES N 409 1639 8 186 

ISOTHERMS N 395 492 3 245 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**'***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ISOTONICITY N 12 17 0 9 

ISOTOPE EFFECT N 270 439 18 89 

ISOTOPE SEPARATION N 338 299 31 141 

ISOTOPES N 722 646 82 530 

ISOTOPIC ENRICHMENT N 25 158 0 14 

ISOTOPIC LABELING N 492 321 38 216 

ISOTOPIC SPIN N 108 8 4 25 

ISOTROPIC MEDIA N 328 4721 13 109 

ISOTROPIC TURBULENCE N 107 725 6 43 

ISOTROPISM N 196 149 4 74 

ISOTROPY N 353 713 10 131 

ISRAEL N 74 83 25 115 

ISRAELI SPACE PROGRAM N 0 2 0 5 

ISRO N 15 23 0 11 

ISTHMUSES N 3 2 0 0 

ITALIAN SPACE PROGRAM N 30 190 0 20 

ITALY N 442 535 76 407 

ITCHING N 1 0 2 1 

ITERATION N 1885 1215 22 593 

ITERATIVE NETWORKS N 61 49 2 27 

ITERATIVE SOLUTION N 2005 8097 73 531 1

ITO (SEMICONDUCTORS) N 2 29 0 1 

ITOS SATELLITES N 25 17 1 18 

ITOS 1 N 20 25 0 5 

ITOS 2 N 3 0 0 4 

ITOS 3 N 2 0 0 4 

ITOS 4 N 3 2 0 1 

IUE N 1073 1987 14 128 

IVORY COAST N 8 30 1 1 

IVUNA METEORITE N 1 6 0 0 

I2S CAMERAS N 9 0 0 1 

J INTEGRAL N 143 930 1 15 

J-2 ENGINE N 20 6 0 158 

J-33 ENGINE N 0 4 0 3 

J-34 ENGINE N 0 0 0 3 

J-47 ENGINE N 1 4 0 3 

J-52 ENGINE N 5 1 0 48 

J-57 ENGINE N 9 3 0 38 

J-57-P-20 ENGINE N 0 0 0 4 

J-58 ENGINE N 7 4 0 7 

J-65 ENGINE N 3 2 0 20 

J-69-T-25 ENGINE N 0 0 0 

J-71 ENGINE N 0 0 0 

J-73 ENGINE N 0 0 0 1 

J-75 ENGINE N 7 2 0 4 

J-79 ENGINE N 14 13 0 73 

J-85 ENGINE N 54 26 0 37 

J-93 ENGINE N 2 2 0 8 

J-97 ENGINE N 11 1 0 4 

JACKETS N 41 19 2 55 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

JACKS N 0 2 0 0 

JACKS (LIFTS) N 25 13 0 23 

JACOBI INTEGRAL N 68 267 11 25 

JACOBI MATRIX METHOD N 199 603 12 44 

JAGUAR AIRCRAFT N 13 37 0 7 

JAGUAR ROCKET VEHICLE N 0 0 0 1 

JAHN-TELLER EFFECT N 12 16 4 1 

JAMAICA N 6 20 1 10 

JAMMERS N 23 91 4 186 

JAMMING N 378 543 2 1784 

JANUS N 1 1 1 0 0 

JANUS REACTOR N 1 0 1 0 

JANUS SPACECRAFT N 1 3 0 2 

JAPAN N 792 939 237 1051 

JAPANESE SPACE PROGRAM N 136 785 4 170 

JAPANESE SPACECRAFT N 77 659 0 46 

JATO ENGINES N 0 3 0 42 

JAVELIN ROCKET VEHICLE N 28 13 0 24 

JEANS THEORY N 18 252 0 4 

JERBOAS N 0 2 0 0 

JET AIRCRAFT N 720 843 105 2283 

JET AIRCRAFT NOISE N 983 1159 33 495 

JET AMPLIFIERS N 16 68 1 14 

JET BLAST EFFECTS N 64 36 0 33 

JET BOUNDARIES N 76 128 0 21 

JET CONDENSERS N 6 8 0 9 

JET CONTROL N 59 128 6 65 

JET ENGINE FUELS N 712 440 9 778 

JET ENGINES N 845 1053 39 1081 

JET EXHAUST N 375 445 9 296 

JET FLAPS N 207 201 4 152 

JET FLOW N 1291 3050 26 662 

JET IMPINGEMENT N 316 915 1 150 

JET LAG N 25 30 1 11 

JET LIFT N 97 88 3 58 

JET MEMBRANE PROCESS N 3 0 0 0 

JET MIXING FLOW N 678 1197 7 311 

JET NOZZLES N 77 275 2 42 

JET PROPULSION N 162 173 104 166 

JET PROVOST AIRCRAFT N 2 0 0 0 

JET PUMPS N 45 43 6 42 

JET STREAMS (METEOROLOGY) N 295 545 7 108 

JET THRUST N 150 253 1 132 

JET VANES N 42 52 0 33 

JETS N 27 59 3 31 

JETSTREAM AIRCRAFT N 4 3 0 2 

JETTISON SYSTEMS N 51 29 0 172 

JETTISONING N 55 34 0 75 

JFET N 29 109 1 23 

JIGS N 20 16 11 68 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

JIMSPHERE BALLOONS N 19 14 0 5 

JINDIVIK TARGET AIRCRAFT N 4 5 1 6 

JODRELL BANK OBSERVATORY N 0 23 2 4 

JOHNSTON ISLAND N 4 1 0 11 

JOINED WINGS N 7 20 0 10 

JOINING N 91 93 19 93 

JOINT EUROPEAN TORUS N 8 1 0 1 

JOINTS (ANATOMY) N 91 102 22 34 

JOINTS (JUNCTIONS) N 1438 1500 115 1162 

JORDAN N 5 11 1 2 

JORDAN FORM N 49 104 4 15 

JOSEPHSON JUNCTIONS N 417 1310 24 170 

JOUKOWSKI TRANSFORMATION N 26 68 0 6 

JOULE-THOMSON EFFECT N 62 66 2 38 

JOURNAL BEARINGS N 267 531 17 200 

JOURNALS N 15 6 24 12 

JP-4 JET FUEL N 114 44 0 101 

JP-5 JET FUEL N 52 27 0 71 

JP-6 JET FUEL N 0 1 0 3 

JP-8 JET FUEL N 21 5 0 13 

JUDGMENTS N 227 141 19 64 

JUDI-DART ROCKET N 1 0 0 2 

JUICES N 2 0 0 1 

JUMPERS N 7 6 0 10 

JUNCTION DIDOES N 171 1287 14 108 

JUNCTION TRANSISTORS N 158 585 40 269 

JUNCTIONS N 29 86 3 41 

JUNO LAUNCH VEHICLES N 0 0 0 5 

JUNO 1 LAUNCH VEHICLE N 0 1 0 1 

JUNO 2 LAUNCH VEHICLE N 0 0 0 21 

JUPITER (PLANET) N 715 2383 69 713 

JUPITER ATMOSPHERE N 389 2048 12 291 

JUPITER C ROCKET VEHICLE N 1 1 0 4 

JUPITER MISSILE N 1 5 0 20 

JUPITER PROBES N 89 207 10 94 

JUPITER PROJECT N 27 21 3 12 

JUPITER RED SPOT N 33 223 3 14 

JUPITER RINGS N 16 87 1 14 

JUPITER SATELLITES N 33 122 1 44 

K LINES N 86 777 1 47 

K STARS N 84 580 0 13 

K-EPSILON TURBULENCE MODEL N 208 658 0 17 

KA-6 SAILPLANES N 1 0 0 0 

KAKUTANI THEOREM N 1 1 1 1 

KALAHARI BASIN (AFRICA) N 2 2 0 0 

KALMAN FILTERS N 1196 2562 41 565 

KALMAN-SCHMIDT FILTERING N 241 158 10 150 

KAMACITE N 4 127 1 6 

KAMAN AIRCRAFT N 1 3 0 

KANSAS N 313 104 11 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

KAOLINITE N 42 43 0 36 

KAON PRODUCTION N 50 4 0 12 

KAONS N 615 69 9 114 

KAPITZA RESISTANCE N 21 27 1 7 

KAPOETA ACHONDRITE N 3 15 0 3 

KAPPA ROCKET VEHICLES N 0 5 1 0 

KAPPA 8 ROCKET VEHICLE N 0 2 0 0 

KAPPA 9 ROCKET VEHICLE N 0 2 0 0 

KAPTON (TRADEMARK) N 183 160 1 55 

KARHUNEN-LOEVE EXPANSION N 30 91 0 4 

KARL FISCHER REAGENT N 5 3 0 0 

KARMAN VORTEX STREET N 64 293 0 14 

KARMAN-BODEWADT FLOW N 8 12 0 1 

KARST N 9 13 4 5 

KAWASAKI AIRCRAFT N 0 3 0 2 

KEELS N 19 9 1 10 

KEL-F N 11 2 0 6 

KELVIN-HELMHOLTZ INSTABILITY N 97 710 0 27 

KENTUCKY N 121 25 32 130 

KENYA N 34 53 6 22 

KEPLER LAWS N 154 886 11 35 

KERATINS N 1 6 2 3 

KERATITIS N 6 4 0 1 

KERNEL FUNCTIONS N 679 1289 27 186 

KEROGEN N 23 55 4 22 

KEROSENE N 197 320 5 97 

KERR CELLS N 45 77 1 34 

KERR EFFECTS N 14 258 3 6 

KERR ELECTROOPTICAL EFFECT N 58 146 2 15 

KERR MAGNETOOPTICAL EFFECT N 53 53 1 23 

KETENES N 9 20 0 4 

KETONES N 223 140 35 154 

KETTLES (GEOLOGY) N 2 0 0 0 

KEVLAR (TRADEMARK) N 309 781 2 214 

KEYING N 34 25 6 29 

KEYS (ISLANDS) N 3 2 0 3 

KIDNEY DISEASES N 21 27 8 8 

KIDNEYS N 161 188 44 134 

KILOMETER WAVE ORBITING TELESCOPE N 4 4 0 0 

KILOMETRIC WAVES N 31 244 0 8 

KINEMATIC EQUATIONS N 138 608 7 40 

KINEMATICS N 1596 1837 223 603 

KINESTHESIA N 20 43 4 10 

KINETIC ENERGY N 1876 4842 36 929 

KINETIC EQUATIONS N 482 2645 24 178 

KINETIC FRICTION N 53 134 2 25 

KINETIC HEATING N 58 142 0 63 

KINETIC THEORY N 613 2176 171 248 

KINETICS N 1281 540 299 1143 

KINO FORM N 5 12 0 6 
NASA COMBINED FILE POSTING STATISTICS 

910117 

- -** * SUBJECT TERM ..... .., .. *"** TYPE STAR IAA NLN OTHER 

KIRCHHOFF LAW N 15 172 2 4 

KIRCHHOFF LAW OF NETWORKS N 33 64 7 12 

KIRCHHOFF LAW OF RADIATION N 73 182 1 31 

KIRKENDALL EFFECT N 14 28 1 5 

KITS N 27 14 4 107 

KIWI B REACTORS N 0 0 0 68 

KIWI B-1 REACTOR N 1 0 0 26 

KIWI B-4 REACTOR N 1 0 0 51 

KIWI REACTORS N 3 3 0 85 

KJELDAHL METHOD N 9 8 0 2 

KLEBSIELLA N 3 4 0 4 

KLEIN-DUNHAM POTENTIAL N 2 4 1 0 

KLEIN-GORDON EQUATION N 44 139 3 11 

KLYSTRONS N 318 644 10 245 

KNEE (ANATOMY) N 20 28 2 17 

KNOBS N 3 9 0 6 

KNOOP HARDNESS N 18 61 0 8 

KNOWLEDGE N 305 124 78 61 

KNOWLEDGE BASES (ARTIFICIAL INTELLIGENCE) N 254 200 0 46 

KNOWLEDGE REPRESENTATION N 352 220 0 61 

KNUDSEN FLOW N 156 679 2 72 

KNUDSEN GAGES N 45 44 1 20 

KNURLING N 1 2 0 0 

KOHOUTEK COMET N 65 237 3 31 

KOLMOGOROFF THEORY N 103 668 1 23 

KOLMOGOROFF-SMIRNOFF TEST N 55 70 2 23 

KONDO EFFECT N 17 15 0 1 

KOREA N 14 7 3 32 

KORTEWEG-DEVRIES EQUATION N 62 424 2 11 

KOSSEL PATTERN N 4 6 0 3 

KOVAR (TRADEMARK) N 22 15 0 22 

KP INDEX N 11 459 0 1 

KRAFT PROCESS (WOODPULP) N 5 1 4 3 

KRAMERS-KRONIG FORMULA N 14 46 0 5 

KREBS CYCLE N 3 15 1 8 

KREEP N 6 98 0 3 

KRIGING N 15 2 0 1 

KROOK EQUATION N 12 80 0 1 

KRYPTON N 344 555 8 183 

KRYPTON FLUORIDE LASERS N 102 296 1 19 

KRYPTON ISOTOPES N 50 110 1 28 

KRYPTON 85 N 76 40 1 37 

KUIPER AIRBORNE OBSERVATORY N 1 1 0 1 

KURILE ISLANDS N 9 9 1 4 

KURTOSIS N 16 22 0 4 

KUTTA-JOUKOWSKI CONDITION N 89 166 1 25 

KUWAIT N 2 12 1 3 

KWIC INDEXES N 29 0 2 18 

L-SAT N 19 46 0 2 

L-1011 AIRCRAFT N 81 177 1 28 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

L-2000 AIRCRAFT N 0 0 0 10 

L-29 JET TRAINER N 0 2 0 0 

LABOR N 110 44 434 201 

LABORATORIES N 838 158 341 1430 

LABORATORY EQUIPMENT N 634 329 118 656 

LABRADOR N 23 34 2 15 

LABYRINTH N 91 146 10 33 

LABYRINTH SEALS N 52 66 0 20 

LABYRINTHECTOMY N 10 26 2 2 

LACATE (EXPERIMENT) N 1 0 0 1 

LACQUERS N 35 40 7 42 

LACTATES N 65 190 1 35 

LACTIC ACID N 23 93 1 16 

LACTOSE N 4 6 1 10 

LACUNAS N 0 3 0 2 

LADDERS N 16 41 1 10 

LAGEOS (SATELLITE) N 108 193 1 39 

LAGOONS N 57 25 5 43 

LAGRANGE COORDINATES N 293 484 15 97 

LAGRANGE MULTIPLIERS N 441 1124 33 170 

LAGRANGE SIMILARITY HYPOTHESIS N 66 54 2 28 

LAGRANGIAN EQUILIBRIUM POINTS N 49 383 1 16 

LAGUERRE FUNCTIONS N 67 148 5 23 

LAKE CHAMPLAIN BASIN (NY-VT) N 27 1 0 13 

LAKE ERIE N 52 25 4 37 

LAKE HURON N 21 12 1 17 

LAKE ICE N 72 38 3 21 

LAKE MICHIGAN N 59 58 3 60 

LAKE ONTARIO N 61 50 2 44 

LAKE PONTCHARTRAIN (LA) N 3 2 0 1 

LAKE SUPERIOR N 31 14 3 20 

LAKE TAHOE (CA-NV) N 3 8 0 7 

LAKE TEXOMA (OK-TX) N 1 0 0 0 

LAKES N 890 284 75 825 

LALLEMAND CAMERAS N 6 28 0 1 

LAMB WAVES N 70 194 6 17 

LAMBDA ROCKET VEHICLES N 0 6 0 1 

LAMBDA TAURI STARS N 0 0 0 4 

LAMBERT SURFACE N 33 1 1 1 1 15 

LAME FUNCTIONS N 19 239 5 2 

LAME WAVE EQUATIONS N 12 59 0 3 

LAMELLA N 10 82 1 9 

LAMELLA (METALLURGY) N 23 77 0 10 

LAMINAR BOUNDARY LAYER N 1231 3367 40 761 

LAMINAR FLOW N 2555 6650 132 1235 1

LAMINAR FLOW AIRFOILS N 98 109 1 80 

LAMINAR HEAT TRANSFER N 95 521 8 61 

LAMINAR MIXING N 48 145 2 27 

LAMINAR WAKES N 53 193 1 35 

LAMINATES N 2698 8409 101 2063 1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM  •**  TYPE STAR IAA NLN OTHER 

LANCE MISSILE N 168 3 0 253 

LAND N 162 64 41 161 

LAND ICE N 133 221 8 61 

LAND MANAGEMENT N 420 310 67 269 

LAND MOBILE SATELLITE SERVICE N 147 232 0 44 

LAND USE N 2984 1724 272 1524 

LANDAU DAMPING N 238 1006 1 68 

LANDAU FACTOR N 106 185 9 32 

LANDAU-GINZBURG EQUATIONS N 50 128 6 8 

LANDFILLS N 69 7 4 34 

LANDFORMS N 290 193 41 157 

LANDING N 127 42 12 237 

LANDING AIDS N 406 402 20 486 

LANDING GEAR N 400 670 24 737 

LANDING INSTRUMENTS N 52 99 2 52 

LANDING LOADS N 102 115 2 104 

LANDING MATS N 21 1 0 29 

LANDING MODULES N 52 51 1 28 

LANDING RADAR N 19 20 0 37 

LANDING SIMULATION N 182 205 3 98 

LANDING SITES N 199 229 2 334 

LANDING SPEED N 42 86 0 41 

LANDMARKS N 47 77 3 35 

LANDSAT E N 38 0 0 8 

LANDSAT F N 39 1 0 5 

LANDSAT FOLLOW-ON MISSIONS N 7 10 0 1 

LANDSAT SATELLITES N 2002 3950 163 904 

LANDSAT 1 N 684 603 4 90 

LANDSAT 2 N 65 67 1 17 

LANDSAT 3 N 33 35 4 17 

LANDSAT 4 N 449 276 10 56 

LANDSAT 5 N 127 73 2 3 

LANDSLIDES N 56 25 21 31 

LANGEVIN FORMULA N 48 198 1 13 

LANGLEY COMPLEX COORDINATOR N 1 2 1 0 

LANGUAGE PROGRAMMING N 544 201 140 377 

LANGUAGES N 265 100 631 303 

LANTHANUM N 164 125 2 69 

LANTHANUM ALLOYS N 39 87 0 17 

LANTHANUM CHLORIDES N 10 6 0 8 

LANTHANUM COMPOUNDS N 183 357 4 55 

LANTHANUM FLUORIDES N 12 39 0 15 

LANTHANUM ISOTOPES N 19 15 0 4 

LANTHANUM OXIDES N 83 284 0 21 

LANTHANUM TELLURIDES N 1 2 0 2 

LAOS N 11 2 1 9 

LAP JOINTS N 137 396 3 67 

LAPLACE EQUATION N 314 1132 30 104 

LAPLACE TRANSFORMATION N 827 2876 200 336 

LAPSE RATE N 30 43 0 12 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LARGE APERTURE SEISMIC ARRAY N 60 1 0 91 

LARGE AREA CROP INVENTORY EXPERIMENT N 426 62 4 25 

LARGE DEPLOYABLE REFLECTOR N 58 56 0 61 

LARGE SCALE INTEGRATION N 701 1047 112 661 

LARGE SPACE STRUCTURES N 1566 2132 41 644 

LARGOS SATELLITE N 2 0 0 0 

LARMOR PRECESSION N 52 167 0 8 

LARMOR RADIUS N 71 274 1 10 

LARVAE N 37 18 3 36 

LARYNX N 12 15 1 3 

LASER ALTIMETERS N 52 67 0 47 

LASER ANEMOMETERS N 314 598 14 89 

LASER ANNEALING N 118 192 7 61 

LASER APPLICATIONS N 3100 5606 303 2754 1

LASER ARRAYS N 0 0 0 0 

LASER BEAMS N 483 1445 0 213 

LASER CAVITIES N 388 2935 2 399 

LASER CUTTING N 48 89 5 57 

LASER DAMAGE N 330 499 13 819 

LASER DOPPLER VELOCIMETERS N 1076 2262 53 368 

LASER DRILLING N 33 140 4 22 

LASER FUSION N 463 1112 27 206 

LASER GUIDANCE N 35 65 3 261 

LASER GYROSCOPES N 91 297 1 84 

LASER HEATING N 398 2399 13 221 

LASER INDUCED FLUORESCENCE N 426 856 1 78 

LASER INTERFEROMETRY N 243 683 7 108 

LASER MATERIALS N 689 2473 33 570 

LASER MICROSCOPY N 30 39 1 24 

LASER MODE LOCKING N 140 1951 7 41 

LASER MODES N 341 4891 30 268 

LASER OUTPUTS N 3307 18013 96 3166 2

LASER PLASMA INTERACTIONS N 214 1140 21 62 

LASER PLASMAS N 667 2810 34 318 

LASER POWER BEAMING N 43 51 1 13 

LASER PROPULSION N 68 150 1 51 

LASER PUMPING N 741 2022 15 635 

LASER RANGE FINDERS N 466 760 12 509 

LASER RANGER/TRACKER N 131 262 3 219 

LASER SPECTROMETERS N 65 130 3 64 

LASER SPECTROSCOPY N 549 1969 73 358 

LASER STABILITY N 93 1423 3 81 

LASER TARGET DESIGNATORS N 45 35 0 318 

LASER TARGET INTERACTIONS N 131 765 9 168 

LASER TARGETS N 377 677 2 264 

LASER WEAPONS N 117 64 5 703 

LASER WELDING N 163 236 9 73 

LASER WINDOWS N 83 152 0 104 

LASERS N 4136 1203 731 5762 1

LASING N 167 2408 20 148 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LATCH-UP N 29 53 0 13 

LATCHES N 114 25 0 96 

LATE STARS N 127 2088 4 38 

LATENESS N 4 5 0 1 

LATENT HEAT N 434 522 0 47 

LATERAL CONTROL N 315 628 2 305 

LATERAL OSCILLATION N 46 95 1 19 

LATERAL STABILITY N 356 342 13 303 

LATERITES N 5 9 0 6 

LATEX N 116 38 7 86 

LATHES N 61 45 8 59 

LATIN SQUARE METHOD N 12 8 2 0 

LATITUDE N 499 1701 11 252 

LATITUDE MEASUREMENT N 91 254 0 52 

LATTICE PARAMETERS N 514 1526 12 189 

LATTICE VIBRATIONS N 407 368 39 145 

LATTICES N 30 125 7 46 

LATTICES (MATHEMATICS) N 485 168 77 149 

LATVIA N 1 0 0 1 

LAUE METHOD N 34 53 4 18 

LAUGHING N 0 1 2 0 

LAUNCH DATES N 120 34 4 131 

LAUNCH ESCAPE SYSTEMS N 21 15 0 199 

LAUNCH VEHICLE CONFIGURATIONS N 266 338 4 514 

LAUNCH VEHICLES N 709 1305 60 1912 

LAUNCH WINDOWS N 157 145 1 269 

LAUNCHERS N 104 165 4 251 

LAUNCHING N 278 99 13 1257 

LAUNCHING BASES N 135 168 15 269 

LAUNCHING PADS N 72 72 2 183 

LAUNCHING SITES N 166 146 9 538 

LAVA N 227 381 14 127 

LAVAL NUMBER N 24 57 1 14 

LAW N 3 4 21 24 

LAW (JURISPRUDENCE) N 668 435 1136 614 

LAWRENCIUM N 11 0 0 1 

LAWS N 87 31 150 74 

LAY-UP N 38 120 0 34 

LAYERS N 144 117 9 127 

LAYOUTS N 2 "5 118 50 102 

LAZAREV METEORITE N 0 1 0 0 

LC CIRCUITS N 35 399 0 29 

LEACHING N 281 89 15 158 

LEAD (METAL) N 989 718 54 628 

LEAD ACETATES N 4 4 0 14 

LEAD ACID BATTERIES N 234 100 4 92 

LEAD ALLOYS N 201 236 8 127 

LEAD CHLORIDES N 11 10 0 9 

LEAD COMPOUNDS N 283 241 12 221 

LEAD ISOTOPES N 89 172 3 37 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LEAD MOLYBDATES N 8 9 0 1 

LEAD ORGANIC COMPOUNDS N 10 7 0 2 

LEAD OXIDES N 92 198 2 59 

LEAD POISONING N 13 9 5 25 

LEAD SELENIDES N 31 114 0 30 

LEAD SULFIDES N 59 131 2 50 

LEAD TELLURIDES N 126 259 1 130 

LEAD TITANATES N 66 58 0 17 

LEAD TUNGSTATES N 5 1 0 0 

LEAD ZIRCDNATE TITANATES N 24 19 0 7 

LEADERSHIP N 124 36 380 118 

LEADING EDGE FLAPS N 48 61 0 94 

LEADING EDGE SLATS N 88 58 1 112 

LEADING EDGE SWEEP N 65 49 0 45 

LEADING EDGE THRUST N 11 6 0 9 

LEADING EDGES N 1210 2292 8 868 

LEAF AREA INDEX N 84 142 0 11 

LEAKAGE N 987 736 15 1756 

LEAR JET AIRCRAFT N 62 55 1 30 

LEARNING N 630 305 242 355 

LEARNING CURVES N 45 31 5 28 

LEARNING THEORY N 124 183 24 61 

LEASING N 16 27 2 64 

LEAST SQUARES METHOD N 3212 4763 110 1136 

LEATHER N 16 6 7 24 

LEAVES N 195 281 4 90 

LEBANON N 3 6 2 51 

LEBESGUE THEOREM N 92 75 23 28 

LECTURES N 248 18 904 150 

LEDGES N 1 7 0 1 

LEE WAVES N 91 203 1 20 

LEG (ANATOMY) N 106 200 9 39 

LEGAL LIABILITY N 143 998 131 118 

LEGENDRE FUNCTIONS N 314 1074 37 109 

LEGIBILITY N 44 27 2 26 

LEGUMINOUS PLANTS N 22 10 4 18 

LEIDENFROST PHENOMENON N 16 33 0 3 

LENGTH N 376 306 6 320 

LENNARD-JONES GAS N 57 83 0 20 

LENNARD-JONES POTENTIAL N 8 18 0 0 

LENS ANTENNAS N 71 215 2 103 

LENS DESIGN N 219 1140 33 128 

LENSES N 611 956 104 645 

LENTICULAR BODIES N 18 97 0 11 

LEONID METEOROIDS N 8 73 0 2 

LEPTONS N 367 231 24 147 

LESIONS N 146 198 3 111 

LESOTHO N 2 6 0 0 

LESSER ANTILLES N 5 9 0 3 

LETHALITY N 122 93 2 269 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LETHARGY N 2 9 0 2 

LEUCINE N 17 45 0 6 

LEUKEMIAS N 23 13 4 13 

LEUKOCYTES N 96 164 11 134 

LEUKOPENIA N 3 12 0 4 

LEVEL N 6 3 0 7 

LEVEL (HORIZONTAL) N 51 24 2 31 

LEVEL (QUANTITY) N 238 25 1 500 

LEVELING N 67 27 3 82 

LEVERS N 27 26 0 23 

LEVIT AT ION N 121 145 2 137 

LEVITATION MELTING N 23 40 0 24 

LEIIIIS BASE N 18 9 0 8 

LEIIIIS NUMBERS N 29 172 0 6 

LEXAN (TRADEMARK) N 38 42 0 17 

LIABILITIES N 19 14 30 22 

LIAPUNOV FUNCTIONS N 539 2717 61 150 

LIBERIA N 3 2 3 3 

LIBRARIES N 863 56 1341 894 

LIBRATION N 98 582 11 52 

LIBRATIDNAL MOTION N 50 415 4 16 

LIBYA N 13 13 5 4 

LIBYAN DESERT N 6 7 1 2 

LICENSING N 77 27 35 131 

LICHENS N 24 15 3 11 

LIE GROUPS N 422 436 121 154 

LIECHTENSTEIN N 0 0 1 0 

LIENARO POTENTIAL N 5 9 0 0 

LIES N 2 0 5 0 

LIFE (DURABILITY) N 2491 1454 66 3432 

LIFE CYCLE COSTS N 867 1066 27 952 

LIFE DETECTORS N 54 128 13 97 

LIFE RAFTS N 27 54 0 67 

LIFE SCIENCES N 533 573 372 673 

LIFE SPAN N 52 97 37 39 

LIFE SUPPORT SYSTEMS N 1407 1298 100 1306 

LIFEBOATS N 5 2 1 6 

LIFT N 1340 2287 27 1162 

LIFT AUGMENTATION N 346 344 5 175 

LIFT DEVICES N 402 310 8 358 

LIFT DRAG RATIO N 528 717 1 577 

LIFT FANS N 204 126 1 180 

LIFTING BODIES N 421 770 7 363 

LIFTING REENTRY VEHICLES N 107 165 1 354 

LIFTING ROTORS N 123 138 2 54 

LIFTOFF (LAUNCHING) N 44 58 0 6 

LIFTS N 6 3 0 23 

LIGAMENTS N 23 20 2 9 

LIGANDS N 377 53 35 154 

LIGHT (VISIBLE RADIATION) N 1425 2083 258 1185 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LIGHT ADAPTATION N 84 212 4 40 

LIGHT AIRBORNE MULTIPURPOSE SYSTEM N 3 15 0 15 

LIGHT AIRCRAFT N 300 682 36 199 

LIGHT ALLOYS N 48 149 15 29 

LIGHT AMPLIFIERS N 122 1584 14 126 

LIGHT BEAMS N 398 3689 31 260 

LIGHT CURVE N 286 5761 7 27 

LIGHT ELEMENTS N 80 262 0 39 

LIGHT EMISSION N 436 1522 24 316 

LIGHT EMITTING DIODES N 375 879 22 247 

LIGHT GAS GUNS N 106 40 3 69 

LIGHT HELICOPTERS N 59 167 0 53 

LIGHT INTRATHEATER TRANSPORT N 0 2 0 20 

LIGHT IONS N 82 36 0 20 

LIGHT MODULATION N 419 3085 31 323 

LIGHT SCATTERING N 2062 6760 179 1059 1

LIGHT SCATTERING METERS N 56 57 2 19 

LIGHT SOURCES N 511 1213 42 405 

LIGHT SPEED N 77 475 13 38 

LIGHT TRANSMISSION N 1344 3374 83 967 

LIGHT TRANSPORT AIRCRAFT N 4 8 0 7 

LIGHT VALVES N 27 43 1 16 

LIGHT WATER N 8 3 0 2 

LIGHT WATER BREEDER REACTORS N 50 22 5 26 

LIGHT WATER REACTORS N 37 4 1 22 

LIGHT-CONE EXPANSION N 5 17 0 1 

LIGHTHILL GAS MODEL N 10 57 0 1 

LIGHTHILL METHOD N 48 181 0 10 

LIGHTING EQUIPMENT N 186 72 41 303 

LIGHTNING N 1069 1438 69 557 

LIGHTNING SUPPRESSION N 62 113 8 53 

LIGNIN N 60 24 7 47 

LIGNITE N 62 23 2 34 

LIKELIHOOD RATIO N 90 76 0 5 

LIMB BRIGHTENING N 19 57 0 6 

LIMB DARKENING N 61 463 0 10 

LIMBS N 5 68 0 7 

Ll MBS (ANATOMY) N 77 139 11 27 

LIMEN N 2 1 0 0 

LIMESTONE N 183 98 23 134 

LIMITER AMPLIFIERS N 15 39 0 16 

LIMITER CIRCUITS N 107 261 3 123 

LIMITERS (FUSION REACTORS) N 93 19 1 18 

LIMITS N 11 48 0 12 

LIMITS (MATHEMATICS) N 366 585 56 122 

LIMNOLOGY N 87 212 34 104 

LIMONITE N 19 30 0 2 

LINCOLN EXPERIMENTAL SATELLITES N 28 45 1 49 

LINE CURRENT N 31 33 1 23 

LINE OF SIGHT N 231 623 5 300 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*****'** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LINE OF SIGHT COMMUNICATION N 84 131 3 67 

LINE SHAPE N 168 1365 3 65 

LINE SPECTRA N 3135 14401 108 1282 1

LINEAR ACCELERATORS N 1135 197 11 378 

LINEAR AMPLIFIERS N 37 185 10 47 

LINEAR ARRAYS N 350 1394 3 216 

LINEAR CIRCUITS N 119 424 66 117 

LINEAR ENERGY TRANSFER (LET) N 93 144 2 30 

LINEAR EQUATIONS N 2031 7924 511 774 1

LINEAR EVOLUTION EQUATIONS N 19 28 0 2 

LINEAR FILTERS N 323 1259 23 130 

LINEAR INTEGRATED CIRCUITS N 31 25 31 36 

LINEAR OPERATORS N 95 143 37 7 

LINEAR POLARIZATION N 103 1877 0 38 

LINEAR PREDICTION N 426 419 14 139 

LINEAR PROGRAMMING N 1304 806 256 594 

LINEAR QUADRATIC GAUSSIAN CONTROL N 63 247 0 6 

LINEAR QUADRATIC REGULATOR N 51 223 0 3 

LINEAR RECEIVERS N 23 51 1 6 

LINEAR SYSTEMS N 3279 8160 483 1429 1

LINEAR TRANSFORMATIONS N 296 460 75 115 

LINEAR VIBRATION N 78 225 15 32 

LINEARITY N 1351 587 90 650 

LINEARIZATION N 505 1958 13 104 

LINEN N 3 1 0 3 

LINES N 14 37 3 25 

LINES (GEOMETRY) N 125 131 22 40 

LINES OF FORCE N 196 2379 5 45 

LING-TEMCO-VOUGHT AIRCRAFT N 0 0 0 1 

LINGUISTICS N 267 67 98 190 

LINING PROCESSES N 16 10 1 46 

LININGS N 469 353 3 576 

LINKAGES N 231 115 12 141 

LINKS N 18 81 1 9 

LINKS (MATHEMATICS) N 23 16 5 6 

LIOUVILLE EQUATIONS N 69 297 6 19 

LIOUVILLE THEOREM N 33 121 5 12 

LIP READING N 2 0 0 0 

LIPID METABOLISM N 69 322 30 33 

LIPIDS N 191 257 98 174 

LIPOIC ACID N 3 3 5 0 

LI POP ROTE INS N 22 59 11 16 

LIPS (ANATOMY) N 1 1 1 1 

LIPSCHITZ CONDITION N 124 363 4 25 

LIQUEFACTION N 142 89 14 112 

LIQUEFIED GASES N 251 146 23 267 

LIQUEFIED NATURAL GAS N 147 54 13 79 

LIQUID AIR N 16 11 1 30 

LIQUID AIR CYCLE ENGINES N 6 8 0 16 

LIQUID ALLOYS N 42 73 4 29 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LIQUID AMMONIA N 60 51 2 40 

LIQUID ATOMIZATION N 71 195 1 22 

LIQUID BEARINGS N 30 86 5 25 

LIQUID BREATHING N 6 4 0 2 

LIQUID CHROMATOGRAPHY N 392 140 78 223 

LIQUID COOLED REACTORS N 87 20 1 24 

LIQUID COOLING N 401 560 4 320 

LIQUID CRYSTALS N 710 974 96 435 

LIQUID FILLED SHELLS N 201 876 6 74 

LIQUID FLOW N 408 1020 27 241 

LIQUID FLUORINE N 7 3 0 1 1 

LIQUID FUELS N 191 308 8 221 

LIQUID HELIUM N 754 938 44 359 

LIQUID HELIUM 2 N 53 61 2 6 

LIQUID HYDROGEN N 681 733 23 1178 

LIQUID INJECTION N 131 195 3 109 

LIQUID LASERS N 71 158 6 54 

LIQUID LEVELS N 44 35 2 63 

LIQUID LITHIUM N 56 60 0 17 

LIQUID METAL COOLED REACTORS N 283 73 6 145 

LIQUID METAL FAST BREEDER REACTORS N 125 40 11 121 

LIQUID METALS N 1195 1664 75 870 

LIQUID NEON N 13 15 0 7 

LIQUID NITROGEN N 495 868 7 403 

LIQUID OXIDIZERS N 37 36 0 180 

LIQUID OXYGEN N 475 491 8 907 

LIQUID PHASE EPITAXY N 183 511 3 128 

LIQUID PHASES N 806 1136 75 505 

LIQUID POTASSIUM N 69 43 1 36 

LIQUID PROPELLANT ROCKET ENGINES N 590 844 52 2042 

LIQUID ROCKET PROPELLANTS N 790 633 50 2165 

LIQUID SLOSHING N 250 589 9 171 

LIQUID SODIUM N 277 105 4 132 

LIQUID SURFACES N 213 346 12 98 

LIQUID WASTES N 68 15 3 45 

LIQUID-GAS MIXTURES N 168 315 9 83 

LIQUID-LIQUID INTERFACES N 191 292 17 73 

LIQUID-SOLID INTERFACES N 598 1557 29 279 

LIQUID-VAPOR EQUILIBRIUM N 152 171 37 78 

LIQUID-VAPOR INTERFACES N 380 873 13 151 

LIQUIDS N 1052 380 273 1030 

LIQUIDUS N 42 130 2 15 

LIRTS (TELESCOPE) N 5 5 0 0 

LISP (PROGRAMMING LANGUAGE) N 174 184 30 33 

LISSAJOUS FIGURES N 3 14 0 1 

LISTS N 188 36 88 199 

LITERATURE N 348 57 506 344 

LITHERGOL ROCKET ENGINES N 9 2 0 0 

LITHIASIS N 0 4 0 0 

LITHIUM N 1396 1278 24 784 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LITHIUM ALLOYS N 313 995 4 111 

LITHIUM ALUMINUM HYDRIDES N 14 5 0 15 

LITHIUM BORATES N 33 11 1 10 

LITHIUM CHLORIDES N 144 110 0 95 

LITHIUM COMPOUNDS N 610 557 4 340 

LITHIUM COOLED REACTOR EXPERIMENT N 23 24 0 50 

LITHIUM FLUORIDES N 393 272 2 166 

LITHIUM HYDRIDES N 110 102 0 81 

LITHIUM HYDROXIDES N 49 36 0 35 

LITHIUM IODATES N 13 64 0 7 

LITHIUM ISOTOPES N 165 150 0 33 

LITHIUM NIOBATES N 158 1111 1 90 

LITHIUM OXIDES N 80 85 0 29 

LITHIUM PERCHLORATES N 12 32 0 8 

LITHIUM SULFATES N 13 15 0 14 

LITHIUM SULFUR BATTERIES N 228 390 3 76 

LITHOGRAPHY N 233 251 45 235 

LITHOLOGY N 422 313 17 214 

LITHOSPHERE N 319 617 15 199 

LITHUANIA N 0 3 0 0 

LITTLE JOE 2 LAUNCH VEHICLE N 1 0 0 236 

LITTLE JOHN ROCKET VEHICLE N 37 0 0 42 

LITTORAL DRIFT N 13 11 1 19 

LITTORAL TRANSPORT N 12 5 2 8 

LIVER N 182 426 27 160 

LIVERMORE POOL TYPE REACTOR N 2 0 0 1 

LIVESTOCK N 51 15 9 27 

LIXISCOPES N 2 4 0 3 

LIZARDS N 1 3 4 1 

LLANOS ORIENTALES (COLOMBIA) N 2 0 0 1 

LOAD DISTRIBUTION (FORCES) N 591 4512 10 543 

LOAD TESTING MACHINES N 61 303 3 56 

LOAD TESTS N 900 2700 22 588 

LOADING N 31 76 5 33 

LOADING MOMENTS N 314 242 10 183 

LOADING OPERATIONS N 130 114 6 226 

LOADING RATE N 180 722 3 1 1 1 

LOADS (FORCES) N 6017 2122 216 3970 1

LOBES N 9 51 0 4 

LOCAL AREA NETWORKS N 189 142 7 53 

LOCAL GROUP (ASTRONOMY) N 9 325 0 3 

LOCAL SCIENTIFIC SURVEY MODULE N 0 0 0 7 

LOCATES SYSTEM N 13 4 0 17 

LOCI N 60 129 3 36 

LOCKHEED AIRCRAFT N 22 113 11 26 

LOCKHEED MODEL 18 AIRCRAFT N 0 0 0 

LOCKING N 81 86 2 75 

LOCKS N 1 5 1 3 

LOCKS (FASTENERS) N 49 7 3 72 

LOCOMOTION N 107 154 39 44 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LOCOMOTIVES N 38 53 17 37 

LOCUSTS N 19 19 0 0 

LOFAR N 0 0 0 4 

LOFTING N 7 12 2 6 

LOG PERIODIC ANTENNAS N 63 158 3 82 

LOG SPIRAL ANTENNAS N 3 50 0 5 

LOGARITHMIC RECEIVERS N 23 64 1 24 

LOGARITHMS N 361 420 115 153 

LOGGING (INDUSTRY) N 8 4 1 6 

LOGIC N 59 40 78 38 

LOGIC CIRCUITS N 1684 1980 263 1985 

LOGIC DESIGN N 994 921 199 531 

LOGIC PROGRAMMING N 179 89 14 30 

LOGICAL ELEMENTS N 225 637 24 141 

LOGISTICS N 641 265 38 1984 

LOGISTICS MANAGEMENT N 501 253 20 652 

LOGISTICS OVER THE SHORE (LOTS) CARRIER N 0 2 0 3 

LOKI ROCKET VEHICLE N 14 4 1 4 

LOMONOSOV CURRENT N 2 2 0 0 

LONG DURATION EXPOSURE FACILITY N 120 69 2 87 

LONG DURATION SPACE FLIGHT N 256 449 2 225 

LONG ISLAND (NY) N 27 12 6 20 

LONG RANGE WEATHER FORECASTING N 274 384 21 97 

LONG TERM EFFECTS N 1326 3264 37 513 

LONG WAVE RADIATION N 228 725 6 96 

LONGERONS N 42 58 0 11 

LONGEVITY N 4 7 6 3 

LONGITUDE N 205 484 8 119 

LONGITUDE MEASUREMENT N 62 74 0 32 

LONGITUDINAL CONTROL N 314 499 5 192 

LONGITUDINAL STABILITY N 518 561 12 534 

LONGITUDINAL WAVES N 223 1268 7 91 

LOOK ANGLES (ELECTRONICS) N 19 7 0 4 

LOOK ANGLES (TRACKING) N 29 60 0 10 

LOOP ANTENNAS N 177 337 6 138 

LOOPS N 476 260 24 324 

LORAC NAVIGATION SYSTEM N 1 0 0 2 

LORAN N 129 155 13 249 

LORAN C N 299 257 5 103 

LORAN 0 N 12 6 1 18 

LORENTZ CONTRACTION N 20 50 4 4 

LORENTZ FORCE N 226 630 7 65 

LORENTZ GAS N 34 116 1 16 

LORENTZ TRANSFORMATIONS N 306 499 26 90 

LOS ALAMOS MOLTEN PLUTONIUM REACTOR N 1 0 0 4 

LOS ALAMOS WATER BOILER REACTOR N 0 0 0 1 

LOSS OF COOLANT N 21 5 0 3 

LOSSES N 667 337 17 502 

LOSSLESS EQUIPMENT N 14 109 2 8 

LOSSLESS MATERIALS N 33 165 1 15 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******• SUBJECT TERM *•**"'** TYPE STAR IAA NLN OTHER 

LOSSY MEDIA N 63 201 0 14 

LOUDNESS N 71 78 6 41 

LOUDSPEAKERS N 34 57 9 39 

LOUISIANA N 198 44 16 195 

LOUNGES N 0 2 1 0 

LOUVERS N 52 50 1 17 

LOVE WAVES N 67 136 2 24 

LOW ALTITUDE N 507 502 6 813 

LOW ASPECT RATIO N 113 149 2 60 

LOW ASPECT RATIO WINGS N 87 233 0 85 

LOW CARBON STEELS N 64 79 0 16 

LOW CONCENTRATIONS N 32 13 1 10 

LOW CONDUCTIVITY N 9 4 0 6 

LOW COST N 981 1713 8 1275 

LOW CURRENTS N 32 40 0 18 

LOW DENSITY FLOW N 50 138 1 37 

LOW DENSITY MATERIALS N 110 247 5 1 11 

LOW DENSITY RESEARCH N 29 14 1 14 

LOW DENSITY WINO TUNNELS N 45 90 0 21 

LOW FREQUENCIES N 1108 2003 37 829 

LOW FREQUENCY BANDS N 34 52 0 25 

LOW FREQUENCY TRANSIONOSPHERIC SATELLITES N 2 2 0 0 

LOW GRAVITY MANUFACTURING N 199 357 11 159 

LOW LEVEL TURBULENCE N 82 132 0 36 

LOW MOLECULAR WEIGHTS N 24 23 0 16 

LOW NOISE N 237 1161 17 283 

LOW OBSERVABLE REENTRY VEHICLES N 0 1 0 32 

LOW PASS FILTERS N 395 975 10 341 

LOW PRESSURE N 598 897 15 415 

LOW RESISTANCE N 7 10 0 4 

LOW REYNOLDS NUMBER N 106 551 3 39 

LOW SPEED N 404 328 10 330 

LOW SPEED STABILITY N 95 64 2 68 

LOW SPEED WIND TUNNELS N 414 509 8 238 

LOW TEMPERATURE N 1958 1146 198 1396 

LOW TEMPERATURE BRAZING N 14 7 2 10 

LOW TEMPERATURE ENVIRONMENTS N 244 410 12 257 

LOW TEMPERATURE PHYSICS N 351 618 101 151 

LOW TEMPERATURE TESTS N 375 1344 20 387 

LOW THRUST N 83 152 1 59 

LOW THRUST PROPULSION N 141 333 3 86 

LOW TURBULENCE N 27 82 0 21 

LOW VACUUM N 12 8 0 2 

LOW VISIBILITY N 203 196 2 94 

LOW VOLTAGE N 104 145 4 117 

LOW VOLUME RAMJET ENGINES N 1 0 0 33 

LOW WEIGHT N 13 117 0 16 

LOW WING AIRCRAFT N 9 9 0 4 

LOWER ATMOSPHERE N 354 776 28 161 

LOWER BODY NEGATIVE PRESSURE N 72 114 0 13 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LOWER CALIFORNIA (MEXICO) N 16 15 3 11 

LOWER IONOSPHERE N 74 949 4 51 

LR-62-RM-2 ENGINE N 0 0 0 2 

LR-87-AJ-5 ENGINE N 0 0 0 2 

LR-91-AJ-5 ENGINE N 0 0 0 2 

LR-99 ENGINE N 0 0 0 1 

LSSM N 7 7 0 14 

LUBRICANT TESTS N 159 387 7 94 

LUBRICANTS N 908 504 147 874 

LUBRICATING OILS N 611 827 41 455 

LUBRICATION N 903 693 214 729 

LUBRICATION SYSTEMS N 147 240 14 131 

LUDOX (TRADEMARK) N 2 0 0 0 

LUGS N 81 57 0 56 

LUMBAR REGION N 31 26 3 5 

LUMENS N 6 15 0 5 

LUMINAIRES N 212 131 20 341 

LUMINANCE N 233 406 6 97 

LUMINESCENCE N 656 1153 97 469 

LUMINOSITY N 677 2494 14 223 

LUMINOUS INTENSITY N 880 5683 11 511 

LUMPED PARAMETER SYSTEMS N 19 198 0 5 

LUMPING N 40 38 2 1 1 

LUNAR ALBEDO N 8 60 1 5 

LUNAR ATMOSPHERE N 102 195 17 84 

LUNAR BASED EQUIPMENT N 0 0 0 0 

LUNAR BASES N 231 469 21 157 

LUNAR COMMUNICATION N 25 33 2 51 

LUNAR COMPOSITION N 240 1556 16 199 

LUNAR CONSTRUCTION EQUIPMENT N 0 0 0 0 

LUNAR CORE N 48 249 2 17 

LUNAR CRATERS N 283 1179 23 169 

LUNAR CRUST N 143 686 21 90 

LUNAR DUST N 60 243 5 97 

LUNAR ECHOES N 2 37 0 3 

LUNAR ECLIPSES N 18 108 13 20 

LUNAR EFFECTS N 52 190 2 21 

LUNAR ENVIRONMENT N 161 229 19 129 

LUNAR EQUATOR N 0 12 0 1 

LUNAR ESCAPE DEVICES N 5 7 0 7 

LUNAR EVOLUTION N 195 1403 16 101 

LUNAR EXCAVATION EQUIPMENT N 0 0 0 0 

LUNAR EXPLORATION N 339 674 178 523 

LUNAR EXPLORATION SYSTEM FOR APOLLO N 7 11 2 46 

LUNAR FAR SIDE N 32 157 9 18 

LUNAR FIGURE N 1 71 0 3 

LUNAR FLIGHT N 45 64 58 122 

LUNAR FLYING VEHICLES N 17 7 0 13 

LUNAR GEOLOGY N 452 1064 155 331 

LUNAR GRAVITATION N 116 363 11 62 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LUNAR GRAVITATIONAL EFFECTS N 58 178 2 29 

LUNAR GRAVITY SIMULATOR N 11 9 0 7 

LUNAR LANDING N 141 179 29 545 

LUNAR LANDING MODULES N 62 59 3 124 

LUNAR LANDING SITES N 193 430 6 195 

LUNAR LAUNCH N 14 26 4 61 

LUNAR LIMB N 20 183 8 15 

LUNAR LOGISTICS N 21 25 0 61 

LUNAR LUMINESCENCE N 36 102 1 12 

LUNAR MAGNETIC FIELDS N 79 412 5 43 

LUNAR MANTLE N 21 153 1 6 

LUNAR MAPS N 120 443 59 93 

LUNAR MARIA N 228 1095 10 77 

LUNAR MINING N 0 0 0 0 

LUNAR MOBILE LABORATORIES N 8 17 0 30 

LUNAR MODULE N 276 168 4 1682 

LUNAR MODULE ASCENT STAGE N 2 3 0 15 

LUNAR MODULE 5 N 2 0 0 7 

LUNAR MODULE 7 N 1 0 0 0 

LUNAR OBSERVATORIES N 40 77 0 26 

LUNAR OCCULTATION N 50 333 5 40 

LUNAR ORBIT AND LANDING SIMULATORS N 8 6 0 20 

LUNAR ORBITAL RENDEZVOUS N 24 8 0 123 

LUNAR ORBITER N 190 237 9 171 

LUNAR ORBITER 1 N 0 0 1 1 

LUNAR ORBITER 2 N 0 0 0 2 

LUNAR ORBITER 3 N 0 1 0 1 

LUNAR ORBITER 4 N 0 4 0 0 

LUNAR ORBITER 5 N 0 3 0 3 

LUNAR ORBITS N 206 383 13 394 

LUNAR PHASES N 29 56 7 19 

LUNAR PHOTOGRAPHS N 113 237 34 41 

LUNAR PHOTOGRAPHY N 274 326 36 183 

LUNAR PROBES N 79 152 28 87 

LUNAR PROGRAMS N 32 60 9 73 

LUNAR RADAR ECHOES N 18 78 1 17 

LUNAR RADIATION N 30 178 3 17 

LUNAR RANGEFINDING N 50 165 2 50 

LUNAR RAYS N 5 27 0 2 

LUNAR RECEIVING LABORATORY N 16 18 2 13 

LUNAR RESOURCES N 0 22 0 5 

LUNAR RETROREFLECTORS N 16 46 1 7 

LUNAR ROCKS N 428 2808 56 424 

LUNAR ROTATION N 12 124 1 4 

LUNAR ROVING VEHICLES N 118 85 7 188 

LUNAR SATELLITES N 39 90 2 18 

LUNAR SEISMOGRAPHS N 46 160 2 24 

LUNAR SHADOW N 22 50 1 11 

LUNAR SHELTERS N 21 17 0 46 

LUNAR SOIL N 560 2175 32 428 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**'***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

LUNAR SPACECRAFT N 51 49 9 89 

LUNAR SURFACE N 341 1237 86 344 

LUNAR SURFACE VEHICLES N 71 44 8 80 

LUNAR TEMPERATURE N 54 289 7 45 

LUNAR TIDES N 67 393 2 32 

LUNAR TOPOGRAPHY N 681 1228 58 658 

LUNAR TRAJECTORIES N 39 52 5 115 

LUNG MORPHOLOGY N 30 183 3 16 

LUNGS N 223 426 54 179 

LUNIK LUNAR PROBES N 57 395 9 7 

LUNIK 10 LUNAR PROBE N 8 17 0 2 

LUNIK 11 LUNAR PROBE N 3 3 0 0 

LUNIK 12 LUNAR PROBE N 3 7 0 0 

LUNIK 13 LUNAR PROBE N 3 9 1 0 

LUNIK 14 LUNAR PROBE N 0 6 0 0 

LUNIK 16 LUNAR PROBE N 69 138 2 2 

LUNIK 17 LUNAR PROBE N 8 3 0 0 

LUNIK 19 LUNAR PROBE N 0 4 0 0 

LUNIK 2 LUNAR PROBE N 0 1 0 2 

LUNIK 20 LUNAR PROBE N 1 85 1 1 

LUNIK 22 LUNAR PROBE N 0 8 0 0 

LUNIK 3 LUNAR PROBE N 2 2 2 2 

LUNIK 9 LUNAR PROBE N 8 9 0 4 

LUNOKHOD LUNAR ROVING VEHICLES N 63 94 8 8 

LUSTER N 3 0 0 4 

LUTETIUM N 35 20 1 17 

LUTETIUM COMPOUNDS N 17 13 0 6 

LUTETIUM ISOTOPES N 21 11 0 4 

LUXEMBOURG N 3 1 3 10 

LUXEMBOURG EFFECT N 4 8 0 2 

LUXEMBOURG SPACE PROGRAM N 0 1 0 7 

LYMAN ALPHA RADIATION N 310 1602 1 91 

LYMAN BETA RADIATION N 15 113 0 2 

LYMAN SPECTRA N 99 486 1 45 

LYMPH N 25 76 9 37 

LYMPHOCYTES N 122 184 12 147 

LYRA CONSTELLATION N 48 135 5 17 

LYSERGAMIDE N 0 0 1 0 

LYSERGINE N 1 0 0 3 

LYSIMETERS N 7 2 0 2 

LYSINE N 10 33 0 5 

LYSOGENESIS N 7 15 2 1 

LYSOSOMES N 9 27 12 2 

LYSOZYME N 15 49 4 8 

LZEEBE SATELLITE N 1 2 0 0 

M REGION N 7 19 0 5 

M STARS N 59 1035 3 11 

M-1 ENGINE N 9 1 0 9 

M- 100 ENGINE N 1 0 0 1 

M-2 LIFTING BODY N 4 5 0 7 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM **""  TYPE STAR IAA NLN OTHER 

M-2F2 LIFTING BODY N 9 3 0 5 

M-2F3 LIFTING BODY N 3 1 0 1 

M-46 ENGINE N 0 0 0 2 

M-55 ENGINE N 1 0 0 41 

M-56 ENGINE N 0 0 0 22 

M-57 ENGINE N 0 0 0 30 

MA-2 ENGINE N 0 0 0 1 

MA-3 ENGINE N 0 0 0 10 

MA-5 ENGINE N 0 0 0 13 

MACE MISSILES N 0 1 0 1 

MACH CONES N 33 151 0 15 

MACH INERTIA PRINCIPLE N 8 100 4 1 

MACH NUMBER N 2501 7003 26 2082 1

MACH REFLECTION N 23 189 0 16 

MACH-ZEHNDER INTERFEROMETERS N 109 696 0 29 

MACHINE LEARNING N 355 403 39 163 

MACHINE ORIENTED LANGUAGES N 448 164 97 368 

MACHINE TOOLS N 677 513 220 949 

MACHINE TRANSLATION N 186 69 24 143 

MACHINE-INDEPENDENT PROGRAMS N 55 6 4 33 

MACHINERY N 200 201 220 171 

MACHINING N 629 640 142 803 

MACLAURIN SERIES N 12 112 2 7 

MACROMOLECULES N 3 2 0 0 

MACROPHAGES N 12 22 2 9 

MACROSCOPIC EQUATIONS N 58 230 11 21 

MAFFEI GALAXIES N 1 4 0 1 

MAGAZINES (SUPPLY CHAMBERS) N 21 4 0 26 

MAGDALENA-CAUCA VALLEY (COLOMBIA) N 1 0 0 0 

MAGELLAN PROJECT (NASA) N 13 46 0 5 

MAGELLAN SPACECRAFT (NASA) N 9 29 0 8 

MAGELLAN ULTRAVIOLET ASTRONOMY SATELLITE N 1 11 0 0 

MAGELLANIC CLOUDS N 186 2026 16 63 

MAGIC TEES N 3 12 0 5 

MAGMA N 322 720 15 145 

MAGNESIUM N 850 1523 36 555 

MAGNESIUM ALLOYS N 483 2149 33 346 

MAGNESIUM BROMIDES N 3 1 0 3 

MAGNESIUM CELLS N 24 8 0 29 

MAGNESIUM CHLORIDES N 39 62 0 20 

MAGNESIUM COMPOUNDS N 219 255 2 154 

MAGNESIUM FLUORIDES N 81 124 0 47 

MAGNESIUM GERMANATES N 1 1 0 0 

MAGNESIUM GERMANIDES N 0 2 0 1 

MAGNESIUM ISOTOPES N 58 118 0 10 

MAGNESIUM OXIDES N 432 666 6 270 

MAGNESIUM PERCHLORATES N 6 4 0 6 

MAGNESIUM SULFATES N 25 17 1 10 

MAGNESIUM TITANATES N 2 5 0 3 

MAGNET COILS N 364 289 6 176 
NASA COMBINED FILE POSTING STATISTICS 

910117 

** ***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MAGNETIC AMPLIFIERS N 35 42 15 36 

MAGNETIC ANNULAR ARC N 11 13 3 12 

MAGNETIC ANNULAR SHOCK TUBES N 3 10 1 1 

MAGNETIC ANOMALIES N 673 826 15 447 

MAGNETIC BEARINGS N 47 125 0 29 

MAGNETIC CHARGE DENSITY N 54 53 1 25 

MAGNETIC CIRCUITS N 110 255 20 122 

MAGNETIC CLOUDS N 23 84 0 5 

MAGNETIC COILS N 481 499 9 201 

MAGNETIC COMPASSES N 14 26 5 24 

MAGNETIC COMPRESSION N 61 36 0 32 

MAGNETIC CONTROL N 108 721 4 72 

MAGNETIC COOLING N 37 32 0 23 

MAGNETIC CORES N 255 178 14 219 

MAGNETIC DIFFUSION N 58 168 4 31 

MAGNETIC DIPOLES N 417 1664 12 159 

MAGNETIC DISKS N 191 85 12 145 

MAGNETIC DISPERSION N 84 82 3 32 

MAGNETIC DISTURBANCES N 469 1813 7 207 

MAGNETIC DOMAINS N 153 226 13 119 

MAGNETIC DRUMS N 16 10 4 24 

MAGNETIC EFFECTS N 465 5767 20 217 

MAGNETIC ENERGY STORAGE N 24 31 0 4 

MAGNETIC EQUATOR N 124 760 2 34 

MAGNETIC FIELD CONFIGURATIONS N 934 5769 12 190 

MAGNETIC FIELD INVERSIONS N 31 136 0 11 

MAGNETIC FIELD RECONNECTION N 99 542 0 15 

MAGNETIC FIELDS N 9048 12444 378 4792 2

MAGNETIC FILMS N 115 241 6 83 

MAGNETIC FLUX N 1029 4279 20 353 

MAGNETIC FORMING N 17 27 2 14 

MAGNETIC INDUCTION N 425 1035 19 195 

MAGNETIC LENSES N 98 96 8 65 

MAGNETIC LEVITATION VEHICLES N 37 281 12 26 

MAGNETIC MATERIALS N 439 435 136 319 

MAGNETIC MEASUREMENT N 744 1607 33 417 

MAGNETIC MIRRORS N 512 797 5 116 

MAGNETIC MOMENTS N 584 671 15 226 

MAGNETIC MONOPOLES N 63 227 4 25 

MAGNETIC PERMEABILITY N 505 788 12 235 

MAGNETIC PISTONS N 19 35 0 7 

MAGNETIC POLES N 135 371 4 54 

MAGNETIC PROBES N 105 180 1 47 

MAGNETIC PROPERTIES N 1640 1166 320 997 

MAGNETIC PUMPING N 82 177 1 22 

MAGNETIC RECORDING N 284 396 45 329 

MAGNETIC RELAXATION N 46 55 7 12 

MAGNETIC RESONANCE N 235 292 76 176 

MAGNETIC RIGIDITY N 52 352 0 8 

MAGNETIC SHIELDING N 121 156 4 73 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MAGNETIC SIGNALS N 42 24 3 40 

MAGNETIC SIGNATURES N 260 886 1 233 

MAGNETIC SPECTROSCOPY N 128 191 22 78 

MAGNETIC STARS N 57 1168 7 13 

MAGNETIC STORAGE N 194 254 32 146 

MAGNETIC STORMS N 1188 4133 28 424 

MAGNETIC SURVEYS N 439 216 5 580 

MAGNETIC SUSPENSION N 285 406 10 153 

MAGNETIC SWITCHING N 47 55 0 31 

MAGNETIC TAPE TRANSPORTS N 22 6 0 9 

MAGNETIC TAPES N 905 378 38 931 

MAGNETIC TRANSDUCERS N 38 114 1 30 

MAGNETIC VARIATIONS N 378 1999 8 157 

MAGNETICALLY TRAPPED PARTICLES N 192 887 6 37 

MAGNETITE N 86 143 6 41 

MAGNETIZATION N 559 992 51 274 

MAGNETO-OPTICS N 204 536 18 138 

MAGNETOACOUSTIC WAVES N 67 782 1 25 

MAGNETOACOUSTICS N 36 96 4 31 

MAGNETOACTI VITY N 29 348 8 16 

MAGNETOCARDIOGRAPHY N 8 33 0 4 

MAGNETOELASTIC WAVES N 59 133 9 26 

MAGNETOELECTRIC MEDIA N 19 61 5 10 

MAGNETOHYDROOYNAMIC FLOW N 894 5928 43 291 

MAGNETOHYOROOYNAMIC GENERATORS N 856 1986 59 761 

MAGNETOHYORODYNAMIC SHEAR HEATING N 14 71 0 3 

MAGNETOHYDRODYNAMIC STABILITY N 2551 10599 60 575 1

MAGNETOHYDRODYNAMIC TURBULENCE N 101 719 1 43 

MAGNETOHYDRODYNAMIC WAVES N 742 3769 24 205 

MAGNETOHYDRODYNAMICS N 1537 2517 201 852 

MAGNETOHYDROSTATICS N 14 100 1 11 

MAGNETOIONICS N 37 460 8 20 

MAGNETOMECHANICS (PHYSICS) N 10 50 5 3 

MAGNETOMETERS N 1148 1501 18 975 

MAGNETOPAUSE N 292 1283 2 83 

MAGNETOPLASMAOYNAMICS N 102 519 4 33 

MAGNETORESISTIVITY N 221 313 11 103 

MAGNETOSHEATH N 157 662 0 25 

MAGNETOSONIC RESONANCE N 42 171 0 10 

MAGNETOSPHERE-IONOSPHERE COUPLING N 93 313 0 27 

MAGNETOSPHERES N 33 107 0 20 

MAGNETOSPHERIC ELECTRON DENSITY N 135 759 5 28 

MAGNETOSPHERIC INSTABILITY N 202 1984 9 47 

MAGNETOSPHERIC ION DENSITY N 78 455 1 24 

MAGNETOSPHERIC PROTON DENSITY N 46 223 2 10 

MAGNETOSTATIC AMPLIFIERS N 4 35 1 10 

MAGNETOSTATIC FIELDS N 55 301 2 23 

MAGNETOSTA TICS N 128 370 13 63 

MAGNETOSTRICTION N 193 302 8 148 

MAGNETOTAILS N 0 1 0 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MAGNETRON SPUTTERING N 49 239 1 25 

MAGNETRONS N 131 457 8 222 

MAGNETS N 526 243 48 475 

MAGNI F !CATION N 97 127 3 82 

MAGNITUDE N 264 660 4 227 

MAGNONS N 185 165 15 66 

MAGNUS EFFECT N 107 169 1 89 

MAGSAT A SATELLITE N 12 2 0 6 

MAGSAT B SATELLITE N 0 0 0 1 

MAGSAT SATELLITES N 143 175 0 26 

MAGSAT 1 SATELLITE N 85 0 0 1 

MAIN SEQUENCE STARS N 164 2438 7 48 

MAINE N 137 21 15 81 

MAINTAINABILITY N 618 923 75 1524 

MAINTENANCE N 2823 1342 538 4339 

MAINTENANCE TRAINING N 20 21 3 80 

MAJORITY CARRIERS N 23 171 0 8 

MALAGASY REPUBLIC N 12 10 0 1 

MALAWI N 2 3 1 0 

MALAYSIA N 16 21 5 5 

MALDIVE ISLANDS N 1 1 0 0 

MALEATES N 16 4 0 5 

MALES N 291 322 31 114 

MALFUNCTIONS N 309 241 5 624 

MALI N 20 46 2 3 

MALKUS THEORY N 1 8 0 0 

MALLEABILITY N 8 9 1 5 

MALONONITRILE N 4 5 0 2 

MALTA N 4 3 1 18 

MAMMALS N 181 272 114 243 

MAMMARY GLANDS N 3 2 3 8 

MAN ENVIRONMENT INTERACTIONS N 304 1048 136 165 

MAN MACHINE SYSTEMS N 4002 4063 403 2418 1

MAN OPERATED PROPULSION SYSTEMS N 16 28 0 12 

MAN POWERED AIRCRAFT N 5 41 5 3 

MAN TENDED FREE FLYERS N 53 116 0 12 

MAN-COMPUTER INTERFACE N 518 475 5 141 

MANAGEMENT N 486 82 1107 921 

MANAGEMENT ANALYSIS N 246 99 140 225 

MANAGEMENT INFORMATION SYSTEMS N 983 122 298 1021 

MANAGEMENT METHODS N 1310 457 1538 984 

MANAGEMENT PLANNING N 3926 1431 788 4431 1

MANAGEMENT SYSTEMS N 357 217 208 455 

MANATEES N 4 1 0 0 

MANDELSTAM REPRESENTATION N 45 64 1 5 

MANDRELS N 70 81 0 126 

MANEUVERABILITY N 473 410 13 872 

MANEUVERABLE REENTRY BODIES N 24 23 0 271 

MANEUVERABLE SPACECRAFT N 34 76 4 84 

MANEUVERS N 238 119 5 463 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM  ..,**  TYPE STAR IAA NLN OTHER 

MANGANESE N 543 419 25 348 

MANGANESE ALLOYS N 289 827 8 110 

MANGANESE COMPOUNDS N 187 159 2 99 

MANGANESE IONS N 14 30 0 2 

MANGANESE ISOTOPES N 40 94 0 16 

MANGANESE OXIDES N 106 75 3 44 

MANGANESE PHOSPHIDES N 0 1 0 0 

MANGANIN (TRADEMARK) N 20 25 0 17 

MANIFOLDS N 134 143 12 166 

MANIFOLDS (MATHEMATICS) N 366 559 107 145 

MANIPULATORS N 1359 1547 70 599 

MANITOBA N 7 33 2 3 

MANITOU (CO) N 5 0 0 0 

MANN-WHITNEY-WILCOXON U TEST N 3 12 1 1 

MANNED LUNAR SURFACE VEHICLES N 4 5 1 29 

MANNED MANEUVERING UNITS N 35 69 0 17 

MANNED MARS MISSIONS N 90 279 0 27 

MANNED ORBITAL LABORATORIES N 160 231 12 464 

MANNED ORBITAL TELESCOPES N 27 19 0 54 

MANNED REENTRY N 25 31 3 71 

MANNED SPACE FLIGHT N 1736 1410 342 1237 

MANNED SPACE FLIGHT NETWORK N 30 9 1 115 

MANNED SPACECRAFT N 469 526 46 1026 

MANNING THEORY N 9 1 0 1 

MANNITOL N 3 2 0 6 

MANOMETERS N 93 163 9 85 

MANPOWER N 345 77 430 726 

MANUAL N 20 0 46 24 

MANUAL CONTROL N 715 770 24 436 

MANUALS N 1358 58 2011 2227 

MANUFACTURING N 3185 1297 702 5093 

MANURES N 8 0 2 19 

MANY BODY PROBLEM N 522 1198 115 138 

MANY ELECTRON EFFECTS N 8 5 0 4 

MAP (PROGRAMMING LANGUAGE) N 7 2 1 45 

MAP MATCHING GUIDANCE N 31 92 1 58 

MAPPING N 4594 1601 358 2750 

MAPS N 1393 315 617 1069 

MAPSAT N 1 9 0 0 

MARAGING N 2 18 0 3 

MARAGING STEELS N 157 547 9 141 

MARANGONI CONVECTION N 81 331 1 64 

MARECS MARITIME SATELLITES N 13 36 0 2 

MARGINS N 15 19 5 10 

MARIA N 11 20 2 11 

MARIJUANA N 9 14 7 2 

MARINE BIOLOGY N 667 236 390 838 

MARINE CHEMISTRY N 63 146 19 55 

MARINE ENVIRONMENTS N 1014 743 184 911 

MARINE MAMMALS N 1 1 3 6 20 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MARINE METEOROLOGY N 714 1320 59 333 

MARINE PROPULSION N 165 121 19 301 

MARINE RESOURCES N 173 81 119 183 

MARINE RUDDERS N 10 4 1 23 

MARINE TECHNOLOGY N 501 256 180 619 

MARINE TRANSPORTATION N 80 81 22 102 

MARINER C SPACECRAFT N 2 0 1 8 

MARINER JUPITER-SATURN FLYBY N 20 25 0 13 

MARINER JUPITER-URANUS FLYBY N 0 1 0 2 

MARINER MARK 2 SPACECRAFT N 3 29 0 15 

MARINER PROGRAM N 82 66 25 84 

MARINER R 2 SPACE PROBE N 1 1 0 1 

MARINER SPACE PROBES N 151 203 7 123 

MARINER SPACECRAFT N 114 133 6 97 

MARINER VENUS 67 SPACECRAFT N 7 0 1 7 

MARINER VENUS-MERCURY 1973 N 37 97 0 9 

MARINER 1 SPACE PROBE N 0 1 0 1 

MARINER 10 SPACE PROBE N 35 139 1 83 

MARINER 11 SPACE PROBE N 0 0 0 

MARINER 2 SPACE PROBE N 5 42 1 34 

MARINER 3 SPACE PROBE N 2 5 0 6 

MARINER 4 SPACE PROBE N 51 95 3 69 

MARINER 5 SPACE PROBE N 62 135 0 55 

MARINER 6 SPACE PROBE N 43 74 2 64 

MARINER 7 SPACE PROBE N 44 78 2 64 

MARINER 8 SPACE PROBE N 1 0 0 1 

MARINER 9 SPACE PROBE N 164 325 4 110 

MARINER-MERCURY 1973 N 4 3 0 1 

MARISAT SATELLITES N 15 46 1 2 

MAR I SAT 1 SATELLITE N 1 4 0 0 

MARITIME SATELLITES N 69 492 13 27 

MARK 1 REENTRY BODY N 0 0 0 10 

MARK 1 SPACECRAFT N 2 1 0 0 

MARK 11 REENTRY BODY N 0 0 0 85 

MARK 12 REENTRY BODY N 3 0 0 106 

MARK 17 REENTRY BODY N 1 0 0 2 

MARK 2 REENTRY BODY N 3 0 0 47 

MARK 3 REENTRY BODY N 1 2 0 13 

MARK 4 REENTRY BODY N 2 0 0 21 

MARK 5 REENTRY BODY N 0 0 0 3 

MARK 6 REENTRY BODY N 0 0 0 47 

MARKARIAN GALAXIES N 13 172 0 4 

MARKERS N 45 25 4 112 

MARKET RESEARCH N BOO 699 111 502 

MARKETING N 865 464 346 945 

MARKING N 181 70 16 118 

MARKOV CHAINS N 469 538 52 158 

MARKOV PROCESSES N 1146 1783 102 357 

MAROTS (ESA) N 27 65 1 1 

MARQUARDT R4D ENGINE N 0 0 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MARS N 21 1 0 93 

MARS (MANNED REUSABLE SPACECRAFT) N 11 8 0 11 

MARS (PLANET) N 866 1168 160 1122 

MARS ATMOSPHERE N 544 1868 27 316 

MARS CRATERS N 69 145 0 22 

MARS ENVIRONMENT N 107 233 18 111 

MARS EXCURSION MODULE N 33 23 1 33 

MARS LANDING N 118 227 5 54 

MARS OBSERVER N 32 86 0 38 

MARS PHOTOGRAPHS N 33 223 6 90 

MARS PROBES N 280 519 27 341 

MARS SAMPLE RETURN MISSIONS N 85 136 0 44 

MARS SATELLITES N 1 28 0 5 

MARS SURFACE N 775 1817 34 602 

MARS SURFACE SAMPLES N 105 166 0 46 

MARS VOLCANOES N 73 116 0 30 

MARS 1 SPACECRAFT N 1 2 0 2 

MARS 2 SPACECRAFT N 12 46 0 2 

MARS 3 SPACECRAFT N 26 79 0 4 

MARS 4 SPACECRAFT N 1 13 0 2 

MARS 5 SPACECRAFT N 16 77 0 2 

MARS 6 SPACECRAFT N 4 30 1 1 

MARS 69 PROJECT N 33 13 1 15 

MARS 7 SPACECRAFT N 1 2 0 1 

MARS 71 PROJECT N 69 29 0 18 

MARSHLANDS N 177 160 44 154 

MARTENSITE N 368 749 14 125 

MARTENSITIC STAINLESS STEELS N 144 428 7 49 

MARTENSITIC TRANSFORMATION N 90 627 7 36 

MARTIN AIRCRAFT N 1 0 0 8 

MARTINGALES N 79 14 9 5 

MARTINIQUE N 1 2 0 0 

MARVS (PROGRAMMING LANGUAGE) N 0 0 0 1 

MARYLAND N 226 38 91 206 

MASCONS N 24 152 0 18 

MASER MATERIALS N 0 1 0 0 

MASER OUTPUTS N 27 399 0 15 

MASER PUMPING N 2 8 0 1 

MASERS N 329 764 83 299 

MASKING N 190 265 9 158 

MASKS N 121 89 5 176 

MASONITE (TRADEMARK) N 1 0 0 1 

MASONRY N 34 6 40 29 

MASS N 584 533 44 415 

MASS BALANCE N 40 211 2 27 

MASS DISTRIBUTION N 772 3960 20 348 

MASS DRIVERS N 18 77 1 25 

MASS FLOW N 663 1160 10 348 

MASS FLOW FACTORS N 70 116 0 30 

MASS FLOW RATE N 313 1336 1 143 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MASS RATIOS N 176 1106 0 91 

MASS SPECTRA N 519 400 49 233 

MASS SPECTROMETERS N 1206 1061 49 834 

MASS SPECTROSCOPY N 1770 2542 228 1088 

MASS TO LIGHT RATIOS N 18 786 0 3 

MASS TRANSFER N 2035 4339 229 926 

MASSACHUSETTS N 172 50 32 172 

MASSAGING N 3 5 1 1 

MASSIFS N 18 23 0 12 

MASSIVELY PARALLEL PROCESSORS N 139 123 0 32 

MASTICATION N 8 6 0 9 

MASTOIDS N 2 4 0 0 

MATCHED FILTERS N 191 851 1 100 

MATCHING N 298 298 3 158 

MATERIAL ABSORPTION N 150 112 5 132 

MATERIAL BALANCE N 54 36 8 39 

MATERIALS N 231 56 340 606 

MATERIALS HANDLING N 1360 424 278 1650 

MATERIALS RECOVERY N 792 483 141 677 

MATERIALS SCIENCE N 533 1816 357 867 

MATERIALS TESTS N 1564 3004 237 1546 

MATHEMATICAL LOGIC N 867 158 512 424 

MATHEMATICAL MODELS N 40829 32655 2459 21419 9

MATHEMATICAL PROGRAMMING N 497 486 121 182 

MATHEMATICAL TABLES N 54 142 219 42 

MATHEMATICS N 115 61 891 139 

MATHIEU FUNCTION N 61 311 10 21 

MATRA MISSILE N 0 3 0 3 

MATRICES N 42 85 21 32 

MATRICES (CIRCUITS) N 146 502 14 95 

MATRICES (MATHEMATICS) N 6723 12643 617 2923 2

MATRIX MANAGEMENT N 1 1 18 4 2 

MATRIX MATERIALS N 497 588 4 548 

MATRIX METHODS N 758 2394 112 263 

MATRIX THEORY N 331 1128 67 121 

MATTER (PHYSICS) N 206 564 205 78 

MATTER-ANTIMATTER PROPULSION N 17 47 0 3 

MATTS (SYSTEMS) N 7 10 0 4 

MAULER MISSILE N 0 1 0 2 

MAURITANIA N 6 8 1 4 

MAURITIUS N 0 6 19 0 

MAVERICK MISSILES N 4 1 0 119 

MAXIMA N 144 431 40 36 

MAXIMUM ENTROPY METHOD N 136 328 5 25 

MAXIMUM LIKELIHOOD ESTIMATES N 1563 2388 19 318 

MAXIMUM PRINCIPLE N 143 750 19 45 

MAXIMUM USABLE FREQUENCY N 154 86 1 51 

MAXWELL BODIES N 10 66 0 5 

MAXWELL EQUATION N 855 3233 53 276 

MAXWELL FLUIDS N 37 140 1 9 
NASA COMBINED FILE POSTING STATISTICS 

910117 

".****** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MAXWELL-BOLTZMANN DENSITY FUNCTION N 210 1136 8 77 

MAXWELL-MOHR METHOD N 0 5 0 0 

MAYER PROBLEM N 12 21 3 7 

MAYPOLE ANTENNAS N 11 0 0 4 

MAZE LEARNING N 7 9 0 10 

MBM JUNCTIONS N 3 9 0 1 

MCDONNELL AIRCRAFT N 0 15 0 9 

MCDONNELL DOUGLAS AIRCRAFT N 10 63 3 102 

MCLEOD GAGES N 4 5 0 5 

MCMURDO SOUND N 2 2 0 4 

MEAN N 571 269 10 293 

MEAN FREE PATH N 190 820 2 59 

MEAN SQUARE VALUES N 97 350 0 44 

MEANDERS N 27 59 1 12 

MEASURE AND INTEGRATION N 569 599 162 242 

MEASUREMENT N 541 130 214 465 

MEASURES N 7 2 11 10 

MEASURING INSTRUMENTS N 3308 2741 529 3073 

MECAMYLAMINE N 0 1 0 0 

MECHANICAL DEVICES N 753 651 125 575 

MECHANICAL DRIVES N 1022 651 59 730 

MECHANICAL ENGINEERING N 817 755 834 628 

MECHANICAL IMPEDANCE N 134 245 6 65 

MECHANICAL MEASUREMENT N 169 455 35 104 

MECHANICAL OSCILLATORS N 86 565 17 36 

MECHANICAL PROPERTIES N 10260 14936 1316 9806 3

MECHANICAL SHOCK N 380 125 60 298 

MECHANICAL TWINNING N 39 139 1 13 

MECHANICS (PHYSICS) N 68 282 369 69 

MECHANISM N 22 18 22 32 

MECHANIZATION N 134 72 52 212 

MECHANOGRAMS N 4 13 0 2 

MECHANORECEPTOR$ N 5 56 6 5 

MECLIZINE N 0 1 0 0 

MEDIA N 119 33 30 134 

MEDIAN (STATISTICS) N 55 66 6 36 

MEDIASTINUM N 0 3 2 0 

MEDIATION N 2 8 42 7 

MEDICAL ELECTRONICS N 134 432 110 98 

MEDICAL EQUIPMENT N 525 265 132 454 

MEDICAL PERSONNEL N 84 60 94 116 

MEDICAL PHENOMENA N 34 41 7 10 

MEDICAL SCIENCE N 757 156 1089 879 

MEDICAL SERVICES N 210 260 217 349 

MEDICINE N 39 34 257 171 

MEDITERRANEAN SEA N 252 207 21 219 

MEDIUM SCALE INTEGRATION N 17 44 4 21 

MEGALOPOLISES N 19 7 6 7 

MEGAMECHANICS N 2 11 0 0 

MELAMINE N 13 1 1 13 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MELANIN N 9 8 2 3 

MELANOIDIN N 0 5 0 1 

MELLIN TRANSFORMS N 30 143 4 7 

MELT SPINNING N 50 248 0 30 

MELTING N 1179 1056 51 766 

MELTING POINTS N 557 707 13 379 

MELTS (CRYSTAL GROWTH) N 345 812 14 422 

MEMBRANE STRUCTURES N 366 1120 48 192 

MEMBRANES N 785 679 289 662 

MEMORY N 422 473 103 184 

MEMORY (COMPUTERS) N 515 881 9 241 

MENDELEVIUM N 3 0 0 3 

MENDELEVIUM ISOTOPES N 0 0 0 0 

MENINGITIS N 2 6 0 11 

MENISCI N 57 122 0 23 

MENSTRUATION N 9 28 1 7 

MENTAL HEALTH N 57 73 144 61 

MENTAL PERFORMANCE N 710 838 77 340 

MENTHOL N 1 1 0 2 

MEPROBAMATE N 1 0 1 1 

MERCATOR PROJECTION N 50 40 2 45 

MERCURE AIRCRAFT N 8 8 0 0 

MERCURY (METAL) N 795 567 41 550 

MERCURY (PLANET) N 214 791 29 161 

MERCURY ALLOYS N 34 22 1 66 

MERCURY AMALGAMS N 44 16 1 23 

MERCURY ARCS N 33 74 1 21 

MERCURY ATMOSPHERE N 1 25 0 4 

MERCURY CADMIUM TELLURIDES N 175 586 2 261 

MERCURY COMPOUNDS N 157 182 11 170 

MERCURY FLIGHTS N 13 21 6 18 

MERCURY ION ENGINES N 49 145 0 16 

MERCURY ISOTOPES N 25 17 0 9 

MERCURY LAMPS N 32 58 1 55 

MERCURY MA-1 FLIGHT N 0 1 0 1 

MERCURY MA-2 FLIGHT N 0 0 1 5 

MERCURY MA-3 FLIGHT N 0 0 0 1 

MERCURY MA-4 FLIGHT N 0 0 0 6 

MERCURY MA-5 FLIGHT N 0 0 0 7 

MERCURY MA-6 FLIGHT N 0 1 0 8 

MERCURY MA-7 FLIGHT N 0 0 0 5 

MERCURY MA-8 FLIGHT N 1 0 0 8 

MERCURY MA-9 FLIGHT N 1 0 0 11 

MERCURY MR-1 FLIGHT N 0 0 0 8 

MERCURY MR-2 FLIGHT N 0 0 0 8 

MERCURY MR-3 FLIGHT N 0 0 1 13 

MERCURY MR-4 FLIGHT N 0 0 0 5 

MERCURY OXIDES N 12 8 0 10 

MERCURY PROJECT N 28 38 30 115 

MERCURY SPACECRAFT N 7 17 5 61 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *****"'* TYPE STAR IAA NLN OTHER 

MERCURY SURFACE N 4 34 0 23 

MERCURY TELLURIDES N 80 209 3 92 

MERCURY VAPOR N 113 332 1 65 

MERGING ROUTINES N 29 12 1 24 

MERIDIONAL FLOW N 214 1202 2 41 

MEROMORPHIC FUNCTIONS N 65 26 7 47 

MERRITT ISLAND (FL) N 13 3 1 0 

MERWINITE N 0 1 0 0 

MESAS N 9 25 1 6 

MESH N 229 357 2 103 

MESITYLENE N 4 1 0 0 

MESOMETEOROLOGY N 138 919 13 40 

MESON RESONANCE N 155 7 1 26 

MESON-MESON INTERACTIONS N 13 5 0 6 

MESON-NUCLEON INTERACTIONS N 173 18 2 31 

MESONS N 737 338 47 239 

MESOPAUSE N 61 290 0 19 

MESOPHILE$ N 6 15 0 8 

MESOSCALE PHENOMENA N 795 892 2 266 

MESOSPHERE N 524 1691 25 246 

MESOZOIC ERA N 1 2 0 1 

MESSAGE PROCESSING N 434 176 13 273 

MESSAGES N 209 93 22 132 

METABOLIC DISEASES N 5 7 32 10 

METABOLIC WASTES N 102 131 10 72 

METABOLISM N 1014 998 496 895 

METABOLITES N 37 26 4 80 

METAL AIR BATTERIES N 122 61 2 53 

METAL BONDING N 468 991 50 350 

METAL COATINGS N 793 1538 71 770 

METAL COMBUSTION N 78 637 4 96 

METAL COMPOUNDS N 162 198 33 84 

METAL CRYSTALS N 544 4065 65 238 

METAL CUTTING N 232 340 75 256 

METAL DRAWING N 77 104 11 88 

METAL FATIGUE N 1369 6870 160 624 

METAL FIBERS N 75 748 8 80 

METAL FILMS N 848 1845 48 764 

METAL FINISHING N 80 82 50 67 

METAL FLUORIDES N 28 59 1 18 

METAL FOAMS N 16 18 0 18 

METAL FOILS N 340 772 6 217 

METAL FUELS N 38 46 1 93 

METAL GRINDING N 49 79 3 27 

METAL HALIDES N 104 122 7 57 

METAL HYDRIDES N 252 623 20 121 

METAL IONS N 472 1796 22 259 

METAL JOINTS N 227 583 4 160 

METAL MATRIX COMPOSITES N 882 3701 49 1031 

METAL NITRIDES N 7 22 0 5 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

METAL OXIDE SEMICONDUCTORS N 1210 2677 119 1097 

METAL OXIDES N 532 1477 40 357 

METAL PARTICLES N 197 817 10 180 

METAL PLATES N 991 1857 21 765 

METAL POLISHING N 46 92 7 38 

METAL POWDER N 618 1656 54 558 

METAL PROPELLANTS N 74 129 1 156 

METAL SHEETS N 505 1896 49 500 

METAL SHELLS N 91 403 5 79 

METAL SPINNING N 42 31 2 53 

METAL SPRAYING N 29 98 9 32 

METAL STRIPS N 86 328 4 75 

METAL SURFACES N 1399 5169 97 634 

METAL VAPOR LASERS N 64 760 1 58 

METAL VAPORS N 340 989 21 189 

METAL WORKING N 1030 1573 357 1149 

METAL-GAS SYSTEMS N 51 637 6 31 

METAL-METAL BONDING N 339 650 17 213 

METAL-NITRIDE-OXIDE-SEMICONDUCTORS N 9 24 0 11 

METAL-NITRIDE-OXIDE-SILICON N 42 88 1 25 

METAL-WATER REACTIONS N 50 165 10 23 

METALLIC GLASSES N 184 270 14 87 

METALLIC HYDROGEN N 29 92 1 33 

METALLIC PLASMAS N 71 849 5 48 

METALLIC STARS N 33 688 0 9 

METALLICITY N 46 1467 1 8 

METALLIZING N 389 537 24 321 

METALLOGRAPHY N 1239 2675 273 921 

METALLOIDS N 66 101 38 44 

METALLOSILOXANE POLYMER N 1 1 0 0 

METALLOXANE POLYMER N 0 0 1 2 

METALLURGY N 780 1010 493 1017 

METALS N 2786 1691 1498 2682 

METAMORPHIC ROCKS N 80 62 0 12 

METAMORPHISM (GEOLOGY) N 229 468 41 140 

METASTABLE ATOMS N 90 332 2 50 

METASTABLE STATE N 549 1327 21 255 

METATHESIS N 10 3 0 9 

METEOR TRAILS N 157 952 9 75 

METEOR 1 ROCKET VEHICLE N 3 3 0 0 

METEORITE COLLISIONS N 122 427 1 50 

METEORITE CRATERS N 145 731 20 85 

METEORITES N 417 546 135 489 

METEORITIC COMPOSITION N 274 3696 20 263 

METEORITIC DAMAGE N 114 433 6 94 

METEORITIC DIAMONDS N 5 30 1 1 

METEORITIC MICROSTRUCTURES N 55 508 3 32 

METEOROID CONCENTRATION N 63 286 2 50 

METEOROID OUST CLOUDS N 31 112 2 22 

METEOROID HAZARDS N 75 80 5 84 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

METEOROID PROTECTION N 85 102 4 146 

METEOROID SHOWERS N 112 671 6 64 

METEOROIDS N 305 663 70 271 

METEOROLOGICAL BALLOONS N 321 215 10 229 

METEOROLOGICAL CHARTS N 1469 1679 43 1034 

METEOROLOGICAL FLIGHT N 328 701 3 168 

METEOROLOGICAL INSTRUMENTS N 780 838 69 478 

METEOROLOGICAL PARAMETERS N 5822 4655 166 3282 1

METEOROLOGICAL RADAR N 1179 2466 41 449 

METEOROLOGICAL RESEARCH AIRCRAFT N 36 151 1 18 

METEOROLOGICAL SATELLITES N 1621 1811 170 968 

METEOROLOGICAL SERVICES N 731 739 46 294 

METEOROLOGICAL SOLENOIDS N 8 5 0 0 

METEOROLOGY N 2387 1076 875 2017 

METEOSAT SATELLITE N 266 454 7 28 

METHAMPHETAMINE N 2 2 0 0 

METHANATION N 73 7 2 51 

METHANE N 1814 3099 48 1120 

METHIONINE N 8 21 0 5 

METHOD OF CHARACTERISTICS N 312 788 10 100 

METHOD OF MOMENTS N 172 479 2 30 

METHODOLOGY N 935 826 414 591 

METHOXY SYSTEMS N 17 28 0 19 

METHYL ALCOHOL N 464 568 6 264 

METHYL CHLORIDE N 26 37 2 20 

METHYL CHLOROSILANES N 5 8 0 3 

METHYL COMPOUNDS N 493 661 8 371 

METHYL NITRATE N 9 10 0 4 

METHYL POLYSILOXANE N 11 6 0 4 

METHYLATION N 19 12 5 22 

METHYLENE N 87 80 3 73 

METHYLENE BLUE N 10 16 0 7 

METHYLENE DIAMINE N 2 5 0 1 

METHYLHYDRAZINE N 56 51 0 69 

METRAZOL N 1 0 0 0 

METRIC PHOTOGRAPHY N 83 35 0 8 

METRIC SPACE N 205 772 54 51 

METRICATION N 64 15 26 29 

METROLOGY N 413 576 126 225 

MEXICAN SPACE PROGRAM N 1 1 0 0 

MEXICO N 159 143 120 113 

MH-262 AIRCRAFT N 1 1 0 0 

MICA N 78 110 24 135 

MICARTA N 1 0 0 3 

MICE N 436 626 25 448 

MICHAEL REACTION N 2 4 0 1 

MICHAELIS THEORY N 1 1 0 0 

MICHELL THEOREM N 6 14 0 0 

MICHELSON INTERFEROMETERS N 227 935 8 115 

MICHIGAN N 253 81 23 181 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MICROANALYSIS N 412 647 96 229 

MICROBALANCES N 89 80 14 35 

MICROBALLOONS N 25 51 0 23 

MICROBEAMS N 15 24 6 7 

MICROBIOLOGY N 505 361 362 599 

MICROBURSTS (METEOROLOGY) N 118 188 1 8 

MICROCHANNEL PLATES N 91 212 2 94 

MICROCHANNELS N 52 117 0 150 

MICROCLIMATOLOGY N 120 102 14 72 

MICROCOMPUTERS N 1635 1126 566 862 

MICROCRACKS N 373 1628 6 141 

MICROCRYSTALS N 55 148 8 23 

MICROCYST IS N 3 1 0 4 

MICRODENSITOMETERS N 170 332 2 46 

MICROELECTRONICS N 1654 1575 430 2719 

MICROFIBERS N 15 53 0 6 

MICROFILMS N 276 48 114 264 

MICROGRAVITY APPLICATIONS N 1251 1964 60 1856 

MICROHARDNESS N 305 1374 3 153 

MICROINSTRUMENTATION N 27 105 6 22 

MICROMECHANICS N 135 502 2 46 

MICROMETEORITES N 54 45 1 20 

MICROMETEOROID EXPLORER SATELLITES N 2 2 0 6 

MICROMETEOROIDS N 241 548 9 144 

MICROMETEOROLOGY N 213 316 21 105 

MICROMETERS N 65 142 5 105 

MICROMILLIAMMETERS N 1 2 0 2 

MICROMINIATURIZATION N 226 194 31 418 

MICROMINIATURIZED ELECTRONIC DEVICES N 97 109 42 193 

MICROMODULES N 34 30 5 27 

MICROMOTORS N 4 26 0 5 

MICROORGANISMS N 862 526 222 854 

MICROPARTICLES N 104 345 4 58 

MICROPHONES N 396 354 13 251 

MICROPHOTOGRAPHS N 67 248 43 52 

MICROPLASMAS N 6 74 1 5 

MICROPOLAR FLUIDS N 7 104 0 7 

MICROPOROSITY N 90 155 0 42 

MICROPROCESSORS N 2375 2336 476 1462 

MICROPROGRAMMING N 258 259 100 136 

MICROPULSATIONS N 48 79 0 24 

MICROROCKET ENGINES N 21 99 1 18 

MICROSCOPES N 136 117 75 138 

MICROSCOPY N 516 359 138 373 

MICROSEISMS N 49 25 1 51 

MICROSONICS N 7 14 4 4 

MICROSPORES N 17 15 1 3 

MICROSTRIP ANTENNAS N 149 633 0 36 

MICROSTRIP DEVICES N 170 536 0 38 

MICROSTRIP TRANSMISSION LINES N 157 911 5 67 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MICROSTRUCTURE N 6591 16909 245 3265 2

MICROTHRUST N 37 78 2 29 

MICROTOMY N 7 7 4 4 

MICROTRONS N 40 18 0 23 

MICROVISION LANDING AID N 0 3 0 0 

MICROWAVE AMPLIFIERS N 450 1994 30 867 

MICROWAVE ANTENNAS N 383 2286 38 224 

MICROWAVE ATTENUATION N 253 1450 9 111 

MICROWAVE CIRCUITS N 284 2616 92 328 

MICROWAVE COUPLING N 108 954 7 62 

MICROWAVE EMISSION N 257 1856 6 106 

MICROWAVE EQUIPMENT N 1290 2250 186 1706 

MICROWAVE FILTERS N 78 745 14 62 

MICROWAVE FREQUENCIES N 653 997 34 469 

MICROWAVE HOLOGRAPHY N 22 182 7 21 

MICROWAVE IMAGERY N 179 426 5 123 

MICROWAVE INTERFEROMETERS N 114 355 3 50 

MICROWAVE LANDING SYSTEMS N 295 382 8 155 

MICROWAVE OSCILLATORS N 314 3061 25 345 

MICROWAVE PHOTOGRAPHY N 7 29 2 9 

MICROWAVE PLASMA PROBES N 68 288 4 15 

MICROWAVE POWER BEAMING N 14 15 0 0 

MICROWAVE PROBES N 41 147 1 24 

MICROWAVE RADIOMETERS N 874 1707 14 426 

MICROWAVE REFLECTOMETERS N 26 70 0 16 

MICROWAVE RESONANCE N 99 821 12 48 

MICROWAVE SCANNING BEAM LANDING SYSTEM N 18 16 0 2 

MICROWAVE SCATTERING N 296 865 7 112 

MICROWAVE SENSORS N 282 602 28 191 

MICROWAVE SIGNATURES N 31 55 0 8 

MICROWAVE SOUNDING N 55 194 0 43 

MICROWAVE SPECTRA N 253 1261 48 171 

MICROWAVE SPECTROMETERS N 66 151 5 29 

MICROWAVE SWITCHING N 69 325 4 85 

MICROWAVE TRANSMISSION N 760 3406 61 397 

MICROWAVE TUBES N 161 262 31 241 

MICROWAVES N 1884 1499 313 1378 

MICROYIELD STRENGTH N 5 16 0 4 

MIDAIR COLLISIONS N 156 150 6 28 

MIDALTITUDE N 0 4 0 0 

MIDAS SATELLITES N 8 6 0 6 

MIDAS 2 SATELLITE N 1 1 0 4 

MIDAS 3 SATELLITE N 2 1 0 0 

MIDAS 4 SATELLITE N 2 6 0 2 

MIDAS 5 SATELLITE N 5 0 0 0 

MIDAS 6 SATELLITE N 1 0 0 0 

MIDAS 7 SATELLITE N 0 2 0 0 

MIDCOURSE GUIDANCE N 67 92 1 290 

MIDCOURSE TRAJECTORIES N 19 26 0 52 

MIDDLE ATMOSPHERE N 274 562 8 120 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MIDDLE EAR N 27 53 2 12 

MIDDLE EAR PRESSURE N 1 14 0 1 

MIOLATITUDE ATMOSPHERE N 94 2455 5 24 

MIE SCATTERING N 369 848 2 133 

MIG AIRCRAFT N 6 39 0 23 

MIGRATION N 280 139 39 187 

MIL AIRCRAFT N 1 9 0 0 

MILIARIA N 0 0 0 0 

MILITARY AIR FACILITIES N 490 57 14 541 

MILITARY AIRCRAFT N 841 2486 287 1857 

MILITARY AVIATION N 156 400 50 128 

MILITARY COMPACT REACTORS N 1 0 0 27 

MILITARY HELICOPTERS N 437 898 15 746 

MILITARY OPERATIONS N 1489 420 167 4466 

MILITARY PSYCHOLOGY N 147 91 10 65 

MILITARY SPACECRAFT N 168 570 35 719 

MILITARY TECHNOLOGY N 2017 2890 427 7346 1

MILITARY VEHICLES N 98 45 8 294 

MILK N 37 12 5 30 

MILKY WAY GALAXY N 242 5030 60 57 

MILLET N 3 6 0 0 

MILLIMETER WAVES N 1388 5211 78 1535 

MI LUNG N 12 24 1 17 

MILLING (MACHINING) N 158 138 24 128 

MILLING MACHINES N 74 35 6 84 

MI LLIVOL TMETERS N 1 3 0 4 

MILLS RATIO N 3 2 0 0 

MILNE METHOD N 15 63 0 7 

MILNE-THOMSON METHOD N 1 4 0 0 

MIM (SEMICONDUCTORS) N 18 92 0 5 

MIM DIODES N 4 15 0 1 

MIMAS N 7 58 0 2 

MIMD (COMPUTERS) N 57 152 0 10 

MIMO (CONTROL SYSTEMS) N 0 0 0 0 

MINE DETECTORS N 13 6 3 57 

MINERAL DEPOSITS N 713 293 293 591 

MINERAL EXPLORATION N 574 532 63 521 

MINERAL METABOLISM N 89 155 26 29 

MINERAL OILS N 127 134 2 57 

MINERALOGY N 453 1846 219 419 

MINERALS N 1108 694 358 766 

MINES N 9 7 9 17 

MINES (EXCAVATIONS) N 610 118 151 539 

MINES (ORDNANCE) N 34 7 3 310 

MINIATURE ELECTRONIC EQUIPMENT N 248 358 52 483 

MINIATURIZATION N 256 396 14 349 

MINICOMPUTERS N 1275 1262 222 735 

MINIMA N 140 415 43 85 

MINIMAL SURFACES N 8 1 2 0 

MINIMAX TECHNIQUE N 375 696 22 115 
NASA COMBINED FILE POSTING STATISTICS 

910117 

....... -"'*'~< SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MINIMUM DRAG N 22 123 1 15 

MINIMUM ENTROPY METHOD N 9 14 1 1 

MINIMUM VARIANCE ORBIT DETERMINATION N 40 22 0 8 

MINING N 565 140 217 625 

MINITRACK SYSTEM N 37 8 0 22 

MINKOWSKI SPACE N 108 350 6 43 

MINNESOTA N 258 54 12 167 

MINOR CIRCLE TURNING FLIGHT N 0 6 0 0 

MINORITIES N 46 2 406 84 

MINORITY CARRIERS N 207 1013 1 49 

MINOS COMPUTER N 1 0 0 0 

MINUTEMAN ICBM N 129 78 3 1803 

MIOSIS N 4 3 1 0 

MIR SPACE STATION N 36 87 0 110 

MIRA VARIABLES N 27 421 0 10 

MIRAGE AIRCRAFT N 53 60 0 14 

MIRAGE 3 AIRCRAFT N 26 24 0 16 

MIRANDA N 26 75 0 4 

MIRANDA SATELLITE N 2 4 0 0 

MIROS SYSTEM N 0 1 0 3 

MIRROR FUSION N 211 25 0 46 

MIRROR POINT N 10 20 0 8 

MIRRORS N 1632 4552 58 1589 

MIS (SEMICONDUCTORS) N 181 802 10 86 

MISALIGNMENT N 133 305 0 70 

MISCIBILITY GAP N 48 62 0 8 

MISMATCH (ELECTRICAL) N 12 75 0 5 

MISS DISTANCE N 67 130 0 503 

MISSILE ANTENNAS N 32 51 0 176 

MISSILE BODIES N 82 111 2 112 

MISSILE COMPONENTS N 226 135 7 2918 

MISSILE CONFIGURATIONS N 234 341 4 737 

MISSILE CONTROL N 578 1410 49 2043 

MISSILE DEFENSE N 53 125 6 370 

MISSILE DESIGN N 237 587 36 705 

MISSILE DETECTION N 29 52 0 577 

MISSILE LAUNCHERS N 105 150 4 1051 

MISSILE RANGES N 300 92 4 535 

MISSILE SIGNATURES N 18 10 1 259 

MISSILE SILOS N 28 25 0 202 

MISSILE SIMULATORS N 7 62 0 34 

MISSILE STORAGE N 7 17 0 94 

MISSILE STRUCTURES N 55 170 9 184 

MISSILE SYSTEMS N 110 154 13 563 

MISSILE TESTS N 77 251 7 723 

MISSILE TRACKING N 117 210 3 928 

MISSILE TRAJECTORIES N 345 246 5 1730 

MISSILE VIBRATION N 28 72 3 32 

MISSILES N 514 183 169 2389 

MISSING MASS (ASTROPHYSICS) N 40 282 0 1 
910117 

NASA 

******* SUBJECT TERM ******* 

MISSION ADAPTIVE WINGS 

MISSION PLANNING 

MISSISSIPPI 

MISSISSIPPI 

MISSIONS 

DELTA (LA) 

MISSISSIPPI RIVER (US) 

MISSOURI 

MISSOURI 

RIVER (US) 

MISSOURI RIVER BASIN (US) 

MIXED 

MITRA 

MITOSIS 

MITOCHONDRIA 

MIST 

CRYSTALS 

MIXED OXIDES 

MIXING 

MIXING 

MIXERS 

CIRCUITS 

MIXING HEIGHT 

MIXING LAYERS (FLUIDS) 

MIXING LENGTH FLOW THEORY 

ML-1 

MIXTURES 

NUCLEAR POWER PLANT 

MOBILE 

MNEMONICS 

COMMUNICATION SYSTEMS 

MOBILE LOUNGES 

MOBILE MISSILE LAUNCHERS 

MOBILE QUARANTINE FACILITY 

MODAL 

MOBILITY 

RESPONSE 

MODCOMP II COMPUTER 

MODCOMP IV COMPUTER 

MODE 

MODE 

(STATISTICS) 

MODE TRANSFORMERS 

MODEL REFERENCE ADAPTIVE CONTROL 

MODERATION 

MODEMS 

MODELS 

(ENERGY ABSORPTION) 

MODES 

MODES 

MODERATORS 

(STANDING WAVES) 

MODFETS 

COMBINED 

MODULAR INTEGRATED UTILITY SYSTEM 

MODULAR RATIOS 

MODULATED 

MODULARITY 

CONTINUOUS RADIATION 

MODULATION 

MODULATION 

DOPING 

MODULATION TRANSFER FUNCTION 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

STAR 

10 

3423 

29 

167 

39 

42 

233 

12 

8 

94 

66 

52 

0 

91 

17 

78 

201 

901 

18 

795 

252 

321 

0 

38 

174 

3 

7 

3 

636 

319 

5 

3 

18 

44 

37 

4546 

239 

22 

157 

148 

15 

19 

14 

56 

255 

16 

695 

3 

174 

STATISTICS 

27 

IAA 

4061 

52 

25 

16 

30 

15 

3 

2 

56 

134 

250 

2 

49 

2130 

902 

545 

211 

51 

196 

837 

873 

0 

16 

393 

9 

22 

0 

158 

2960 

4 

0 

0 

29 

547 

479 

246 

236 

12 

14 

99 

58 

76 

37 

10 

240 

43 

1205 

96 

605 

NLN 

0 

99 

2 

36 

4 

20 

6 

2 

1 

14 

37 

4 

0 

0 

1 

30 

6 

0 

0 

9 

42 

0 

10 

16 

0 

0 

0 

25 

0 

1 

2 

0 

0 

0 

7 

255 

0 

3 

2 

0 

0 

1 

4 

3 

0 

7 

90 

3 

0 

OTHER 

38 

5222 

176 

148 

41 

27 

156 

6 

51 

61 

36 

13 

0 

86 

15 

24 

172 

627 

2 

58 

36 

629 

2 

72 

22 

5 

65 

1 

176 

388 

9 

0 

0 

17 

16 

2 

4711 

287 

3 

18 

95 

65 

8 

32 

22 

15 

6 

590 

1 

62 

1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MODULATORS N 397 844 29 477 

MODULES N 739 662 23 1091 

MODULUS OF ELASTICITY N 1556 5241 28 973 

MOIRE EFFECTS N 117 485 13 52 

MOIRE FRINGES N 33 219 0 7 

MOIRE INTERFEROMETRY N 66 249 0 16 

MOISTURE N 531 228 14 560 

MOISTURE CONTENT N 1418 1675 26 780 

MOISTURE METERS N 90 38 12 64 

MOISTURE RESISTANCE N 51 124 2 19 

MOJAVE DESERT (CA) N 25 27 2 7 

MOLD N 6 6 2 8 

MOLDAVITE N 5 19 1 3 

MOLDING MATERIALS N 233 327 49 273 

MOLDS N 226 215 52 231 

MOLECULAR ABSORPTION N 195 981 5 118 

MOLECULAR BEAM EPITAXY N 319 1330 8 164 

MOLECULAR BEAMS N 706 863 50 325 

MOLECULAR BIOLOGY N 161 585 310 176 

MOLECULAR CHAINS N 302 294 31 142 

MOLECULAR CLOUDS N 409 3874 2 110 

MOLECULAR COLLISIONS N 549 2053 51 282 

MOLECULAR DIFFUSION N 272 591 18 116 

MOLECULAR ELECTRONICS N 47 65 24 63 

MOLECULAR ENERGY LEVELS N 817 1625 31 302 

MOLECULAR EXCITATION N 664 2887 38 334 

MOLECULAR FLOW N 155 479 7 88 

MOLECULAR GASES N 290 2347 19 120 

MOLECULAR INTERACTIONS N 880 1316 112 415 

MOLECULAR IONS N 274 1637 12 116 

MOLECULAR ORBITALS N 418 388 116 167 

MOLECULAR OSCILLATIONS N 287 1594 11 106 

MOLECULAR OSCILLATORS N 43 205 9 25 

MOLECULAR PHYSICS N 59 370 42 58 

MOLECULAR PUMPS N 24 43 2 11 

MOLECULAR RELAXATION N 723 2237 55 272 

MOLECULAR ROTATION N 432 2777 34 151 

MOLECULAR SHIELDS N 4 2 0 1 

MOLECULAR SPECTRA N 384 3485 180 186 

MOLECULAR SPECTROSCOPY N 486 921 92 222 

MOLECULAR STRUCTURE N 2411 1127 606 1291 

MOLECULAR THEORY N 100 204 125 43 

MOLECULAR TRAJECTORIES N 32 78 3 11 

MOLECULAR WEIGHT N 743 454 41 505 

MOLECULES N 979 67 395 968 

MOLES N 0 2 0 1 

MOLLIER DIAGRAM N 15 18 3 13 

MOLLUSKS N 40 24 42 41 

MOLNIYA SATELLITES N 37 142 0 14 

MOLTEN SALT ELECTROLYTES N 227 237 14 103 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MOLTEN SALT NUCLEAR REACTORS N 79 1 1 0 22 

MOLTEN SALTS N 320 149 17 148 

MOLTING N 5 2 0 2 

MOLYBDATES N 37 38 2 22 

MOLYBDENUM N 1201 1743 36 720 

MOLYBDENUM ALLOYS N 644 2461 17 422 

MOLYBDENUM CARBIDES N 20 107 0 5 

MOLYBDENUM COMPOUNDS N 165 163 2 97 

MOLYBDENUM DISULFIDE$ N 125 242 2 49 

MOLYBDENUM ISOTOPES N 2 4 0 0 

MOLYBDENUM OXIDES N 52 80 0 37 

MOLYBDENUM SULFIDES N 70 90 1 24 

MOM (SEMICONDUCTORS) N 14 58 0 8 

MOMENT DISTRIBUTION N 211 463 18 142 

MOMENTS N 363 310 27 257 

MOMENTS OF INERTIA N 355 1388 34 283 

MOMENTUM N 752 486 36 353 

MOMENTUM THEORY N 159 760 13 68 

MOMENTUM TRANSFER N 1100 2220 28 322 

MONACO N 0 2 1 0 

MONATOMIC GASES N 170 668 3 85 

MONATOMIC MOLECULES N 29 52 0 9 

MONAURAL SIGNALS N 16 25 0 4 

MONAZITE SANDS N 4 3 0 7 

MONEL (TRADEMARK) N 34 19 1 25 

MONGE-AMPERE EQUATION N 4 26 1 0 

MONGOLIA N 11 34 4 4 

MONITORS N 1552 1036 56 1317 

MONKEYS N 368 536 24 349 

MONOCHROMATIC RADIATION N 258 1746 10 144 

MONOCHROMATIZATION N 29 42 0 21 

MONOCHROMATORS N 326 402 9 154 

MONOCOQUE STRUCTURES N 15 54 3 18 

MONOCULAR VISION N 26 195 0 13 

MONOETHANOLAMINE (MEA) N 2 2 0 4 

MONO IDS N 14 0 1 5 

MONOMERS N 446 247 38 393 

MONOMOLECULAR FILMS N 59 85 5 25 

MONOPLANES N 19 34 19 14 

MONOPOLE ANTENNAS N 132 325 1 80 

MONOPOLES N 74 168 2 31 

MONOPROPELLANTS N 153 197 0 444 

MONOPULSE ANTENNAS N 45 174 2 44 

MONDPULSE RADAR N 124 286 7 218 

MONOSACCHARIDES N 10 15 2 10 

MONOSCOPES N 2 15 0 1 

MONOSTABLE MULTIVIBRATORS N 9 26 1 21 

MONOTECTIC ALLOYS N 24 41 0 32 

MONOTONE FUNCTIONS N 201 406 6 40 

MONOTONY N 11 30 0 6 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MONSOONS N 330 440 37 88 

MONTANA N 252 63 58 226 

MONTE CARLO METHOD N 3555 4782 77 1540 

MONTEREY BAY (CA) N 25 7 0 6 

MONTH N 56 27 1 27 

MONTICELLITE N 0 1 0 1 

MONTMORILLONITE N 23 65 0 12 

MOODS N 19 38 4 5 

MOON N 479 556 419 837 

MOON ILLUSION N 2 9 0 0 

MOON-EARTH TRAJECTORIES N 11 48 5 32 

MOONLETS N 0 2 0 0 

MOONQUAKES N 12 100 1 4 

MOORING N 112 49 6 168 

MORALE N 32 5 56 43 

MOREHOUSE COMET N 0 12 0 1 

MORNING N 10 115 0 5 

MOROCCO N 22 28 3 10 

MORPHINE N 12 27 2 6 

MORPHOLOGICAL INDEXES N 22 21 2 6 

MORPHOLOGY N 1468 2353 148 794 

MORSE CODE N 14 6 0 20 

MORSE POTENTIAL N 41 56 0 12 

MORTALITY N 157 168 37 103 

MORTARS (MATERIAL) N 36 6 8 39 

MOSAICS N 190 235 6 271 

MOSCOW N 8 28 1 15 

MOSSBAUER EFFECT N 554 415 95 238 

MOTHS N 21 19 6 4 

MOTION N 224 157 68 175 

MOTION AFTEREFFECTS N 26 69 1 10 

MOTION PERCEPTION N 188 528 21 65 

MOTION PICTURES N 231 328 79 153 

MOTION SICKNESS N 422 466 12 211 

MOTION SICKNESS DRUGS N 44 89 0 22 

MOTION SIMULATION N 110 127 0 87 

MOTION SIMULATORS N 183 180 4 78 

MOTION STABILITY N 272 1982 31 190 

MOTIVATION N 259 137 307 190 

MOTOR VEHICLES N 399 111 49 352 

MOTORS N 131 57 56 323 

MOUNTAIN INHABITANTS N 7 116 1 6 

MOUNTAINS N 907 688 88 399 

MOUNTING N 242 284 2 198 

MOUTH N 21 19 10 42 

MOVING TARGET INDICATORS N 331 819 10 874 

MOZAMBIQUE N 5 1 2 0 

MRCA AIRCRAFT N 83 137 0 9 

MRKOS COMET N 3 25 0 5 

MSAT N 22 35 0 13 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

MSM (SEMICONDUCTORS) N 4 26 0 1 

MTBF N 95 851 0 57 

MUCOCELES N 0 1 0 1 

MUCUS N 15 29 2 19 

MUD N 50 21 4 30 

MUFFLERS N 66 37 3 44 

MULBERRY (ALLOY) N 3 0 0 0 

MULLITES N 61 97 0 29 

MULTI-ANODE MICROCHANNEL ARRAYS N 5 12 0 6 

MULTIBEAM ANTENNAS N 53 320 0 40 

MULTICHANNEL COMMUNICATION N 319 1714 18 299 

MULTIENGINE VEHICLES N 14 39 4 13 

MULTIGRID METHODS N 16 123 0 1 

MULTILAYER INSULATION N 189 168 1 246 

MULTIMISSION MODULAR SPACECRAFT N 44 75 2 21 

MULTIMODE RESONATORS N 43 519 1 20 

MULTIPACTOR DISCHARGES N 15 13 0 15 

MULTIPATH TRANSMISSION N 649 811 7 404 

MULTIPHASE FLOW N 259 443 31 102 

MULTIPHOTON ABSORPTION N 47 529 5 27 

MULTIPLE ACCESS N 202 434 5 108 

MULTIPLE BEAM INTERVAL SCANNERS N 91 43 3 28 

MULTIPLE DOCKING ADAPTERS N 16 13 0 16 

MULTIPLE OUTPUT PROGRAMS N 73 10 3 42 

MULTIPLEXING N 944 1246 54 1083 

MULTIPLICATION N 180 311 24 77 

MULTIPLIERS N 200 380 23 126 

MULTIPOLAR FIELDS N 52 196 4 16 

MULTIPDLES N 156 339 2 71 

MULTIPROCESSING (COMPUTERS) N 1301 1144 38 505 

MULTIPROGRAMMING N 291 106 21 147 

MULTISENSOR APPLICATIONS N 47 230 0 80 

MULTISPECTRAL BAND CAMERAS N 164 52 1 30 

MULTISPECTRAL BAND SCANNERS N 2442 2661 20 553 

MULTISPECTRAL LINEAR ARRAYS N 46 51 0 27 

MULTISPECTRAL PHOTOGRAPHY N 1400 1102 27 267 

MULTISPECTRAL RADAR N 18 47 2 28 

MULTISPECTRAL RESOURCE SAMPLER N 8 6 0 9 

MULTISPECTRAL TRACKING TELESCOPES N 6 9 0 6 

MULTISTAGE ROCKET VEHICLES N 138 329 5 230 

MULTISTATIC RADAR N 93 187 0 126 

MULTIVARIATE STATISTICAL ANALYSIS N 1281 458 117 419 

MUL TIVIBRATORS N 45 105 24 122 

MUON SPIN ROTATION N 32 10 2 6 

MUDNIUM N 13 6 2 9 

MUONS N 713 1368 16 157 

MURCHISON METEORITE N 8 50 0 2 

MURRAY METEORITE N 1 34 0 1 

MUSCLE RELAXANTS N 7 6 0 2 

MUSCLES N 382 453 139 323 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *•***** TYPE STAR IAA NLN OTHER 

MUSCOVITE N 17 14 2 6 

MUSCULAR FATIGUE N 71 180 1 39 

MUSCULAR FUNCTION N 306 1268 37 121 

MUSCULAR STRENGTH N 115 174 3 58 

MUSCULAR TONUS N 61 214 3 29 

MUSCULOSKELETAL SYSTEM N 399 544 59 193 

MUSEUMS N 17 15 46 11 

MUSHY ZONES N 3 29 0 3 

MUSIC N 29 17 48 17 

MUSKEGS N 0 2 0 2 

MUTAGENS N 67 17 6 90 

MUTATIONS N 218 229 39 136 

MX MISSILE N 25 40 1 132 

MYELIN N 6 18 5 5 

MYLAR (TRADEMARK) N 160 145 0 171 

MYOCARDIAL INFARCTION N 60 309 12 14 

MYOCARDIUM N 125 1031 23 57 

MYOELECTRIC POTENTIALS N 30 70 2 8 

MYOELECTRICITY N 12 52 6 10 

MYOGLOBIN N 6 16 1 4 

MYOPIA N 18 26 2 3 

MYSTERE 20 AIRCRAFT N 1 3 0 1 

MYSTERE 50 AIRCRAFT N 1 1 0 0 

N ELECTRONS N 8 7 0 4 

N-N JUNCTIONS N 9 43 0 3 

N-P-N JUNCTIONS N 47 293 0 176 

N-TYPE SEMICONDUCTORS N 421 2331 5 213 

NACELLES N 526 467 4 412 

NAKED SINGULARITIES N 2 18 1 3 

NAMIBIA N 5 5 1 4 

NAMING N 30 6 15 8 

NAP-OF-THE-EARTH NAVIGATION N 80 123 0 87 

NAPHTHALENE N 177 115 2 103 

NAPHTHENES N 32 16 1 20 

NARCOLEPSY N 1 6 1 1 

NARCOSIS N 45 31 1 26 

NARCOTICS N 16 22 17 16 

NARROWBAND N 143 413 0 127 

NASA INTERACTIVE PLANNING SYSTEM N 1 0 0 3 

NASA PROGRAMS N 2769 3767 1046 2703 1

NASA SPACE PROGRAMS N 166 1024 16 433 

NASCOM NETWORK N 19 5 0 19 

NASTRAN N 595 288 45 167 

NATIONAL AEROSPACE PLANE PROGRAM N 35 79 0 41 

NATIONAL AIRSPACE SYSTEM N 163 107 3 28 

NATIONAL AIRSPACE UTILIZATION SYSTEM N 69 72 0 14 

NATIONAL AVIATION SYSTEM N 59 66 5 20 

NATIONAL LAUNCH VEHICLE PROGRAM N 4 1 0 4 

NATIONAL OCEANIC SATELLITE SYSTEM N 13 2 1 6 

NATIONAL PARKS N 18 25 9 16 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

NATIONAL SEVERE STORMS PROJECT N 32 39 1 5 

NATIONS N 71 30 110 77 

NATO 3B SATELLITE N 0 2 0 2 

NATURAL GAS N 1107 441 165 844 

NATURAL GAS EXPLORATION N 74 31 2 62 

NATURAL LANGUAGE (COMPUTERS) N 295 76 13 73 

NATURAL SATELLITES N 245 1272 47 341 

NAUSEA N 30 38 0 35 

NAUTICAL CHARTS N 24 3 11 8 

NAVAHO MISSILE N 0 3 0 2 

NAVIER-STOKES EQUATION N 3279 8296 74 995 

NAVIGATION N 669 172 195 1104 

NAVIGATION AIDS N 1249 1500 154 1395 

NAVIGATION INSTRUMENTS N 298 722 55 368 

NAVIGATION SATELLITES N 380 646 41 487 

NAVIGATION TECHNOLOGY SATELLITES N 23 15 0 4 

NAVIGATORS N 47 56 5 47 

NAVION AIRCRAFT N 3 2 0 4 

NAVSTAR SATELLITES N 171 472 6 113 

NAVY N 660 870 166 2737 

NOM SEMICONDUCTOR DEVICES N 1 20 1 1 

NEAR FIELDS N 464 1347 8 269 

NEAR INFRARED RADIATION N 400 1878 5 273 

NEAR ULTRAVIOLET RADIATION N 84 261 0 24 

NEAR WAKES N 91 395 0 38 

NEARSHORE WATER N 32 126 3 31 

NEBRASKA N 103 37 10 108 

NEBULAE N 399 3435 82 229 

NECK (ANATOMY) N 102 83 7 52 

NEEDLE BEARINGS N 3 4 0 2 

NEEDLES N 28 57 1 33 

NEEDS (DATA SYSTEM) N 13 19 0 12 

NEEL TEMPERATURE N 35 24 2 4 

NEGATIVE CONDUCTANCE N 21 208 2 19 

NEGATIVE ELECTRON AFFINITY N 18 31 0 4 

NEGATIVE FEEDBACK N 40 282 11 21 

NEGATIVE IONS N 148 327 5 55 

NEGATIVE RESISTANCE CIRCUITS N 43 154 2 30 

NEGATIVE RESISTANCE DEVICES N 56 778 3 21 

NEGATRONS N 12 17 0 1 

NEMBUTAL (TRADEMARK) N 2 19 0 0 

NEMESIS (STAR) N 10 40 0 0 

NEODYMIUM N 345 993 3 234 

NEODYMIUM ALLOYS N 22 94 0 9 

NEODYMIUM COMPOUNDS N 71 158 0 39 

NEODYMIUM ISOTOPES N 42 141 0 6 

NEODYMIUM LASERS N 587 2610 5 382 

NEON N 589 1610 9 286 

NEON ISOTOPES N 91 298 0 18 

NEOPENTANE N 10 16 0 5 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**"***** SUBJECT TERM •****** TYPE STAR IAA NLN OTHER 

NEOPLASMS N 45 14 33 60 

NEPAL N 4 14 2 7 

NEPHANALYSIS N 83 133 0 57 

NEPHELINE N 3 6 2 3 

NEPHELITE N 2 0 0 1 

NEPHELOMETERS N 92 115 9 75 

NEPHRITIS N 3 7 3 2 

NEPTUNE (PLANET) N 128 494 13 83 

NEPTUNE ATMOSPHERE N 23 122 0 8 

NEPTUNE SATELLITES N 0 12 0 1 

NEPTUNIUM N 69 0 1 28 

NEPTUNIUM COMPOUNDS N 7 0 0 3 

NEPTUNIUM ISOTOPES N 7 4 0 4 

NEREID N 3 21 0 0 

NERNST-ETTINGSHAUSEN EFFECT N 27 50 2 6 

NERVES N 151 196 42 161 

NERVOUS SYSTEM N 322 322 280 290 

NETHERLANDS N 507 208 43 246 

NETHERLANDS SPACE PROGRAM N 8 10 0 1 

NETS N 57 24 3 137 

NETWORK ANALYSIS N 1683 4953 331 885 

NETWORK CONTROL N 219 617 12 145 

NETWORK SYNTHESIS N 821 6515 181 453 

NETWORKS N 428 85 81 312 

NEUMANN PROBLEM N 138 481 7 31 

NEURAL NETS N 383 891 9 145 

NEURASTHENIA N 2 2 1 1 

NEURISTORS N 13 18 0 3 

NEURITIS N 1 11 0 2 

NEUROBLAST$ N 6 3 0 4 

NEUROGLIA N 8 25 7 6 

NEUROLOGY N 248 383 364 242 

NEUROMUSCULAR TRANSMISSION N 218 416 50 104 

NEURONS N 287 945 84 240 

NEUROPHYSIOLOGY N 494 1635 284 237 

NEUROPSYCHIATRY N 28 32 53 21 

NEUROSES N 10 72 4 12 

NEUROSPORA N 6 11 0 15 

NEUROTIC DEPRESSION N 0 18 3 0 

NEUROTRANSMITTERS N 45 48 32 31 

NEUROTROPISM N 8 10 0 3 

NEUTRAL ATMOSPHERES N 38 123 0 19 

NEUTRAL ATOMS N 104 173 0 32 

NEUTRAL BEAMS N 415 544 5 144 

NEUTRAL BUOYANCY SIMULATION N 52 47 0 18 

NEUTRAL CURRENTS N 28 42 0 19 

NEUTRAL GASES N 191 949 1 47 

NEUTRAL PARTICLES N 331 1179 1 140 

NEUTRAL SHEETS N 76 424 5 7 

NEUTRAL! ZERS N 82 111 5 65 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

NEUTRINO BEAMS N 26 52 0 13 

NEUTRINOS N 566 1781 49 168 

NEUTRON ABSORBERS N 129 34 2 50 

NEUTRON ACTIVATION ANALYSIS N 623 580 25 295 

NEUTRON BEAMS N 238 65 2 120 

NEUTRON COUNTERS N 538 472 8 176 

NEUTRON CROSS SECTIONS N 602 111 15 196 

NEUTRON DECAY N 133 50 2 41 

NEUTRON DIFFRACTION N 349 184 24 135 

NEUTRON DISTRIBUTION N 158 91 3 45 

NEUTRON EMISSION N 315 246 2 121 

NEUTRON FLUX DENSITY N 477 425 3 146 

NEUTRON IRRADIATION N 1168 814 17 555 

NEUTRON PHYSICS N 214 50 19 90 

NEUTRON RADIOGRAPHY N 39 35 1 19 

NEUTRON SCATTERING N 1004 240 58 289 

NEUTRON SOURCES N 447 147 12 174 

NEUTRON SPECTRA N 587 153 11 178 

NEUTRON SPECTROMETERS N 238 35 6 81 

NEUTRON STARS N 453 3648 37 107 

NEUTRON THERMALIZATION N 67 15 3 18 

NEUTRONS N 1330 474 115 636 

NEVADA N 423 85 79 256 

NEW BRUNSWICK N 2 9 1 1 

NEW ENGLAND (US) N 130 30 20 76 

NEW GUINEA (ISLAND) N 15 13 0 105 

NEW HAMPSHIRE N 68 13 5 55 

NEW HAVEN (CT) N 1 1 0 0 

NEW JERSEY N 132 41 23 158 

NEW MEXICO N 484 136 45 431 

NEW MOONS PROJECT N 1 0 0 4 

NEW YORK N 429 145 73 303 

NEW YORK CITY (NY) N 2 2 6 5 

NEW ZEALAND N 87 125 30 231 

NEW ZEALAND SPACE PROGRAM N 1 1 0 0 

NEWFOUNDLAND N 2 19 2 10 

NEWS N 32 1 14 21 

NEWS MEDIA N 63 20 69 69 

NEWTON N 17 3 9 5 

NEWTON METHODS N 371 537 0 25 

NEWTON PRESSURE LAW N 9 19 0 3 

NEWTON SECOND LAW N 20 54 5 5 

NEWTON THEORY N 175 852 48 77 

NEWTON-BUSEMANN LAW N 4 20 0 1 

NEWTON-RAPHSON METHOD N 292 1145 11 72 

NEWTONIAN FLUIDS N 226 613 12 58 

NICARAGUA N 18 6 5 5 

NICHROME (TRADEMARK) N 22 121 0 30 

NICKEL N 2035 2203 57 1125 

NICKEL ALLOYS N 2770 7658 73 1736 1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

NICKEL CADMIUM BATTERIES N 649 415 16 445 

NICKEL COATINGS N 93 219 0 53 

NICKEL COMPOUNDS N 367 428 7 193 

NICKEL FLUORIDES N 7 4 0 21 

NICKEL HYDROGEN BATTERIES N 220 228 0 49 

NICKEL IRON BATTERIES N 42 13 0 11 

NICKEL ISOTOPES N 62 79 0 21 

NICKEL OXIDES N 186 209 1 84 

NICKEL PLATE N 90 46 10 76 

NICKEL STEELS N 219 959 8 89 

NICKEL ZINC BATTERIES N 98 84 1 54 

NICOTINAMIDE N 8 13 1 1 

NICOTINE N 7 22 1 9 

NICOTINIC ACID N 7 8 1 10 

NIGELLA N 1 0 0 0 

NIGER N 17 21 2 3 

NIGERIA N 18 63 3 14 

NIGHT N 272 452 4 277 

NIGHT FLIGHTS (AIRCRAFT) N 111 134 8 215 

NIGHT SKY N 214 2116 14 101 

NIGHT VISION N 310 274 11 1125 

NIGHTGLOW N 112 571 3 47 

NIGOTRONS N 2 1 0 0 

NIHON AIRCRAFT N 1 0 0 0 

NIKE BOOSTER ROCKET ENGINES N 2 3 0 2 

NIKE MISSILES N 4 3 0 27 

NIKE PROJECT N 1 0 0 2 

NIKE ROCKET VEHICLES N 17 7 0 27 

NIKE ROCKETS N 0 1 0 1 

NIKE X SYSTEMS N 4 1 0 42 

NIKE-AJAX MISSILE N 2 1 0 3 

NIKE-APACHE ROCKET VEHICLE N 36 38 0 73 

NIKE-CAJUN ROCKET VEHICLE N 7 2 1 35 

NIKE-HERCULES MISSILE N 4 0 0 46 

NIKE-HYDAC ROCKET VEHICLE N 0 2 0 14 

NIKE-IROQUOIS ROCKET VEHICLE N 1 0 0 3 

NIKE-JAVELIN ROCKET VEHICLE N 4 1 0 8 

NIKE-TOMAHAWK ROCKET VEHICLE N 32 22 0 39 

NIKE-ZEUS MISSILE N 0 0 0 46 

NIMBOSTRATUS CLOUDS N 5 21 0 3 

NIMBUS PROJECT N 31 6 3 1262 

NIMBUS SATELLITES N 238 230 5 1088 

NIMBUS 1 SATELLITE N 18 6 2 20 

NIMBUS 2 SATELLITE N 55 17 0 52 

NIMBUS 3 SATELLITE N 65 72 0 38 

NIMBUS 4 SATELLITE N 87 130 2 37 

NIMBUS 5 SATELLITE N 81 112 1 45 

NIMBUS 6 SATELLITE N 129 146 2 39 

NIMBUS 7 SATELLITE N 229 534 4 146 

NIMONIC ALLOYS N 19 260 3 11 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

NIMROD ACCELERATOR N 24 0 0 3 

NIOBATES N 124 206 3 93 

NIOBIUM N 919 1110 35 528 

NIOBIUM ALLOYS N 687 1811 13 482 

NIOBIUM CARBIDES N 57 224 0 76 

NIOBIUM COMPOUNDS N 228 294 7 103 

NIOBIUM IODIDES N 1 1 0 1 

NIOBIUM ISOTOPES N 27 7 0 6 

NIOBIUM OXIDES N 72 147 2 28 

NIOBIUM STANNIDES N 83 88 0 23 

NIOBIUM 95 N 6 2 0 1 

NITINOL ALLOYS N 27 22 1 15 

NITRAMINE PROPELLANTS N 89 75 0 128 

NITRASOL EXPLOSIVES N 1 0 0 6 

NITRATE ESTERS N 25 16 1 70 

NITRATES N 407 337 15 354 

NITRATION N 67 35 6 42 

NITRIC ACID N 357 550 6 222 

NITRIC OX IDE N 409 1800 9 173 

NITRIDES N 344 401 16 258 

NITRIDING N 119 373 4 51 

NITRILES N 166 113 15 112 

NITRITES N 55 67 2 37 

NITRO COMPOUNDS N 100 58 9 113 

NITROAMINES N 16 20 0 25 

NIT ROBACTE R N 12 7 0 4 

NITROBENZENES N 74 45 0 46 

NITROFLUORAMINES N 4 0 0 10 

NITROFORMATES N 0 1 0 1 

NITRO FORMS N 2 0 0 15 

NITROGEN N 3099 6070 121 1917 1

NITROGEN ATOMS N 68 365 3 35 

NITROGEN COMPOUNDS N 463 266 65 441 

NITROGEN DIOXIDE N 343 892 6 166 

NITROGEN FLUORIDES N 49 82 0 115 

NITROGEN HYDRIDES N 32 45 0 20 

NITROGEN IONS N 125 685 1 49 

NITROGEN ISOTOPES N 96 200 2 19 

NITROGEN LASERS N 50 400 2 28 

NITROGEN METABOLISM N 42 32 5 22 

NITROGEN OXIDES N 1664 1656 49 800 

NITROGEN PLASMA N 82 420 0 29 

NITROGEN POLYMERS N 48 6 0 87 

NITROGEN TETROXIDE N 125 131 4 373 

NITROGEN 15 N 40 51 0 9 

NITROGEN 16 N 3 1 0 1 

NITROGENATION N 12 23 9 5 

NITROGLYCERIN N 45 80 1 94 

NITROGUANIDINE N 16 10 0 40 

NITROLYSIS N 9 4 0 13 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM  •**  TYPE STAR IAA NLN OTHER 

NIT ROME THANE N 67 48 0 42 

NITRONIUM COMPOUNDS N 1 0 0 3 

NITRONIUM PERCHLORATE N 1 4 0 60 

NITROPROPANE N 2 2 0 6 

NITROSAMINE N 15 14 0 10 

NITROSO COMPOUNDS N 27 18 6 47 

NITROSYL CHLORIDES N 8 15 0 3 

NITROSYLS N 11 8 0 10 

NITROUS ACID N 23 21 0 3 

NITROUS OXIDES N 253 887 4 152 

NITROXYCHLOR IDES N 2 2 0 1 

NITRYL CHLORIDES N 2 2 0 2 

NITRYL FLUORIDES N 1 0 0 3 

NOAA SATELLITES N 292 734 9 96 

NOAA 10 SATELLITE N 1 2 0 1 

NOAA 2 SATELLITE N 34 38 0 3 

NOAA 3 SATELLITE N 9 14 0 1 

NOAA 4 SATELLITE N 17 22 0 3 

NOAA 5 SATELLITE N 14 35 0 3 

NOAA 6 SATELLITE N 43 88 0 12 

NOAA 7 SATELLITE N 42 135 0 10 

NOAA 8 SATELLITE N 11 10 0 2 

NOAA 9 SATELLITE N 5 6 0 1 

NOBELIUM N 5 1 1 3 

NOBELIUM ISOTOPES N 1 0 0 0 

NOBLE METALS N 143 131 19 73 

NOCTILUCENT CLOUDS N 74 278 8 42 

NOCTURNAL VARIATIONS N 110 468 0 25 

NODES (STANDING WAVES) N 51 133 0 25 

NODULES N 43 35 6 28 

NOESS N 2 2 0 0 

NOISE N 118 99 19 78 

NOISE (SOUND) N 841 169 176 999 

NOISE GENERATORS N 288 1090 16 144 

NOISE INJURIES N 79 83 16 31 

NOISE INTENSITY N 980 1450 39 439 

NOISE MEASUREMENT N 1044 1167 64 587 

NOISE METERS N 65 49 1 20 

NOISE POLLUTION N 760 602 173 590 

NOISE PREDICTION N 90 136 2 93 

NOISE PREDICTION (AIRCRAFT) N 241 490 2 182 

NOISE PROPAGATION N 482 512 13 238 

NOISE REDUCTION N 3315 5355 260 2000 1

NOISE SPECTRA N 922 3236 18 399 

NOISE STORMS N 18 139 2 30 

NOISE TEMPERATURE N 229 873 2 70 

NOISE THRESHOLD N 181 157 1 45 

NOISE TOLERANCE N 286 275 16 137 

NOMAD LAUNCH VEHICLE N 0 0 0 2 

NOMENCLATURES N 136 94 123 106 
910117 

NASA 

******* SUBJECT TERM ******* 

NONADIABATIC 

NOMOGRAPHS 

CONDITIONS 

NONADIABATIC THEORY 

NONAQUEOUS 

NONANES 

ELECTROLYTES 

NONCONDENSABLE GASES 

NONCONSERVATIVE FORCES 

NONDESTRUCTIVE TESTS 

NONEQUILIBRIUM 

NONELECTROLYTES 

CONDITIONS 

NONEQUILIBRIUM FLOW 

NONEQUILIBRIUM IONIZATION 

NONEQUILIBRIUM PLASMAS 

NONEQUILIBRIUM RADIATION 

NONEQUILIBRIUM THERMODYNAMICS 

NONFERROUS METALS 

NONFLAMMABLE MATERIALS 

NONGRAY ATMOSPHERES 

NONGRAY GAS 

NONHOLONOMIC EQUATIONS 

NONISOTHERMAL 

NONISENTROPICITY 

PROCESSES 

NONLINEAR EQUATIONS 

NONLINEAR EVOLUTION EQUATIONS 

NONLINEAR FEEDBACK 

NONLINEAR FILTERS 

NONLINEAR OPTICS 

NONLINEAR PROGRAMMING 

NONLINEAR SYSTEMS 

NONNEWTONIAN 

NONLINEARITY 

FLOW 

NONNEWTONIAN FLUIDS 

NONOHMIC EFFECT 

NONOSCILLATORY ACTION 

NONPARAMETRIC STATISTICS 

NONPOINT SOURCES 

NONPOLAR GASES 

NONRELATIVISTIC MECHANICS 

NONSTABILIZED 

NONRESONANCE 

OSCILLATION 

NONTHERMAL 

NONSYNCHRONIZATION 

RADIATION 

NONUNIFORM FLOW 

NONUNIFORM MAGNETIC FIELDS 

NONUNIFORM PLASMAS 

NONUNI FORMITY 

NORD 

NORADRENALINE 

NOON 

AIRCRAFT 

NORD 1500 AIRCRAFT 

COMBINED FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

220 

STAR 

22 

18 

5 

30 

17 

59 

3790 

6 

294 

161 

47 

112 

63 

64 

19 

227 

12 

7 

6 

24 

12 

2298 

93 

601 

297 

249 

134 

2968 

3802 

48 

164 

0 

17 

346 

11 

8 

127 

14 

45 

13 

217 

123 

58 

119 

117 

1 

2 

8 

6 

STATISTICS 

IAA 

117 

156 

388 

2 

150 

29 

335 

6262 

3 

916 

368 

883 

855 

75 

113 

688 

71 

107 

70 

128 

50 

340 

10344 

861 

280 

207 

3462 

853 

3250 

9447 

74 

292 

47 

11 

145 

18 

12 

225 

110 

226 

25 

514 

674 

669 

2615 

194 

69 

135 

4 

40 

NLN 

5 

0 

7 

0 

1 

1 

373 

7 

13 

36 

2 

14 

1 

31 

79 

15 

2 

0 

0 

265 

8 

6 

90 

63 

19 

249 

375 

7 

14 

0 

0 

30 

0 

0 

1 

2 

5 

2 

8 

0 

0 

2 

0 

8 

0 

0 

OTHER 

175 

9 

8 

27 

6 

5 

3302 

3 

95 

206 

73 

24 

15 

53 

25 

220 

9 

1 

2 

2 

4 

792 

85 

59 

20 

236 

256 

1225 

1714 

83 

29 

5 

1 

81 

6 

9 

25 

11 

29 

4 

53 

46 

31 

86 

19 

0 

1 

8 

2 

1

1

1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *"****** TYPE STAR IAA NLN OTHER 

NOREPINEPHRINE N 47 176 0 11 

NORLEUCINE N 1 4 0 0 

NORMAL DENSITY FUNCTIONS N 1026 2397 23 304 

NORMAL SHOCK WAVES N 83 266 5 19 

NORMALITY N 271 31 3 52 

NORMALIZING N 10 51 1 5 

NORMALIZING (HEAT TREATMENT) N 17 16 1 12 

NORMALIZING (STATISTICS) N 231 150 5 55 

NORMS N 84 179 12 28 

NORTH AMERICA N 315 374 197 133 

NORTH AMERICAN AIRCRAFT N 0 6 5 8 

NORTH AMERICAN SEARCH AND RANGING RADAR N 0 0 0 

NORTH ATLANTIC TREATY ORGANIZATION (NATO) N 133 43 180 208 

NORTH CAROL! NA N 226 47 32 220 

NORTH DAKOTA N 188 32 15 130 

NORTH KOREA N 0 0 1 5 

NORTH POLAR SPUR (ASTRONOMY) N 5 8 0 3 

NORTH SEA N 150 150 12 44 

NORTHERN HEMISPHERE N 773 2251 14 268 

NORTHERN IRELAND N 1 7 0 0 

NORTHERN SKY N 4 149 2 3 

NORTHROP AIRCRAFT N 3 25 3 24 

NORTHWEST TERRITORIES N 2 18 1 2 

NORTON COUNTY ACHONDRITE N 0 11 0 0 

NORWAY N 241 131 14 162 

NORWEGIAN SPACE PROGRAM N 29 18 0 2 

NOSE N 3 1 0 4 

NOSE (ANATOMY) N 29 39 7 13 

NOSE CONES N 366 373 2 1343 

NOSE FINS N 37 16 0 31 

NOSE INLETS N 7 15 0 12 

NOSE TIPS N 60 96 0 272 

NOSE WHEELS N 32 32 1 72 

NOSES (FOREBODIES) N 93 216 0 120 

NDSTOC N 0 3 0 1 

NOTCH SENSITIVITY N 183 509 2 87 

NOTCH STRENGTH N 264 511 14 129 

NOTCH TESTS N 453 2200 21 177 

NOTCHES N 98 183 2 30 

NOVA N 2 10 0 3 

NOVA COMPUTERS N 1 2 0 4 

NOVA LASER SYSTEM N 48 25 0 10 

NOVA LAUNCH VEHICLES N 0 1 1 37 

NOVA SATELLITES N 1 11 0 4 

NOVA SCOTIA N 1 26 1 2 

NOVAE N 144 1326 10 94 

NOVOCAIN N 2 3 0 0 

NOWCASTING N 100 84 4 5 

NOZZLE DESIGN N 611 1001 13 1275 

NOZZLE EFFICIENCY N 157 217 0 219 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

NOZZLE FLOW N 1471 4019 25 1138 

NOZZLE GEOMETRY N 646 1619 3 589 

NOZZLE INSERTS N 71 69 0 218 

NOZZLE THRUST COEFFICIENTS N 93 110 0 82 

NOZZLE WALLS N 122 132 0 85 

NOZZLELESS ROCKET ENGINES N 11 27 0 60 

NOZZLES N 232 136 9 398 

NRX REACTORS N 9 7 0 378 

NU FACTOR N 1 6 0 0 

NUCLEAR ASTROPHYSICS N 44 417 0 21 

NUCLEAR AUXILIARY POWER UNITS N 72 34 3 107 

NUCLEAR BINDING ENERGY N 195 130 5 46 

NUCLEAR CAPTURE N 145 78 6 28 

NUCLEAR CHEMISTRY N 200 29 50 121 

NUCLEAR DEFORMATION N 89 12 2 26 

NUCLEAR DEVICES N 20 6 7 7 

NUCLEAR ELECTRIC POWER GENERATION N 311 178 83 340 

NUCLEAR ELECTRIC PROPULSION N 98 180 7 57 

NUCLEAR EMULSIONS N 228 435 5 58 

NUCLEAR ENERGY N 396 327 341 331 

NUCLEAR ENGINE FOR ROCKET VEHICLES N 136 105 3 1565 

NUCLEAR EXPLOSION EFFECT N 228 144 8 696 

NUCLEAR EXPLOSIONS N 1037 206 31 2577 

NUCLEAR FISSION N 357 220 64 207 

NUCLEAR FUEL BURNUP N 60 18 1 33 

NUCLEAR FUEL ELEMENTS N 1462 95 23 1676 

NUCLEAR FUEL REPROCESSING N 76 16 7 50 

NUCLEAR FUELS N 1738 448 118 1475 

NUCLEAR FUSION N 1331 2386 119 447 

NUCLEAR GYROSCOPES N 11 13 0 1 

NUCLEAR HEAT N 46 88 0 41 

NUCLEAR INTERACTIONS N 474 717 21 139 

NUCLEAR ISOBARS N 80 22 8 28 

NUCLEAR LIGHTBULB ENGINES N 8 5 0 2 

NUCLEAR MAGNETIC RESONANCE N 1524 563 325 695 

NUCLEAR MEDICINE N 50 77 38 126 

NUCLEAR METEOROLOGY N 74 48 2 5 

NUCLEAR MODELS N 333 65 29 115 

NUCLEAR PARTICLES N 179 177 114 121 

NUCLEAR PHYSICS N 1011 214 1099 749 

NUCLEAR POTENTIAL N 24 28 5 15 

NUCLEAR POWER PLANTS N 872 386 238 1029 

NUCLEAR POWER REACTORS N 349 176 34 280 

NUCLEAR POWERED SHIPS N 20 11 6 157 

NUCLEAR PROPELLED AIRCRAFT N 13 27 4 71 

NUCLEAR PROPULSION N 207 368 40 645 

NUCLEAR PUMPED LASERS N 40 86 4 14 

NUCLEAR PUMPING N 30 51 2 18 

NUCLEAR QUADRUPOLE RESONANCE N 65 36 4 27 

NUCLEAR RADIATION N 470 328 95 944 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******>+ TYPE STAR IAA NLN OTHER 

NUCLEAR RADIATION SPECTROSCOPY N 181 47 34 67 

NUCLEAR RAMJET ENGINES N 1 4 1 24 

NUCLEAR REACTIONS N 1762 749 229 575 

NUCLEAR REACTOR CONTROL N 371 83 21 231 

NUCLEAR REACTORS N 2097 616 358 1881 

NUCLEAR RELAXATION N 23 23 2 7 

NUCLEAR RESEARCH N 785 121 54 610 

NUCLEAR RESEARCH AND TEST REACTORS N 257 37 4 143 

NUCLEAR ROCKET ENGINES N 269 327 19 457 

NUCLEAR SCATTERING N 395 111 25 140 

NUCLEAR SPIN N 402 148 36 111 

NUCLEAR STRUCTURE N 556 52 66 194 

NUCLEAR TRANSFORMATIONS N 8 36 3 4 

NUCLEAR VULNERABILITY N 12 19 0 58 

NUCLEAR WARFARE N 67 53 22 313 

NUCLEAR WARHEADS N 11 11 1 181 

NUCLEAR WEAPONS N 211 71 60 716 

NUCLEASE N 12 9 0 5 

NUCLEATE BOILING N 182 284 5 96 

NUCLEATION N 1318 1287 71 654 

NUCLEI N 63 166 6 50 

NUCLEI (CYTOLOGY) N 39 58 0 7 

NUCLEI (NUCLEAR PHYSICS) N 1064 560 70 301 

NUCLEIC ACIDS N 106 199 110 131 

NUCLEOGENESIS N 18 25 5 13 

NUCLEON POTENTIAL N 81 17 0 27 

NUCLEON-NUCLEON INTERACTIONS N 307 173 9 106 

NUCLEON-NUCLEON SCATTERING N 179 38 7 49 

NUCLEONICS N 37 35 22 25 

NUCLEONS N 766 592 22 240 

NUCLEOPHILES N 24 9 9 22 

NUCLEOSIDES N 24 64 9 24 

NUCLEOTIDES N 78 294 36 95 

NUCLIDES N 193 108 9 81 

NULL HYPOTHESIS N 101 42 3 24 

NULL ZONES N 151 145 0 135 

NUMBER THEORY N 336 182 258 138 

NUMBERS N 18 16 21 33 

NUMERICAL ANALYSIS N 14589 12330 1282 7121 3

NUMERICAL CONTROL N 1327 2593 173 806 

NUMERICAL DATA BASES N 12 2 3 1 

NUMERICAL DIFFERENTIATION N 43 68 9 13 

NUMERICAL FLOW VISUALIZATION N 315 1498 9 81 

NUMERICAL INTEGRATION N 1646 6463 64 608 

NUMERICAL STABILITY N 465 2565 13 78 

NUMERICAL WEATHER FORECASTING N 1085 2257 37 293 

NUNATAKS N 2 1 0 1 

NUSSELT NUMBER N 203 1327 0 72 

NUTATION N 189 707 8 83 

NUTATION DAMPERS N 76 229 1 9 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

NUTRIENTS N 160 92 23 143 

NUTRITION N 266 145 320 240 

NUTRITIONAL REQUIREMENTS N 149 159 40 95 

NUTS (FASTENERS) N 62 34 8 93 

NUTS (FRUITS) N 6 1 0 4 

NYLON (TRADEMARK) N 232 208 12 214 

NYQUIST DIAGRAM N 104 224 8 33 

NYQUIST FREQUENCIES N 69 255 7 16 

NYSTAGMUS N 146 220 5 22 

0 RING SEALS N 142 181 6 245 

0 STARS N 129 1950 3 29 

OAK RIDGE ISOCHRONOUS CYCLOTRON N 1 1 2 0 3 

OAO N 135 128 21 141 

OAO 1 N 0 3 0 2 

OAO 2 N 79 108 0 19 

OAO 3 N 70 330 0 47 

OASES N 10 10 0 4 

OATS N 16 15 0 7 

OBERON N 6 28 0 0 

OBESITY N 15 44 7 11 

OBJECT PROGRAMS N 87 32 2 19 

OBLATE SPHEROIDS N 93 455 1 39 

OBLIQUE COORDINATES N 33 29 1 7 

OBLIQUE SHOCK WAVES N 133 489 2 45 

OBLIQUE WINGS N 62 63 0 44 

OBLIQUENESS N 19 80 0 9 

OBSERVABILITY (SYSTEMS) N 65 563 2 6 

OBSERVATION N 411 269 65 446 

OBSERVATION AIRCRAFT N 33 35 3 106 

OBSERVATORIES N 143 17 36 297 

OBSIDIAN N 6 14 0 10 

OBSIDIAN GLASS N 1 5 0 0 

OBSTACLE AVOIDANCE N 41 95 0 17 

OCCIPITAL LOBES N 6 35 0 0 

OCCLUSION N 35 87 1 13 

OCCULTATION N 199 353 8 243 

OCCUPATION N 60 66 281 90 

OCCUPATIONAL DISEASES N 13 16 0 3 

OCCURRENCES N 43 9 1 46 

OCEAN BOTTOM N 1427 873 151 1363 

OCEAN COLOR SCANNER N 38 52 2 27 

OCEAN CURRENTS N 1791 1273 104 1348 

OCEAN DATA ACQUISITIONS SYSTEMS N 514 294 20 280 

OCEAN DYNAMICS N 275 416 20 351 

OCEAN MODELS N 672 1033 24 466 

OCEAN SURFACE N 2302 3581 55 1594 

OCEAN TEMPERATURE N 381 618 10 294 

OCEAN THERMAL ENERGY CONVERSION N 331 469 26 440 

OCEANOGRAPHIC PARAMETERS N 813 926 28 749 

OCEANOGRAPHY N 3163 1319 911 2824 
NASA COMBINED FILE POSTING STATISTICS 

910117 

•••  SUBJECT TERM ** ***** TYPE STAR IAA NLN OTHER 

OCEANS N 1111 289 271 1374 

OCTAHEDRONS N 22 35 1 14 

OCTANE N 2 10 0 2 

OCTANE NUMBER N 31 15 2 33 

OCTANES N 44 34 0 19 

OCTAVES N 33 25 0 26 

OCTETS N 10 2 0 1 

OCTOATES N 2 0 0 0 

OCTOL (EXPLOSIVE) N 3 0 0 6 

OCTOPUSES N 0 0 1 0 

OCULAR CIRCULATION N 5 28 2 7 

OCULOGRAVIC ILLUSIONS N 41 69 0 4 

OCULOMETERS N 59 111 0 45 

OCULOMOTOR NERVES N 91 254 7 26 

ODD-EVEN NUCLEI N 15 3 0 8 

ODD-ODD NUCLEI N 40 3 0 9 

ODESSA METEORITE N 0 9 0 1 

ODORS N 64 46 18 60 

OFF-ON CONTROL N 94 552 6 56 

OFFGASSING N 26 5 1 14 

OFFICE AUTOMATION N 43 12 44 10 

OFFSHORE DOCKING N 8 2 2 9 

OFFSHORE ENERGY SOURCES N 189 226 48 164 

OFFSHORE PLATFORMS N 309 196 36 271 

OFFSHORE REACTOR SITES N 14 1 0 20 

OGEE SHAPE N 8 4 0 2 

OGIVES N 147 175 1 107 

OGO N 132 147 8 120 

OGO-A N 21 19 0 14 

OGO-C N 26 43 0 14 

OG0-3 N 39 32 0 8 

OG0-4 N 69 70 1 26 

OG0-5 N 84 218 1 52 

OG0-6 N 84 161 2 37 

OH-13 HELICOPTER N 1 1 0 13 

OH-23 HELICOPTER N 0 0 0 4 

OH-4 HELICOPTER N 0 0 0 4 

OH-5 HELICOPTER N 0 1 0 9 

OH-58 HELICOPTER N 32 20 0 43 

OH-6 HELICOPTER N 29 26 0 32 

OHIO N 208 50 28 194 

OHIO RIVER (US) N 15 8 0 10 

OHMIC DISSIPATION N 234 871 0 70 

OHMMETERS N 7 9 6 23 

OHMS LAW N 45 205 15 19 

OIL ADDITIVES N 82 108 0 41 

OIL EXPLORATION N 393 250 66 299 

OIL FIELDS N 139 52 35 135 

OIL POLLUTION N 202 102 24 216 

OIL RECOVERY N 297 80 21 214 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

OIL SLICKS N 323 226 54 210 

OILS N 588 293 84 562 

OKHANSK METEORITE N 0 1 0 0 

OKLAHOMA N 205 66 1 1 114 

OLEIC ACID N 24 18 0 8 

OLFACTORY PERCEPTION N 32 52 12 23 

OLIGOMERS N 8 10 0 3 

OLIVINE N 117 1119 1 60 

OMAN N 2 5 0 4 

OMEGA NAVIGATION SYSTEM N 291 396 12 259 

OMEGA-MESONS N 13 0 0 1 

OMEGATRONS N 12 6 0 4 

OMICRON CETI STAR N 0 23 0 1 

OMNIDIRECTIONAL ANTENNAS N 114 131 0 106 

OMNIDIRECTIONAL RADIO RANGES N 30 29 1 9 

ON-LINE PROGRAMMING N 700 357 72 424 

ON-LINE SYSTEMS N 647 212 81 403 

ONBOARD DATA PROCESSING N 413 1161 10 131 

ONBOARD EQUIPMENT N 1020 1314 28 936 

ONE DIMENSIONAL FLOW N 513 1801 18 192 

ONSAGER PHENOMENOLOGICAL COEFFICIENT N 5 12 0 3 

ONSAGER RELATIONSHIP N 21 119 3 2 

ONTARIO N 14 134 9 19 

ONTOGENY N 14 67 11 9 

OORT CLOUD N 34 287 0 4 

OPACIFIERS N 3 7 0 3 

OPACITY N 234 895 9 131 

OPALESCENCE N 9 6 1 9 

OPEN CHANNEL FLOW N 90 90 4 19 

OPEN CIRCUIT VOLTAGE N 51 693 0 18 

OPEN CLUSTERS N 67 907 0 8 

OPEN PROJECT N 4 3 0 20 

OPENINGS N 191 84 3 183 

OPERATING COSTS N 278 313 5 130 

OPERATING SYSTEMS (COMPUTERS) N 978 296 192 441 

OPERATING TEMPERATURE N 226 878 0 114 

OPERATIONAL AMPLIFIERS N 85 362 51 121 

OPERATIONAL CALCULUS N 23 59 36 14 

OPERATIONAL HAZARDS N 157 165 12 169 

OPERATIONAL PROBLEMS N 576 1018 19 328 

OPERATIONS N 61 24 28 147 

OPERATIONS RESEARCH N 2183 560 377 1587 

OPERATOR PERFORMANCE N 813 1263 25 461 

OPERATORS N 8 12 0 8 

OPERATORS (MATHEMATICS) N 2184 4853 327 700 

OPERATORS (PERSONNEL) N 500 193 15 543 

OPHIUCHI CLOUDS N 2 114 0 2 

OPHTHALMODYNAMOMETRY N 7 9 0 1 

OPHTHALMOLOGY N 114 246 31 55 

OPIK THEORY N 1 7 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*****•• SUBJECT TERM *****'** TYPE STAR IAA NLN OTHER 

OPTICAL ACTIVITY N 39 187 6 34 

OPTICAL BISTABILITY N 86 822 5 10 

OPTICAL COMMUNICATION N 1197 3552 213 1205 

OPTICAL COMPUTERS N 80 490 5 69 

OPTICAL CORRECTION PROCEDURE N 177 1387 4 89 

OPTICAL CORRELATORS N 1 41 0 0 

OPTICAL COUNTERMEASURES N 25 12 0 323 

OPTICAL COUPLING N 205 1699 12 115 

OPTICAL DATA PROCESSING N 1007 3007 193 647 

OPTICAL DATA STORAGE MATERIALS N 40 228 11 30 

OPTICAL DENSITY N 293 460 5 143 

OPTICAL DEPOLARIZATION N 14 127 2 13 

OPTICAL DISKS N 46 74 6 49 

OPTICAL EMISSION SPECTROSCOPY N 195 863 16 58 

OPTICAL EQUIPMENT N 1943 1913 395 3124 

OPTICAL FIBERS N 619 1605 0 138 

OPTICAL FILTERS N 585 1766 16 500 

OPTICAL GYROSCOPES N 36 426 7 26 

OPTICAL HETERODYNING N 213 1239 7 83 

OPTICAL ILLUSION N 21 229 8 6 

OPTICAL MATERIALS N 414 500 0 220 

OPTICAL MEASUREMENT N 1314 3508 142 852 

OPTICAL MEASURING INSTRUMENTS N 984 2516 178 763 

OPTICAL MEMORY (DATA STORAGE) N 131 614 22 148 

OPTICAL MICROSCOPES N 140 371 19 88 

OPTICAL PATHS N 273 1161 8 135 

OPTICAL POLARIZATION N 165 1757 12 72 

OPTICAL PROPERTIES N 4100 4960 573 3233 1

OPTICAL PUMPING N 904 4353 35 542 

OPTICAL PYROMETERS N 42 89 2 44 

OPTICAL RADAR N 1352 2452 55 1238 

OPTICAL RANGE FINDERS N 58 115 1 81 

OPTICAL REFLECTION N 307 1756 20 179 

OPTICAL RELAY SYSTEMS N 19 17 3 18 

OPTICAL RESONANCE N 132 1470 12 60 

OPTICAL RESONATORS N 139 2787 16 93 

OPTICAL SATELLITE TRACKING PROGRAM N 11 13 0 9 

OPTICAL SCANNERS N 524 1280 31 478 

OPTICAL SLANT RANGE N 14 12 0 4 

OPTICAL SWITCHING N 37 377 0 26 

OPTICAL THICKNESS N 258 4341 1 113 

OPTICAL TRACKING N 610 959 15 1536 

OPTICAL TRANSFER FUNCTION N 90 433 10 46 

OPTICAL TRANSITION N 59 926 6 42 

OPTICAL WAVEGUIDES N 454 3765 55 228 

OPTICS N 364 725 401 475 

OPTIMAL CONTROL N 2417 9348 364 894 1

OPTIMIZATION N 9546 18028 661 5446 3

OPTIONS N 44 12 4 34 

OPTOELECTRONIC DEVICES N 86 616 0 101 
910117 

NASA 

******* SUBJECT TERM ******* 

OPTOGALVANIC SPECTROSCOPY 

ORAL 

OPTOMETRY 

HYGIENE 

ORB IS 

ORBIS CAL SATELLITE 

ORBIT CALCULATION 

ORBIT DECAY 

ORBIT INSERTION 

COMBINED 

ORBIT MANEUVERING ENGINE (SPACE SHUTTLE) 

ORBIT PERTURBATION 

ORBIT SPECTRUM UTILIZATION 

ORBIT TRANSFER VEHICLES 

ORBITAL ASSEMBLY 

ORBITAL ELEMENTS 

ORBITAL LAUNCHING 

ORBITAL LIFETIME 

ORBITAL MANEUVERING VEHICLES 

ORBITAL MANEUVERS 

ORBITAL MECHANICS 

ORBITAL POSITION ESTIMATION 

ORBITAL RENDEZVOUS 

ORBITAL RESONANCES (CELESTIAL MECHANICS) 

ORBITAL SERVICING 

ORBITAL SHOTS 

ORBITAL SPACE TESTS 

ORBITAL VELOCITY 

ORBITAL WORKERS 

ORBITAL WORKSHOPS 

ORBITING 

ORBITALS 

DIPOLES 

ORBITING FROG OTOLITH 

ORBITING LUNAR STATIONS 

ORDER-DISORDER 

ORCHARDS 

ORBITS 

ORBITRONS 

TRANSFORMATIONS 

ORGAN 

OREGON 

ORDNANCE 

WEIGHT 

ORGANIC 

ORGANELLES 

ALUMINUM COMPOUNDS 

ORGANIC BORON COMPOUNDS 

ORGANIC CHARGE TRANSFER SALTS 

ORGANIC CHEMISTRY 

ORGANIC COMPOUNDS 

ORGANIC COOLANTS 

ORGANIC COOLED REACTORS 

ORGANIC GERMANIUM COMPOUNDS 

ORGANIC LASERS 

ORGANIC LIQUIDS 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

STAR 

9 

32 

0 

1 

7 

1190 

143 

0 

59 

426 

33 

459 

330 

457 

31 

91 

225 

100 

1236 

166 

368 

48 

356 

2 

62 

94 

1 1 

134 

55 

4 

7 

4 

7 

412 

21 

201 

136 

344 

3 

7 

6 

1 

6 

277 

1735 

24 

34 

4 

48 

135 

STATISTICS 

62 

IAA 

100 

2 

0 

1 

3471 

250 

0 

31 

2236 

483 

694 

191 

3912 

167 

83 

422 

158 

3010 

594 

351 

243 

626 

53 

10 

316 

48 

150 

24 

5 

6 

11 

260 

19 

772 

13 

67 

90 

90 

5 

9 

53 

273 

1122 

18 

2 

3 

213 

561 

NLN 

0 

0 

2 

9 

24 

0 

0 

1 

13 

3 

0 

0 

3 

7 

2 

4 

11 

96 

6 

0 

0 

0 

0 

0 

9 

10 

0 

0 

0 

0 

7 

20 

44 

29 

58 

0 

1 

3 

0 

0 

1061 

503 

5 

6 

2 

1 

OTHER 

16 

0 

1 

9 

670 

63 

0 

23 

160 

19 

143 

179 

236 

415 

7 

89 

47 

153 

139 

866 

9 

197 

4 

4 

42 

57 

124 

29 

2 

3 

5 

3 

456 

5 

208 

570 

127 

2 

8 

11 

2 

7 

339 

1131 

7 

9 

67 

33 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ****;t.ll<* TYPE STAR IAA NLN OTHER 

ORGANIC LITHIUM COMPOUNDS N 24 24 1 6 

ORGANIC MATERIALS N 489 634 49 468 

ORGANIC MODERATED REACTORS N 4 0 1 2 

ORGANIC NITRATES N 29 18 3 17 

ORGANIC PEROXIDES N 11 16 1 4 

ORGANIC PHOSPHORUS COMPOUNDS N 151 85 7 185 

ORGANIC SEMICONDUCTORS N 37 137 9 18 

ORGANIC SILICON COMPOUNDS N 41 68 6 47 

ORGANIC SOLIDS N 11 33 0 24 

ORGANIC SULFUR COMPOUNDS N 71 82 8 31 

ORGANIC TIN COMPOUNDS N 13 6 1 25 

ORGANIC WASTES (FUEL CONVERSION) N 88 165 20 60 

ORGANISMS N 139 119 42 167 

ORGANIZATIONS N 654 331 1139 749 

ORGANIZING N 74 110 80 77 

ORGANOMETALLIC COMPOUNDS N 673 836 204 428 

ORGANOMETALLIC POLYMERS N 65 55 4 66 

ORGANS N 123 121 52 138 

ORGUEIL METEORITE N 0 72 0 5 

ORIENTATION N 137 427 9 115 

ORIFICE FLOW N 153 423 5 57 

ORIFICES N 230 86 6 198 

ORIGINS N 38 18 51 78 

ORION (RADIO INTERFEROMETRY NETWORK) N 4 2 0 0 

ORION CONSTELLATION N 88 321 2 49 

ORION NEBULA N 67 576 1 10 

ORIONID METEOROIDS N 13 66 0 5 

ORLICZ SPACE N 3 3 1 1 

ORNSTEIN-UHLENBECK PROCESS N 9 8 0 1 

OROGRAPHY N 328 727 7 72 

ORR-SOMMERFELD EQUATIONS N 58 213 2 14 

ORTHICONS N 4 8 2 13 

ORTHO HYDROGEN N 17 61 0 13 

ORTHO PARA CONVERSION N 8 33 0 5 

ORTHOGONAL FUNCTIONS N 505 1060 71 172 

ORTHOGONAL MULTIPLEXING THEORY N 24 41 0 9 

ORTHOGONAL! TY N 548 1186 38 234 

ORTHOGRAPHY N 11 17 21 13 

ORTHONORMAL FUNCTIONS N 74 171 2 33 

ORTHOPEDICS N 30 20 16 27 

ORTHOPHOTOGRAPHY N 62 144 6 20 

ORTHOSTATIC TOLERANCE N 264 398 2 91 

ORTHOTROPIC CYLINDERS N 47 221 0 16 

ORTHOTROPIC PLATES N 196 1412 5 61 

ORTHOTROPIC SHELLS N 100 872 2 43 

ORTHOTROPISM N 96 468 4 39 

OSCILLATING CYLINDERS N 73 369 6 30 

OSCILLATING FLOW N 409 2651 16 151 

OSCILLATION DAMPERS N 169 289 4 96 

OSCILLATIONS N 1985 2300 179 1230 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

OSCILLATOR STRENGTHS N 22 428 0 6 

OSCILLATORS N 1181 1719 168 1288 

OSCILLOGRAPHS N 154 1746 16 169 

OSCILLOSCOPES N 249 251 45 261 

OSEEN APPROXIMATION N 23 145 1 5 

OSMIUM N 75 53 5 24 

OSMIUM ALLOYS N 8 9 0 7 

OSMIUM COMPOUNDS N 19 37 0 5 

OSMIUM ISOTOPES N 15 28 0 5 

OSMOMETERS N 6 6 2 13 

OSMOSIS N 210 205 33 159 

oso N 79 95 10 124 

oso-c N 5 9 0 1 

OS0-1 N 13 15 0 29 

OS0-2 N 2 7 0 5 

OS0-3 N 19 51 0 10 

OS0-4 N 13 39 0 13 

OS0-5 N 14 30 0 8 

OS0-6 N 13 19 0 6 

OS0-7 N 47 126 0 40 

OS0-8 N 43 157 0 19 

OSPREY MISSILE N 1 0 0 0 

OSS-1 PAYLOAD N 20 25 0 2 

OSTA-1 PAYLOAD N 15 17 0 9 

OSTA-2 PAYLOAD N 2 1 0 4 

OSTA-3 PAYLOAD N 0 7 0 3 

OSTEOPOROSIS N 57 37 5 26 

OTOLARYNGOLOGY N 10 45 9 3 

OTOLITH ORGANS N 127 202 2 52 

OTOLOGY N 20 93 6 6 

OTS (ESA) N 149 234 1 7 

OTTO CYCLE N 29 43 0 35 

OUTCROPS N 32 13 1 12 

OUTER BANKS (NC) N 2 2 0 0 

OUTER PLANETS EXPLORERS N 92 254 15 91 

OUTER RADIATION BELT N 41 210 0 27 

OUTER SPACE TREATY N 33 454 27 33 

OUTGASSING N 470 614 4 274 

OUTLET FLOW N 67 268 1 22 

OUTLETS N 33 35 3 24 

OUTLIERS (LANDFORMS) N 8 1 0 0 

OUTLIERS (STATISTICS) N 57 4 2 5 

OUTPUT N 1190 451 86 1005 

OV-1 AIRCRAFT N 13 5 0 55 

OV-1 SATELLITES N 58 32 0 13 

OV-10 AIRCRAFT N 7 6 0 69 

OV-2 SATELLITES N 1 2 0 0 

OV-3 SATELLITES N 12 11 0 2 

OV-4 SATELLITES N 1 1 0 0 

OV-5 SATELLITES N 5 4 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

OVARIES N 10 8 4 8 

OVENS N 70 27 9 62 

OVER-THE-HORIZON RADAR N 70 62 1 310 

OVERCONSOLIDATION N 3 2 0 3 

OVERHAUSER EFFECT N 6 2 0 5 

OVERPRESSURE N 262 178 0 278 

OVERVOLTAGE N 158 63 8 108 

OXALATES N 54 28 2 29 

OXALIC ACID N 27 18 1 20 

OXAMIC ACIDS N 3 1 0 1 

OXAZOLE N 18 13 0 23 

OXIDASE N 24 43 11 16 

OXIDATION N 3029 2918 257 1907 

OXIDATION RESISTANCE N 535 1708 8 546 

OXIDATION-REDUCTION REACTIONS N 385 178 23 143 

OXIDE FILMS N 318 1896 14 158 

OXIDES N 1226 459 98 997 

OXIDIZERS N 337 470 7 560 

OXIMETRY N 14 34 1 13 

OXYACETYLENE N 17 27 10 18 

OXYFLUORIDES N 9 14 0 17 

OXYGEN N 4006 5657 157 2596 1

OXYGEN AFTERGLOW N 12 50 0 1 

OXYGEN ANALYZERS N 75 49 1 64 

OXYGEN ATOMS N 357 1620 4 135 

OXYGEN BREATHING N 119 298 2 57 

OXYGEN COMPOUNDS N 176 91 15 99 

OXYGEN CONSUMPTION N 389 1387 9 163 

OXYGEN FLUORIDES N 33 20 0 146 

OXYGEN IONS N 192 1314 2 56 

OXYGEN ISOTOPES N 175 431 5 56 

OXYGEN MASKS N 67 94 2 70 

OXYGEN METABOLISM N 192 445 13 65 

OXYGEN PLASMA N 46 128 0 34 

OXYGEN PRODUCTION N 194 272 4 114 

OXYGEN RECOMBINATION N 68 179 0 25 

OXYGEN REGULATORS N 43 23 0 38 

OXYGEN SPECTRA N 76 1824 2 21 

OXYGEN SUPPLY EQUIPMENT N 220 283 12 218 

OXYGEN TENS I ON N 69 602 1 32 

OXYGEN 17 N 4 22 0 1 

OXYGEN 18 N 51 128 0 25 

OXYGEN-HYDROCARBON ROCKET ENGINES N 51 36 0 61 

OXYGENATION N 125 143 24 63 

OXYHALIDES N 6 15 0 7 

OXYHEMOGLOBIN N 18 80 0 12 

OXYNITRIDES N 27 176 0 17 

OZONATES N 10 2 0 5 

OZONE N 2152 3001 162 1115 

OZONE DEPLETION N 223 481 0 71 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

OZONE FLUORIDE N 2 0 0 1 

OZONIDES N 5 5 1 10 

OZONOMETRY N 269 1221 11 75 

OZONOSPHERE N 139 405 9 66 

P BAND N 7 7 0 7 

P WAVES N 229 200 0 86 

P.A.C.M. TELEMETRY N 5 6 0 13 

P-I-N JUNCTIONS N 115 861 3 124 

P-N JUNCTIONS N 479 2825 39 238 

P-N-P JUNCTIONS N 37 211 2 133 

P-N-P-N JUNCTIONS N 31 83 1 17 

P-TYPE SEMICONDUCTORS N 316 1501 3 169 

p- 1 ENGINE N 2 0 0 1 

P-1052 AIRCRAFT N 0 0 1 0 

P-1127 AIRCRAFT N 9 13 0 7 

P-1154 AIRCRAFT N 0 3 0 0 

P-160 AIRCRAFT N 1 0 0 0 

P-166 AIRCRAFT N 1 1 0 0 

P-3 AIRCRAFT N 47 63 1 313 

P-308 AIRCRAFT N 1 0 0 0 

P-51 AIRCRAFT N 0 3 6 4 

P-531 HELICOPTER N 7 9 0 23 

PA-34 SENECA AIRCRAFT N 1 2 0 1 

PACIFIC ISLANDS N 126 35 41 175 

PACIFIC NORTHWEST (US) N 56 32 7 61 

PACIFIC OCEAN N 1326 1466 81 890 

PACKAGES N 40 9 2 31 

PACKAGING N 352 108 75 659 

PACKET SWITCHING N 187 351 15 95 

PACKET TRANSMISSION N 97 272 1 42 

PACKETS (COMMUNICATION) N 135 107 1 92 

PACKING N 15 17 2 18 

PACKING DENSITY N 131 381 1 67 

PACKINGS (SEALS) N 64 23 4 89 

PAD N 13 17 0 9 

PADDLES N 19 11 1 23 

PADE APPROXIMATION N 107 199 15 41 

PAGEOS SATELLITE N 51 56 0 12 

PAIN N 59 65 18 32 

PAIN SENSITIVITY N 11 47 6 5 

PAINTS N 534 207 77 597 

PAIR PRODUCTION N 465 728 8 103 

PAKISTAN N 52 23 16 30 

PAKISTAN SPACE PROGRAM N 1 8 0 2 

PALAPA SATELLITES N 4 28 0 16 

PALAPA 2 SATELLITE N 3 5 0 14 

PALEOBIOLOGY N 30 104 17 36 

PALEOCLIMATOLOGY N 88 111 0 15 

PALEOMAGNETISM N 141 418 22 81 

PALEONTOLOGY N 197 183 244 260 
NASA COMBINED FILE POSTING STATISTICS 

910117 

****•*.+: SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PALEOZOIC ERA N 0 2 0 0 

PALLADIUM N 404 212 12 170 

PALLADIUM ALLOYS N 146 146 2 54 

PALLADIUM COMPOUNDS N 72 54 1 22 

PALLADIUM ISOTOPES N 2 2 0 0 

PALMAR SWEAT INDEX N 1 2 0 0 

PALMGREN-MINER RULE N 45 70 0 9 

PALMITIC ACID N 3 11 0 0 

PALO VERDE VALLEY (CA) N 4 0 1 0 

PAMPAS N 3 6 0 0 

PANAMA N 71 10 7 60 

PANAMA CANAL ZONE N 14 2 1 2 

PANAVIA MILITARY AIRCRAFT N 2 7 0 0 

PANCREAS N 27 38 8 16 

PANEL FLUTTER N 144 398 2 102 

PANEL METHOD (FLUID DYNAMICS) N 261 450 2 58 

PANELS N 925 1178 16 1002 

PANIC N 4 5 0 1 

PANORAMIC CAMERAS N 47 114 2 30 

PANORAMIC SCANNING N 28 98 0 28 

PANSPERMIA N 4 18 0 0 

PANT PROGRAM N 7 10 1 45 

PANTAR CHONDRITES N 1 1 0 0 

PAPAIN N 1 1 0 0 

PAPER (MATER I A L ) N 84 33 39 125 

PAPER CHROMATOGRAPHY N 25 41 19 29 

PAPERS N 135 41 201 191 

PAPILLAE N 0 10 0 0 

PAPUA NEW GUINEA N 9 15 53 22 

PARA HYDROGEN N 20 98 5 14 

PARABOLAS N 104 148 7 57 

PARABOLIC ANTENNAS N 335 690 2 278 

PARABOLIC BODIES N 105 250 2 58 

PARABOLIC DIFFERENTIAL EQUATIONS N 431 1480 29 101 

PARABOLIC FLIGHT N 69 157 0 18 

PARABOLIC REFLECTORS N 490 1035 7 189 

PARABOLOID MIRRORS N 134 403 3 47 

PARACHUTE DESCENT N 242 493 13 425 

PARACHUTE FABRICS N 93 158 5 108 

PARACHUTES N 297 339 26 640 

PARACHUTING INJURY N 15 23 0 13 

PARACONE N 0 4 0 0 

PARADOXES N 19 67 11 2 

PARAFFINS N 119 130 8 51 

PARAGLIDERS N 8 16 2 38 

PARAGUAY N 6 1 2 0 

PARALLAX N 71 367 29 86 

PARALLEL COMPUTERS N 196 233 9 55 

PARALLEL FLOW N 124 671 3 37 

PARALLEL PLATES N 234 1269 3 102 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PARALLEL PROCESSING (COMPUTERS) N 2082 2437 97 686 

PARALLEL PROGRAMMING N 347 181 16 97 

PARALLELEPIPEDS N 34 117 1 11 

PARALLELOGRAMS N 15 51 0 1 

PARALYSIS N 26 17 1 17 

PARAMAGNETIC RESONANCE N 96 77 22 54 

PARAMAGNETISM N 199 270 30 89 

PARAMECIA N 16 21 0 5 

PARAMETER IDENTIFICATION N 1576 2867 26 438 

PARAMETERIZATION N 2515 2558 36 1009 

PARAMETRIC AMPLIFIERS N 206 1287 34 206 

PARAMETRIC DIODES N 8 40 1 13 

PARAMETRIC FREQUENCY CONVERTERS N 46 270 2 40 

PARAMETRONS N 11 27 2 4 

PARANASAL SINUSES N 2 16 0 1 

PARAPLASTS N 0 0 0 1 

PARASITES N 26 14 34 63 

PARASITIC DISEASES N 13 17 22 59 

PARATHYROID GLAND N 18 10 5 6 

PARAVULCOONS N 0 0 0 

PARAWINGS N 41 36 2 50 

PARENTERAL FUNCTIONS N 1 0 0 6 

PARENTS N 3 0 5 2 

PARITY N 341 97 9 95 

PARKING N 9 20 1 7 

PARKING ORBITS N 72 87 1 161 

PARKINSON DISEASE N 5 21 5 2 

PARKS N 46 15 12 20 

PARSING ALGORITHMS N 190 28 4 46 

PARTIAL DIFFERENTIAL EQUATIONS N 3266 7159 357 1022 1

PARTIAL PRESSURE N 307 830 2 132 

PARTICLE ACCELERATION N 767 3325 14 207 

PARTICLE ACCELERATOR TARGETS N 349 75 3 135 

PARTICLE ACCELERATORS N 1350 395 77 643 

PARTICLE BEAMS N 730 517 19 467 

PARTICLE CHARGING N 19 39 2 9 

PARTICLE COLLISIONS N 1417 2444 104 487 

PARTICLE DENSITY (CONCENTRATION) N 632 1634 6 241 

PARTICLE DIFFUSION N 511 1739 11 158 

PARTICLE EMISSION N 487 477 20 178 

PARTICLE ENERGY N 548 2808 14 210 

PARTICLE FLUX DENSITY N 299 2178 4 74 

PARTICLE IN CELL TECHNIQUE N 92 214 2 16 

PARTICLE INTENSITY N 61 190 1 15 

PARTICLE INTERACTIONS N 1898 2960 165 760 

PARTICLE LADEN JETS N 36 132 0 5 

PARTICLE MASS N 373 1001 5 102 

PARTICLE MOTION N 996 3921 80 376 

PARTICLE PRECIPITATION N 125 416 4 48 

PARTICLE PRODUCTION N 876 1360 21 312 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PARTICLE SIZE DISTRIBUTION N 3216 6000 60 1786 1

PARTICLE SPIN N 374 199 31 95 

PARTICLE TELESCOPES N 151 542 1 57 

PARTICLE THEORY N 316 452 62 194 

PARTICLE TRACKS N 216 451 5 116 

PARTICLE TRAJECTORIES N 1096 2066 8 349 

PARTICLES N 1275 164 328 1286 

PARTICULATE SAMPLING N 498 707 38 267 

PARTICULATES N 737 674 23 145 

PARTITIONS N 3 22 2 18 

PARTITIONS (MATHEMATICS) N 308 470 25 85 

PARTITIONS (STRUCTURES) N 43 30 3 16 

PARTONS N 58 10 3 33 

PAS N 16 10 0 159 

PASCAL (PROGRAMMING LANGUAGE) N 251 114 121 55 

PASCHEN SERIES N 14 145 0 11 

PASSAGEWAYS N 35 9 7 19 

PASSENGER AIRCRAFT N 338 1089 50 222 

PASSENGERS N 457 639 32 285 

PASSIVE L-BAND RADIOMETERS N 24 22 0 8 

PASSIVE SATELLITES N 42 31 0 45 

PASSIVITY N 306 262 12 179 

PASTE (CONSISTENCY) N 9 1 0 6 

PASTES N 43 38 3 35 

PASTEURIZING N 3 5 1 3 

PATCH TESTS N 14 47 0 3 

PATENT APPLICATIONS N 1497 11 13 159 

PATENT POLICY N 345 17 104 161 

PATENTS N 5517 50 201 377 

PATHFINDER NUCLEAR REACTOR N 2 0 0 4 

PATHOGENESIS N 99 231 25 95 

PATHOGENS N 47 22 18 71 

PATHOLOGICAL EFFECTS N 194 564 34 94 

PATHOLOGY N 181 125 240 258 

PATHS N 52 50 6 20 

PATIENTS N 105 293 39 117 

PATRIOT MISSILE N 5 11 0 114 

PATROLS N 9 13 3 52 

PATTERN METHOD (FORECASTING) N 41 6 3 15 

PATTERN RECOGNITION N 3567 3590 325 1627 

PATTERN REGISTRATION N 310 204 3 76 

PATTERNS N 45 52 14 38 

PATTERSON MAP N 10 5 2 7 

PAULI EXCLUSION PRINCIPLE N 52 48 9 13 

PAVEMENTS N 884 125 48 767 

PAYLOAD ASSIST MODULE N 9 34 0 31 

PAYLOAD CONTROL N 92 102 0 39 

PAYLOAD DELIVERY (STS) N 100 164 3 88 

PAYLOAD DEPLOYMENT & RETRIEVAL SYSTEM N 30 32 0 15 

PAYLOAD INTEGRATION N 112 164 0 123 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PAYLOAD INTEGRATION PLAN N 41 88 0 124 

PAYLOAD MASS RATIO N 86 163 0 82 

PAYLOAD RETRIEVAL (STS) N 52 69 1 25 

PAYLOAD STATIONS N 28 26 0 21 

PAYLOAD TRANSFER N 40 85 0 20 

PAYLOADS N 1945 2513 32 3036 

PCM TELEMETRY N 101 225 4 87 

PD-808 AIRCRAFT N 1 0 0 0 

PDP COMPUTERS N 178 33 8 87 

PDP 10 COMPUTER N 46 6 0 32 

PDP 11 COMPUTER N 158 37 15 37 

PDP 11/20 COMPUTER N 11 1 0 3 

PDP 11/40 COMPUTER N 15 8 0 6 

PDP 11/45 COMPUTER N 47 2 0 1 

PDP 11/50 COMPUTER N 6 0 0 1 

PDP 11/70 COMPUTER N 34 7 0 8 

PDP 12 COMPUTER N 1 1 0 2 

PDP 15 COMPUTER N 6 1 0 0 

PDP 7 COMPUTER N 4 0 0 5 

PDP 8 COMPUTER N 88 18 0 44 

PDP 9 COMPUTER N 26 5 0 12 

PEACETIME N 34 25 13 67 

PEAKS N 22 24 0 7 

PEAKS (LANDFORMS) N 3 7 0 0 

PEARLITE N 51 79 1 17 

PEARSON DISTRIBUTIONS N 38 43 1 15 

PEAT N 82 27 3 50 

PEBBLE BED REACTORS N 41 10 2 21 

PECLET NUMBER N 58 280 0 13 

PECULIAR GALAXIES N 15 196 0 8 

PECULIAR STARS N 22 805 2 9 

PEDALS N 6 17 0 7 

PEEK N 49 382 0 22 

PEELING N 96 101 1 72 

PEENING N 17 13 0 14 

PEGASUS AIR-LAUNCHED BOOSTER N 1 7 0 0 

PEGASUS COMPUTER N 2 1 0 2 

PEGASUS SATELLITES N 8 15 0 53 

PELAGIC ZONE N 26 10 4 15 

PELLETS N 349 266 5 193 

PELLICLE N 2 6 1 3 

PELOMYXA N 2 0 0 0 

PELTIER EFFECTS N 46 54 2 40 

PELVIS N 20 25 2 3 

PENALTIES N 53 109 8 48 

PENALTY FUNCTION N 56 282 1 7 

PENCIL BEAMS N 54 129 0 21 

PENDULUMS N 231 669 13 138 

PENEPLAINS N 0 0 1 0 

PENETRANTS N 34 81 9 26 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PENETRATION N 669 349 5 859 

PENETROMETERS N 60 22 1 37 

PENICILLIN N 10 15 6 18 

PENINSULAR RANGES (CA) N 5 0 0 0 

PENINSULAS N 27 18 3 15 

PENNING DISCHARGE N 61 171 0 11 

PENNING EFFECT N 31 114 0 14 

PENNING GAGES N 6 14 1 2 

PENNSYLVANIA N 269 71 47 180 

PENS N 10 5 0 10 

PENTABORANES N 14 5 0 16 

PENTANES N 67 57 2 31 

PENTANONE N 6 1 0 1 

PENTOBARBITAL N 2 8 0 7 

PENTOBARBITAL SODIUM N 3 9 0 2 

PENTODES N 3 14 1 11 

PENTOLITE N 10 2 0 24 

PENTOSE N 10 9 1 5 

PENUMBRAS N 45 261 0 14 

PEOLE SATELLITES N 3 1 0 0 

PEPPERS N 1 3 0 0 

PEPSIN N 3 8 0 4 

PEPTIDES N 149 281 101 212 

PERCEPTION N 367 80 147 244 

PERCEPTUAL ERRORS N 36 48 0 6 

PERCEPTUAL TIME CONSTANT N 11 70 6 5 

PERCHLORATE$ N 68 35 2 104 

PERCHLORIC ACID N 42 39 1 23 

PERCHLORYL FLUORIDES N 0 0 0 2 

PERCOLATION N 79 63 6 42 

PERCUS METHOD N 7 3 0 4 

PERCUSSION N 19 13 0 8 

PERFLUORO COMPOUNDS N 92 67 2 80 

PERFLUOROALKANE N 16 10 2 5 

PERFLUOROGUANIOINE N 0 0 0 10 

PERFORATED PLATES N 150 2270 7 66 

PERFORATED SHELLS N 30 467 8 16 

PERFORATING N 52 54 0 24 

PERFORATION N 13 57 0 18 

PERFORMANCE N 1341 596 74 1474 

PERFORMANCE PREDICTION N 5447 11711 77 4133 2

PERFORMANCE TESTS N 12197 10635 216 18374 4

PERICLASE N 3 10 0 5 

PERIDOTITE N 11 110 3 25 

PERIGEES N 107 230 0 109 

PERIHELIONS N 71 573 1 12 

PERILUNES N 2 0 0 8 

PERIOD DOUBLING N 20 202 0 0 

PERIODIC FUNCTIONS N 270 1680 32 113 

PERIODIC VARIATIONS N 2327 5539 60 1017 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PERIODICALS N 246 27 628 537 

PERIPHERAL CIRCULATION N 38 319 4 14 

PERIPHERAL EQUIPMENT (COMPUTERS) N 117 74 4 156 

PERIPHERAL JET FLOW N 27 50 0 12 

PERIPHERAL NERVOUS SYSTEM N 26 96 8 11 

PERIPHERAL VISION N 80 151 5 30 

PERISCOPES N 20 18 0 78 

PERITONEUM N 15 20 0 20 

PERMAFROST N 209 71 15 155 

PERMALLOYS (TRADEMARK) N 51 96 0 50 

PERMANENT MAGNETS N 70 73 0 44 

PERMANGANATES N 15 9 1 7 

PERMEABILITY N 907 452 44 720 

PERMEATING N 105 73 10 65 

PERMISSIVITY N 4 3 0 0 

PERMITTIVITY N 458 1638 8 188 

PERMUTATIONS N 185 110 34 105 

PEROVSKITES N 97 295 5 34 

PEROXIDES N 178 157 17 100 

PERSEID METEOROIDS N 8 124 0 10 

PERSHING MISSILE N 14 8 0 124 

PERSIAN GULF N 9 9 3 14 

PERSONAL COMPUTERS N 301 256 192 66 

PERSONALITY N 118 137 128 73 

PERSONALITY TESTS N 78 113 21 40 

PERSONNEL N 948 106 666 2298 

PERSONNEL DEVELOPMENT N 317 128 373 370 

PERSONNEL MANAGEMENT N 561 172 1193 599 

PERSONNEL SELECTION N 358 326 259 337 

PERSONNEL SUBSYSTEMS N 21 31 3 21 

PERSPEX (TRADEMARK) N 6 28 0 3 

PERSPIRATION N 99 157 4 54 

PERT N 81 43 48 154 

PERTURBATION N 2123 875 118 1019 

PERTURBATION THEORY N 2905 11243 243 1007 1

PERU N 90 68 12 73 

PERVEANCE N 12 46 0 6 

PESTICIDES N 134 35 109 162 

PETALS N 1 1 0 5 

PETECHIA N 0 2 0 0 

PETN N 92 26 0 41 

PETREL SOUNDING ROCKET N 9 15 0 2 

PETRI NETS N 82 87 6 24 

PETROGRAPHY N 188 639 33 190 

PETROLEUM PRODUCTS N 243 43 57 256 

PETROLOGY N 480 1465 195 440 

PFAFF EQUATION N 5 20 6 3 

PH N 458 543 17 199 

PH FACTOR N 293 172 7 173 

PHANTASTRONS N 2 6 0 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM •••***""' TYPE STAR IAA NLN OTHER 

PHANTOM AIRCRAFT N 3 8 2 0 

PHARMACOLOGY N 285 610 389 399 

PHARYNX N 7 8 5 3 

PHASE CHANGE MATERIALS N 153 151 3 108 

PHASE COHERENCE N 133 557 2 39 

PHASE CONJUGATION N 81 613 2 43 

PHASE CONTRAST N 43 94 3 20 

PHASE CONTROL N 220 765 4 159 

PHASE DEMODULATORS N 48 128 1 13 

PHASE DETECTORS N 178 589 4 141 

PHASE DEVIATION N 115 1280 0 45 

PHASE DIAGRAMS N 1128 3133 100 483 

PHASE ERROR N 201 1178 0 86 

PHASE LOCK DEMODULATORS N 35 72 1 21 

PHASE LOCKED SYSTEMS N 611 1668 20 331 

PHASE MATCHING N 47 229 0 14 

PHASE MODULATION N 517 1878 12 352 

PHASE RULE N 16 15 58 4 

PHASE SEPARATION (MATERIALS) N 225 209 0 38 

PHASE SHIFT N 1327 4910 22 794 

PHASE SHIFT CIRCUITS N 249 728 1 302 

PHASE SHIFT KEYING N 361 1933 4 135 

PHASE SWITCHING INTERFEROMETERS N 20 35 0 9 

PHASE TRANSFORMATIONS N 3586 7128 276 1466 1

PHASE VELOCITY N 342 2065 0 143 

PHASE-SPACE INTEGRAL N 124 298 3 29 

PHASED ARRAYS N 961 2351 28 1456 

PHASES N 37 42 6 121 

PHENANTHRENE N 33 8 1 8 

PHENOBARBITAL N 8 5 0 4 

PHENOL FORMALDEHYDE N 22 48 2 17 

PHENOLIC EPOXY RESINS N 17 14 0 18 

PHENOLIC RESINS N 192 301 26 495 

PHENOLOGY N 145 45 6 15 

PHENOLS N 224 112 24 256 

PHENOMENOLOGY N 129 335 33 86 

PHENDTHIAZINES N 3 6 0 2 

PHENYLALANINE N 12 34 0 6 

PHENYLS N 222 101 3 156 

PHILCO 2000 COMPUTER N 1 0 0 1 

PHILIPPINES N 65 44 10 93 

PHILIPS IONIZATION GAGES N 1 5 0 1 

PHILOSOPHY N 125 88 443 87 

PHLOROGLUCINOL N 3 0 0 2 

PHOBIAS N 0 9 2 0 

PHOBOS N 77 312 5 60 

PHOEBE N 6 26 0 0 

PHOEBUS NUCLEAR REACTOR N 16 8 0 114 

PHOENIX ( AZ) N 9 14 0 1 

PHOENIX QUADRANGLE ( AZ) N 12 0 0 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PHOENIX SOUNDING ROCKET N 3 2 0 29 

PHONEMES N 122 23 1 39 

PHONEMICS N 32 3 1 19 

PHONETICS N 187 22 13 74 

PHONOARTERIOGRAPHY N 3 8 0 0 

PHONOC~RDIOGRAPHY N 24 114 4 1 1 

PHONON BEAMS N 38 37 2 18 

PHONONS N 880 810 75 318 

PHORIA N 3 2 0 0 

PHOSGENE N 16 5 0 14 

PHOSPHATES N 417 550 46 429 

PHOSPHAZENE N 55 9 0 29 

PHOSPHENE N 5 13 2 0 

PHOSPHIOES N 93 141 1 61 

PHOSPHINES N 137 89 4 72 

PHOSPHONITRILES N 21 4 1 17 

PHOSPHONIUM COMPOUNDS N 16 0 1 10 

PHOSPHORESCENCE N 173 59 25 85 

PHOSPHORIC ACID N 223 142 5 197 

PHOSPHORIC ACID FUEL CELLS N 95 34 0 44 

PHOSPHORS N 209 121 11 122 

PHOSPHORUS N 611 496 39 402 

PHOSPHORUS COMPOUNDS N 233 176 21 151 

PHOSPHORUS ISOTOPES N 30 10 1 10 

PHOSPHORUS METABOLISM N 25 84 3 7 

PHOSPHORUS OXIDES N 27 52 0 11 

PHOSPHORUS POLYMERS N 19 10 2 22 

PHOSPHORUS 32 N 26 12 0 10 

PHOSPHORYLATION N 47 131 17 41 

PHOTICS N 9 24 11 7 

PHOTO RECONNAISSANCE SPACECRAFT N 0 5 0 2 

PHOTOABSORPTION N 169 1758 11 40 

PHOTOACOUSTIC MICROSCOPY N 14 22 0 3 

PHOTOACOUSTIC SPECTROSCOPY N 98 112 4 37 

PHOTOCATHODES N 300 507 5 654 

PHOTOCHEMICAL OXIDANTS N 116 58 7 52 

PHOTOCHEMICAL REACTIONS N 1817 2524 283 1155 

PHOTOCHROMISM N 86 114 7 99 

PHOTOCONDUCTIVE CELLS N 25 36 3 23 

PHOTOCONDUCTIVITY N 579 927 49 358 

PHOTOCONDUCTORS N 271 544 24 281 

PHOTODECOMPOSITION N 130 154 8 79 

PHOTODETACHMENT N 48 100 1 17 

PHOTODIODES N 647 1592 22 575 

PHOTODISSOCIATION N 491 1483 7 230 

PHOTOELASTIC ANALYSIS N 212 1402 34 87 

PHOTOELASTIC MATERIALS N 33 125 2 16 

PHOTOELASTICITY N 193 400 47 96 

PHOTOELECTRIC CELLS N 281 399 30 283 

PHOTOELECTRIC EFFECT N 197 447 22 226 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PHOTOELECTRIC EMISSION N 680 1159 43 370 

PHOTOELECTRIC GENERATORS N 49 64 7 29 

PHOTOELECTRIC MATERIALS N 101 234 11 98 

PHOTOELECTRICITY N 283 445 85 300 

PHOTOELECTROCHEMICAL DEVICES N 63 385 2 15 

PHOTOELECTROCHEMISTRY N 59 98 5 36 

PHOTOELECTROMAGNETIC EFFECTS N 16 32 2 7 

PHOTOELECTRON SPECTROSCOPY N 324 504 21 88 

PHOTOELECTRONS N 368 1024 29 169 

PHOTOENGRAVING N 22 17 5 42 

PHOTOGEOLOGY N 455 1108 27 213 

PHOTOGONIOMETERS N 11 11 1 3 

PHOTOGRAMMETRY N 941 1683 268 647 

PHOTOGRAPHIC DEVELOPERS N 51 66 9 128 

PHOTOGRAPHIC EMULSIONS N 237 544 26 167 

PHOTOGRAPHIC EQUIPMENT N 275 317 63 433 

PHOTOGRAPHIC FILM N 607 994 56 643 

PHOTOGRAPHIC MEASUREMENT N 285 918 19 210 

PHOTOGRAPHIC PLATES N 146 1172 10 50 

PHOTOGRAPHIC PROCESSING N 281 325 69 242 

PHOTOGRAPHIC PROCESSING EQUIPMENT N 57 28 10 100 

PHOTOGRAPHIC RECORDING N 658 2453 26 513 

PHOTOGRAPHIC RECTIFIERS N 3 16 1 6 

PHOTOGRAPHIC TRACKING N 127 223 1 68 

PHOTOGRAPHS N 491 237 170 654 

PHOTOGRAPHY N 492 253 310 759 

PHOTOINTERPRETATION N 2576 3747 95 790 

PHOTOIONIZATION N 686 2615 31 271 

PHOTOLITHOGRAPHY N 175 227 26 112 

PHOTOLUMINESCENCE N 370 909 21 172 

PHOTOLUMINESCENT BANDS N 23 59 0 11 

PHOTOLYSIS N 593 1029 19 381 

PHOTOMAGNETIC EFFECTS N 10 34 1 5 

PHOTOMAPPING N 706 2759 70 184 

PHOTOMAPS N 61 60 3 27 

PHOTOMASKS N 61 43 4 32 

PHOTOMECHANICAL EFFECT N 19 37 6 10 

PHOTOMETERS N 1010 1578 41 898 

PHOTOMETRY N 850 795 135 589 

PHOTOMICROGRAPHS N 105 597 4 111 

PHOTOMICROGRAPHY N 275 722 52 209 

PHOTOMULTIPLIER TUBES N 860 1390 14 646 

PHOTON ABSORPTIOMETRY N 32 54 0 12 

PHOTON BEAMS N 253 329 8 92 

PHOTON DENSITY N 124 442 0 35 

PHOTON-ELECTRON INTERACTION N 146 277 2 48 

PHOTONEUTRONS N 54 11 2 14 

PHOTONIC PROPULSION N 10 30 1 18 

PHOTONICS N 41 336 35 22 

PHOTONS N 1937 2613 108 923 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PHOTONUCLEAR REACTIONS N 84 42 17 25 

PHOTOOX I OA TI ON N 104 165 11 60 

PHOTOPEAK N 38 44 1 8 

PHOTOPHILIC PLANTS N 2 3 0 3 

PHOTDPHORESIS N 3 17 0 1 

PHOTOPLASTICITY N 25 60 3 12 

PHOTDPRODUCTION N 314 49 10 86 

PHOTORECEPTORS N 59 307 10 53 

PHOTORECONNAISSANCE N 77 157 17 236 

PHOTOSENSITIVITY N 370 1299 24 302 

PHOTOSPHERE N 437 2995 6 160 

PHOTDSTRESSES N 10 18 0 6 

PHOTOSYNTHESIS N 585 603 121 347 

PHOTOTHERMAL CONVERSION N 129 217 3 46 

PHOTOTRANSISTORS N 50 132 8 48 

PHOTOTROPISM N 35 42 3 18 

PHOTOTUBES N 33 32 2 38 

PHOTOVISCOELASTICITY N 6 29 0 7 

PHOTOVOLTAGES N 80 131 6 42 

PHOTOVOLTAIC CELLS N 1688 1774 97 748 

PHOTOVDLTAIC CONVERSION N 568 1542 66 268 

PHOTOVOLTAIC EFFECT N 439 347 16 285 

PHREATOPHYTE S N 3 0 6 1 

PHTHALATES N 77 37 2 53 

PHTHALOCYANIN N 92 90 1 40 

PHYLLOQUINONE N 3 4 1 0 

PHYSICAL CHEMISTRY N 372 376 720 433 

PHYSICAL EXAMINATIONS N 125 163 9 43 

PHYSICAL EXERCISE N 651 2031 107 280 

PHYSICAL FACTORS N 70 77 33 47 

PHYSICAL FITNESS N 356 366 72 176 

PHYSICAL OPTICS N 123 686 89 64 

PHYSICAL PROPERTIES N 1880 2326 262 1644 

PHYSICAL SCIENCES N 103 21 92 112 

PHYSICAL WORK N 226 565 36 103 

PHYSICIANS N 20 25 58 36 

PHYSICS N 157 115 1214 361 

PHYSICS AND CHEMISTRY EXPERIMENT IN SPACE N 1 1 8 0 14 

PHYSIOCHEMISTRY N 159 937 102 211 

PHYSIOLOGICAL ACCELERATION N 30 120 4 26 

PHYSIOLOGICAL DEFENSES N 28 164 11 29 

PHYSIOLOGICAL EFFECTS N 2862 2744 830 1590 

PHYSIOLOGICAL FACTORS N 310 356 107 220 

PHYSIOLOGICAL RESPONSES N 1473 4373 82 768 

PHYSIOLOGICAL TESTS N 432 2309 49 210 

PHYSIOLOGY N 471 193 937 768 

PHYTOPLANKTON N 204 199 44 98 

PHYTOTRONS N 15 35 3 11 

PI-ELECTRONS N 32 25 0 12 

PIAGGIO AIRCRAFT N 7 0 0 1 
NASA COMBINED FILE POSTING STAT! STICS 

910117 

******* SUBJECT TERM **-***** TYPE STAR IAA NLN OTHER 

PIASECKI AIRCRAFT N 1 1 0 1 

PICKLING (METALLURGY) N 15 10 0 7 

PICOSECOND PULSES N 162 1238 15 50 

PI CRATES N 5 4 0 6 

PICTURE TUBES N 33 27 3 29 

PIEDMONTS N 19 6 5 11 

PIERCING N 20 20 0 25 

PIEZOELECTRIC CERAMICS N 62 125 2 27 

PIEZOELECTRIC CRYSTALS N 345 549 20 267 

PIEZOELECTRIC GAGES N 110 11 1 1 70 

PIEZOELECTRIC TRANSDUCERS N 516 1096 12 376 

PIEZOELECTRICITY N 446 467 39 274 

PIEZOMETERS N 16 22 0 14 

PIEZORESISTIVE TRANSDUCERS N 45 81 0 40 

PIGEONS N 30 36 2 20 

PIGGYBACK SYSTEMS N 15 43 0 30 

PIGMENTS N 195 219 38 190 

PIKE'S PEAK (CO) N 0 3 0 1 

PILE FOUNDATIONS N 56 3 11 63 

PILES N 5 4 1 2 

PILLOWS N 0 1 0 0 

PILOCARPINE N 0 3 0 0 

PILOT ERROR N 335 404 13 102 

PILOT INDUCED OSCILLATION N 22 43 0 5 

PILOT PERFORMANCE N 2348 3039 76 932 

PILOT PLANTS N 624 464 11 775 

PILOT SELECTION N 244 373 8 77 

PILOT TRAINING N 710 1298 95 456 

PILOTLESS AIRCRAFT N 31 72 3 28 

PILOTS N 40 57 7 46 

PILOTS (PERSONNEL) N 514 165 66 370 

PINCH EFFECT N 251 141 6 90 

PINEAL GLAND N 3 33 6 10 

PINHOLE CAMERAS N 29 18 0 9 

PINHOLE OCCULTER FACILITY N 19 11 0 6 

PINHOLES N 51 90 1 43 

PINNING N 22 33 0 1 

PINS N 159 159 2 195 

PINTLES N 3 3 0 23 

PION BEAMS N 83 44 3 47 

PIONEER PROJECT N 42 41 3 72 

PIONEER SPACE PROBES N 199 255 13 211 

PIONEER VENUS SPACECRAFT N 119 388 3 126 

PIONEER VENUS 1 SPACECRAFT N 51 268 0 17 

PIONEER VENUS 2 ENTRY PROBES N 4 5 0 1 

PIONEER VENUS 2 NIGHT PROBE N 1 0 0 0 

PIONEER VENUS 2 SOUNDER PROBE N 2 6 0 0 

PIONEER VENUS 2 SPACECRAFT N 7 23 1 8 

PIONEER VENUS 2 TRANSPORTER BUS N 1 2 0 0 

PIONEER 1 SPACE PROBE N 1 1 0 4 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PIONEER 10 SPACE PROBE N 120 455 3 126 

PIONEER 11 SPACE PROBE N 98 335 3 96 

PIONEER 2 SPACE PROBE N 1 4 0 0 

PIONEER 3 SPACE PROBE N 0 0 0 4 

PIONEER 4 SPACE PROBE N 2 0 0 6 

PIONEER 5 SPACE PROBE N 3 0 0 8 

PIONEER 6 SPACE PROBE N 54 77 1 17 

PIONEER 7 SPACE PROBE N 31 37 0 16 

PIONEER 8 SPACE PROBE N 37 66 0 31 

PIONEER 9 SPACE PROBE N 27 54 0 29 

PIONS N 1655 566 21 393 

PIPE FLOW N 957 2818 70 287 

PIPE NOZZLES N 19 9 0 13 

PIPELINES N 484 324 139 539 

PIPELINING (COMPUTERS) N 190 468 2 42 

PIPER AIRCRAFT N 32 22 1 16 

PIPERIDINE N 6 3 0 2 

PIPES (TUBES) N 2338 1214 218 1874 

PIPETTES N 6 3 1 4 

PIRANI GAGES N 5 9 1 4 

PISTON ENGINES N 286 413 36 195 

PISTON THEORY N 48 400 1 17 

PISTONS N 374 293 8 355 

PITCH N 92 116 1 49 

PITCH (INCLINATION) N 965 1521 3 805 

PITCH (MATERIAL) N 45 51 0 118 

PITCHING MOMENTS N 569 796 3 459 

PITOT TUBES N 297 464 4 218 

PITS N 1 13 0 8 

PITS (EXCAVATIONS) N 9 11 0 6 

PITTING N 282 245 4 139 

PITUITARY GLAND N 45 116 18 69 

PITUITARY HORMONES N 29 71 25 65 

PIVOTS N 107 97 1 87 

PIXELS N 167 822 0 30 

PL/1 N 73 33 55 29 

PLAINS N 76 104 7 34 

PLAN POSITION INDICATORS N 34 81 1 41 

PLANAR STRUCTURES N 644 1481 26 531 

PLANCKS CONSTANT N 68 248 5 27 

PLANE STRAIN N 175 1140 5 50 

PLANE STRESS N 382 1042 0 24 

PLANE WAVES N 814 5277 33 295 

PLANET EPHEMERIDES N 68 430 24 37 

PLANETARIUMS N 11 8 3 7 

PLANETARY ATMOSPHERES N 943 2232 98 1418 

PLANETARY BASES N 17 46 3 11 

PLANETARY BOUNDARY LAYER N 119 556 3 38 

PLANETARY COMPOSITION N 236 1010 30 272 

PLANETARY CORES N 38 172 4 32 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PLANETARY CRATERS N 57 292 2 27 

PLANETARY CRUSTS N 45 129 0 32 

PLANETARY ENVIRONMENTS N 170 205 47 281 

PLANETARY EVOLUTION N 640 2958 115 502 

PLANETARY GEOLOGY N 221 404 25 186 

PLANETARY GRAVITATION N 112 881 9 54 

PLANETARY IONOSPHERES N 156 786 0 162 

PLANETARY LANDING N 107 221 6 72 

PLANETARY LIMB N 17 31 0 9 

PLANETARY MAGNETIC FIELDS N 258 1108 11 129 

PLANETARY MAGNETOSPHERES N 201 949 16 77 

PLANETARY MAGNETOTAILS N 2 14 0 0 

PLANETARY MANTLES N 46 146 1 32 

PLANETARY MAPPING N 138 423 6 77 

PLANETARY MASS N 85 589 10 46 

PLANETARY METEOROLOGY N 48 195 0 23 

PLANETARY NEBULAE N 226 2256 19 109 

PLANETARY ORBITS N 178 1086 25 109 

PLANETARY QUAKES N 7 6 0 4 

PLANETARY QUARANTINE N 125 77 14 98 

PLANETARY RADIATION N 154 1487 8 119 

PLANETARY RINGS N 60 160 2 36 

PLANETARY ROTATION N 126 1097 11 54 

PLANETARY STRUCTURE N 105 661 24 115 

PLANETARY SURFACES N 442 1255 39 540 

PLANETARY SYSTEMS N 22 269 0 16 

PLANETARY TEMPERATURE N 80 553 10 59 

PLANETARY WAVES N 290 1020 4 111 

PLANETOCENTRIC COORDINATES N 24 102 4 12 

PLANETOLOGY N 174 1387 75 244 

PLANETS N 275 278 430 742 

PLANFORMS N 82 67 1 52 

PLANING N 14 5 3 5 

PLANISPHERES N 0 7 1 1 

PLANKTON N 393 192 54 336 

PLANNING N 988 121 285 1675 

PLANOTRONS N 12 14 0 28 

PLANS N 3 5 2 32 

PLANT DESIGN N 211 39 17 217 

PLANT DISEASES N 121 98 0 11 

PLANT ROOTS N 89 83 15 52 

PLANT STRESS N 121 218 6 43 

PLANTAR TISSUES N 1 4 1 0 

PLANTING N 41 6 10 21 

PLANTS (BOTANY) N 1355 607 572 914 

PLASMA ACCELERATION N 178 642 4 79 

PLASMA ACCELERATORS N 244 524 3 144 

PLASMA ANTENNAS N 9 62 0 9 

PLASMA ARC CUTTING N 8 6 2 5 

PLASMA ARC WELDING N 75 139 7 83 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM  -** * TYPE STAR IAA NLN OTHER 

PLASMA BUBBLES N 14 58 0 1 

PLASMA CHEMISTRY N 66 265 29 44 

PLASMA CLOUDS N 177 488 5 80 

PLASMA COMPOSITION N 121 836 3 54 

PLASMA COMPRESSION N 95 183 0 40 

PLASMA CONDUCTIVITY N 268 1577 5 85 

PLASMA CONTROL N 2000 3705 32 398 

PLASMA COOLING N 22 72 0 9 

PLASMA CORE REACTORS N 22 25 0 1 

PLASMA CURRENTS N 409 846 2 77 

PLASMA CYLINDERS N 169 2005 3 33 

PLASMA DECAY N 144 725 1 31 

PLASMA DENSITY N 1493 6468 9 386 

PLASMA DIAGNOSTICS N 2044 6511 79 504 

PLASMA DIFFUSION N 303 1750 5 80 

PLASMA DIODES N 59 196 3 34 

PLASMA DISPLAY DEVICES N 17 42 4 13 

PLASMA DRIFT N 238 639 1 44 

PLASMA DYNAMICS N 982 3355 72 352 

PLASMA ELECTRODES N 93 1266 5 66 

PLASMA ENGINES N 123 328 5 71 

PLASMA EQUILIBRIUM N 325 890 3 71 

PLASMA ETCHING N 38 55 5 28 

PLASMA FLUX MEASUREMENT N 114 180 0 32 

PLASMA FOCUS N 133 182 2 26 

PLASMA FREQUENCIES N 277 2520 2 121 

PLASMA GENERATORS N 728 1359 19 305 

PLASMA GUNS N 150 192 2 63 

PLASMA HEATING N 1689 4382 45 419 

PLASMA INTERACTION EXPERIMENT N 12 90 0 11 

PLASMA INTERACTIONS N 807 2296 33 334 

PLASMA JET SYNTHESIS N 5 28 0 6 

PLASMA JET WIND TUNNELS N 50 74 0 14 

PLASMA JETS N 815 3322 25 344 

PLASMA LAYERS N 255 2072 6 92 

PLASMA LIFETIME N 40 156 0 9 

PLASMA LOSS N 101 356 1 20 

PLASMA OSCILLATIONS N 812 4343 22 250 

PLASMA PHYSICS N 2631 3369 293 1379 

PLASMA PINCH N 453 814 8 94 

PLASMA POTENTIALS N 231 1101 0 44 

PLASMA POWER SOURCES N 99 55 3 64 

PLASMA PRESSURE N 104 279 0 5 

PLASMA PROBES N 250 1256 9 110 

PLASMA PROPULSION N 163 420 15 63 

PLASMA PUMPING N 48 195 0 17 

PLASMA RADIATION N 263 2187 23 183 

PLASMA RESONANCE N 304 2334 13 102 

PLASMA SHEATHS N 571 905 15 397 

PLASMA SLABS N 87 371 2 18 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *** .. *** TYPE STAR IAA NLN OTHER 

PLASMA SPECTRA N 193 2299 18 82 

PLASMA SPRAYING N 307 926 14 229 

PLASMA TEMPERATURE N 529 3133 3 143 

PLASMA TORCHES N 22 53 0 10 

PLASMA TURBULENCE N 536 2922 24 154 

PLASMA WAVES N 1149 6103 72 383 

PLASMA-ELECTROMAGNETIC INTERACTION N 703 5837 14 171 

PLASMA-PARTICLE INTERACTIONS N 426 4054 8 129 

PLASMADYNAMIC LASERS N 7 92 3 5 

PLASMAGUIDES N 64 548 2 23 

PLASMAPAUSE N 141 794 3 51 

PLASMAS (PHYSICS) N 3660 708 333 2139 

PLASMA SPHERE N 144 456 4 83 

PLASMATRONS N 58 333 4 28 

PLASMOLYSIS N 7 4 0 4 

PLASMONS N 207 560 6 54 

PLASTERS N 15 10 8 10 

PLASTIC AIRCRAFT STRUCTURES N 23 446 3 17 

PLASTIC ANISOTROPY N 34 228 2 17 

PLASTIC BODIES N 97 281 0 12 

PLASTIC COATINGS N 246 253 40 349 

PLASTIC DEFORMATION N 2311 10136 130 935 1

PLASTIC FLOW N 343 1270 20 128 

PLASTIC MEMORY N 60 249 5 25 

PLASTIC PLATES N 37 132 0 2 

PLASTIC PROPELLANTS N 42 79 2 140 

PLASTIC PROPERTIES N 1447 2157 247 695 

PLASTIC SHELLS N 71 275 0 11 

PLASTIC TAPES N 27 27 0 52 

PLASTICIZERS N 173 89 20 505 

PLASTICS N 1364 941 670 1952 

PLASTISOLS N 4 15 2 21 

PLAT SYSTEM N 0 0 0 2 

PLATE THEORY N 166 4746 30 42 

PLATEAUS N 79 84 2 44 

PLATELETS N 32 115 20 54 

PLATENS N 8 4 0 13 

PLATES N 143 98 9 88 

PLATES (STRUCTURAL MEMBERS) N 1040 1789 91 509 

PLATES (TECTONICS) N 301 500 31 173 

PLATFORMS N 72 92 3 111 

PLATING N 248 82 42 231 

PLATINUM N 896 552 20 472 

PLATINUM ALLOYS N 119 97 3 57 

PLATINUM BLACK N 11 9 0 14 

PLATINUM COMPOUNDS N 88 75 2 31 

PLATINUM ISOTOPES N 25 1 0 7 

PLATINUM OXIDES N 9 6 1 6 

PLAYAS N 50 5 2 6 

PLAYBACKS N 45 37 3 33 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *****'*'* TYPE STAR IAA NLN OTHER 

PLEIADES CLUSTER N 22 158 0 17 

PLENUM CHAMBERS N 99 124 1 71 

PLETHYSMOGRAPHY N 52 144 5 17 

PLEURAE N 2 25 2 3 

PLEUROTIN N 1 0 0 1 

PLOTS N 16 10 0 3 

PLOTTERS N 354 177 10 237 

PLOTTING N 730 165 17 527 

PLOWING N 17 2 1 8 

PLOWS N 2 0 0 4 

PLUG NOZZLES N 85 37 0 92 

PLUGGING N 53 23 1 48 

PLUGS N 81 55 0 84 

PLUM BROOK REACTOR N 21 6 0 35 

PLUMAGE N 1 0 0 1 

PLUMES N 1113 1482 18 1189 

PLUNGERS N 19 14 0 30 

PLUTO (PLANET) N 58 280 9 43 

PLUTO ATMOSPHERE N 1 22 0 1 

PLUTO REACTORS N 3 1 0 32 

PLUTONIUM N 523 43 31 271 

PLUTONIUM ALLOYS N 64 6 2 29 

PLUTONIUM COMPOUNDS N 143 6 3 50 

PLUTONIUM FLUORIDES N 22 0 0 0 

PLUTONIUM ISOTOPES N 139 59 2 65 

PLUTONIUM OXIDES N 398 14 3 121 

PLUTONIUM RECYCLE TEST REACTOR N 21 1 1 7 

PLUTONIUM 238 N 148 47 0 138 

PLUTONIUM 239 N 156 11 1 56 

PLUTONIUM 240 N 26 2 0 11 

PLUTONIUM 241 N 26 0 0 2 

PLUTONIUM 244 N 3 34 1 2 

PLY ORIENTATION N 124 786 0 66 

PLYWOOD N 35 25 6 36 

PNEUMATIC CIRCUITS N 27 93 4 26 

PNEUMATIC CONTROL N 101 242 40 183 

PNEUMATIC EQUIPMENT N 350 389 56 800 

PNEUMATIC PROBES N 23 38 1 13 

PNEUMATICS N 51 43 26 65 

PNEUMOGRAPHY N 9 60 1 8 

PNEUMONIA N 8 20 1 10 

PNEUMOTHORAX N 3 17 0 0 

POCKET MICE N 9 22 0 7 

PODS (EXTERNAL STORES) N 52 51 1 156 

POGO N 41 38 0 47 

POGO EFFECTS N 67 61 1 72 

POHLHAUSEN METHOD N 11 43 0 4 

POIKILOTHERMIA N 1 8 0 2 

POINCARE PROBLEM N 137 387 7 42 

POINCARE SPHERES N 25 134 0 18 
910117 

NASA 

******* SUBJECT TERM ******* 

POINT DEFECTS 

POINT IMPACT 

POINT SOURCES 

POINT SPREAD FUNCTIONS 

POINT TO POINT COMMUNICATION 

POINTING CONTROL SYSTEMS 

POINTS 

POINTS 

(MATHEMATICS) 

POISONING 

POISONING 

(REACTION INHIBITION) 

POISSON 

POISONS 

DENSITY FUNCTIONS 

POISSON EQUATION 

POISSON RATIO 

POLAR 

POLAND 

CAP ABSORPTION 

POLAR CAPS 

POLAR COORDINATES 

POLAR CUSPS 

POLAR GASES 

POLAR METEOROLOGY 

POLAR NAVIGATION 

POLAR ORBITS 

POLAR RADIO BLACKOUT 

POLAR REGIONS 

POLAR SUBSTORMS 

POLAR WANDERING (GEOLOGY) 

POLAR I METERS 

POLARIS 

POLARIMETRY 

A1 MISSILE 

POLARIS A2 MISSILE 

POLARIS A3 MISSILE 

POLARIS MISSILES 

POLAR I SCOPES 

POLAR I TONS 

POLARIZATION 

POLARIZATION 

POLARITY 

(CHARGE SEPARATION) 

POLARIZATION (SPIN ALIGNMENT) 

POLARIZATION (WAVES) 

POLARIZATION CHARACTERISTICS 

POLARIZED ELASTIC WAVES 

COMBINED 

POLARIZED ELECTROMAGNETIC RADIATION 

POLARIZED LIGHT 

POLARIZED RADIATION 

POL 

POLAROGRAPHY 

POLARIZERS 

ARONS 

POLES 

POLES 

(SUPPORTS) 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

356 

STAR 

21 

401 

65 

77 

433 

18 

461 

6 

51 

68 

131 

291 

132 

168 

375 

623 

523 

16 

20 

136 

14 

312 

6 

1155 

62 

28 

273 

237 

4 

0 

0 

10 

19 

424 

613 

222 

301 

1062 

671 

13 

232 

260 

213 

72 

189 

24 

19 

63 

STATISTICS 

IAA 

286 

32 

1638 

202 

277 

1393 

20 

504 

10 

19 

12 

631 

1840 

1889 

251 

143 

1398 

278 

620 

48 

357 

9 

606 

30 

3025 

508 

347 

954 

1488 

0 

0 

0 

59 

13 

365 

111 

80 

183 

723 

5144 

2292 

36 

1731 

1497 

268 

862 

93 

88 

120 

9 

39 

NLN 

3 

1 

5 

0 

22 

3 

14 

27 

3 

29 

22 

80 

4 

24 

1 

2 

2 

8 

2 

1 

8 

7 

2 

63 

5 

3 

3 

10 

0 

3 

4 

0 

0 

0 

10 

8 

18 

51 

24 

29 

3 

0 

49 

2 

8 

14 

49 

OTHER 

132 

28 

143 

37 

11 

242 

11 

153 

86 

28 

13 

208 

188 

160 

138 

35 

160 

62 

8 

8 

29 

75 

160 

3 

571 

3 

35 

152 

168 

20 

2 

17 

282 

18 

3 

344 

523 

138 

259 

188 

151 

0 

92 

129 

137 

60 

131 

14 

3 

23 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

POLICE N 42 16 63 48 

POLICIES N 1337 469 959 1661 

POLIOMYELITIS N 5 1 0 3 

POLISHING N 173 162 25 178 

POLITICS N 256 469 752 333 

POLLEN N 47 9 11 15 

POLLUTION N 190 45 221 269 

POLLUTION CONTROL N 2565 1594 571 1884 

POLLUTION MONITORING N 1965 2818 221 1184 

POLLUTION TRANSPORT N 673 597 37 405 

POLOIDAL FLUX N 155 103 0 29 

POLONIUM N 18 3 4 22 

POLONIUM COMPOUNDS N 2 0 0 3 

POLONIUM ISOTOPES N 17 8 0 22 

POLONIUM 208 N 0 0 0 2 

POLONIUM 209 N 0 0 0 1 

POLONIUM 210 N 39 18 0 60 

POLY ACETYLENE N 49 158 1 16 

POLY ACRYLONITRILE N 4 8 0 2 

POLYAMIDE RESINS N 284 262 21 418 

POLYATOMIC GASES N 23 204 4 15 

POLYATOMIC MOLECULES N 255 325 46 102 

POLYBENZIMIDAZOLE N 27 41 1 131 

POLYBROMINATED BIPHENYLS N 2 0 0 0 

POLYBUTADIENE N 200 121 2 312 

POLYBUTADIENE TETRANITRAMINE N 5 0 0 1 

POLYCARBONATES N 276 408 13 263 

POLYCHLORINATED BIPHENYLS N 25 8 1 6 

POLYCRYSTALS N 1256 3359 37 473 

POLYCYTHEMIA N 3 41 0 2 

POLYESTER RESINS N 179 332 18 228 

POLYESTERS N 211 262 32 209 

POLYETHER RESINS N 87 103 6 75 

POLYETHYLENE TEREPHTHALATE N 89 85 2 32 

POLYETHYLENES N 904 585 31 544 

POLYGONIZATION N 10 72 0 5 

POLYGONS N 209 289 6 67 

POLYHEDRONS N 124 119 14 53 

POLYIMIDE RESINS N 315 441 3 349 

POLYIMIDES N 400 369 7 355 

POLYISOBUTYLENE N 26 11 2 30 

POLYISOPRENES N 33 15 0 17 

POLYMER BLENDS N 17 8 0 2 

POLYMER CHEMISTRY N 979 729 285 779 

POLYMER MATRIX COMPOSITES N 263 1238 21 203 

POLYMER PHYSICS N 332 1117 112 248 

POLYMERIC FILMS N 929 1050 43 616 

POLYMERIZATION N 1556 622 884 1304 

POLYMERS N 1636 1412 587 1513 

POLYMETHYL METHACRYLATE N 311 932 2 207 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM •***"'** TYPE STAR IAA NLN OTHER 

POLYMORPHISM N 86 159 12 50 

POLYNOMIALS N 2096 4056 202 833 

POLYNUCLEAR ORGANIC COMPOUNDS N 29 5 0 7 

POLYNUCLEOTIDES N 7 55 4 2 

POLYOT SATELLITES N 37 6 0 6 

POLYPEPTIDES N 38 72 8 11 

POLYPHENYL ETHER N 27 29 0 14 

POLYPHENYLS N 106 119 3 109 

POLYPROPYLENE N 224 223 15 168 

POLYQUINOXALINES N 38 15 1 50 

POLYSACCHARIDES N 60 32 16 61 

POLY SLIPS N 3 1 0 2 

POLYSTATION DOPPLER TRACKING SYSTEM N 22 43 0 7 

POLYSTYRENE N 509 387 19 242 

POLYSULFIDES N 57 84 1 53 

POLYTETRAFLUOROETHYLENE N 99 248 3 95 

POLYTOPES N 40 57 2 21 

POLYTROPIC PROCESSES N 23 528 4 15 

POLYURETHANE FOAM N 243 222 30 235 

POLYURETHANE RESINS N 404 239 28 501 

POLYVINYL ALCOHOL N 51 44 3 44 

POLYVINYL CHLORIDE N 217 233 34 183 

POLYVINYL FLUORIDE N 41 61 0 6 

POLYWATER N 9 7 1 1 

POMERANCHUK THEOREM N 23 7 0 9 

POMERONS N 29 3 0 9 

PONDEROMOTIVE FORCES N 80 507 1 19 

PONDS N 117 26 9 63 

PONTIAC (MI) N 1 0 0 0 

PONTRYAGIN PRINCIPLE N 143 539 11 40 

POPULATION INVERSION N 166 2063 4 106 

POPULATION THEORY N 326 327 31 86 

POPULATIONS N 547 323 231 283 

PORCELAIN N 23 13 10 19 

POROSITY N 1443 1203 48 920 

POROUS BOUNDARY LAYER CONTROL N 50 381 1 45 

POROUS MATERIALS N 1067 1492 46 657 

POROUS PLATES N 73 515 1 33 

POROUS WALLS N 111 915 1 52 

PORPHINE$ N 5 9 0 10 

PORPHYRA N 0 4 1 0 

PORPHYRINS N 106 80 17 43 

PORPOISES N 6 2 2 5 

PORTABLE EQUIPMENT N 860 609 18 1104 

PORTABLE LIFE SUPPORT SYSTEMS N 92 52 2 55 

PORTS N 9 19 7 12 

PORTS (OPENINGS) N 71 51 2 106 

PORTUGAL N 30 15 13 14 

PORTUGUESE SPACE PROGRAM N 0 0 0 0 

POSEIDON MISSILES N 8 14 0 1618 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

POSEIDON SATELLITE N 2 32 0 2 

POSITION N 11 11 2 6 

POSITION (LOCATION) N 2258 2410 84 1833 

POSITION (TITLE) N 10 2 46 8 

POSITION ERRORS N 413 2408 5 156 

POSITION INDICATORS N 327 397 11 323 

POSITION SENSING N 82 177 0 19 

POSITIONING N 422 399 7 270 

POSITIONING DEVICES (MACHINERY) N 139 121 1 122 

POSITIVE FEEDBACK N 37 229 4 17 

POSITIVE IONS N 71 1015 2 82 

POSITRON ANNIHILATION N 261 355 1 1 76 

POSITRONIUM N 73 84 4 14 

POSITRONS N 479 483 21 171 

POST BOOST PROPULSION SYSTEM N 6 5 0 81 

POST-BLAST NUCLEAR RADIATION N 16 5 4 33 

POSTAMPLI F I ERS N 2 4 0 6 

POSTERIOR SECTIONS N 2 11 0 2 

POSTFLIGHT ANALYSIS N 451 271 3 892 

POSTLAUNCH REPORTS N 25 26 1 45 

POSTMISSION ANALYSIS (SPACECRAFT) N 37 105 0 14 

POSTURE N 145 289 6 44 

POTABLE LIQUIDS N 0 2 0 1 

POTABLE WATER N 336 92 30 282 

POTASSIUM N 709 1054 15 564 

POTASSIUM ALLOYS N 28 15 0 16 

POTASSIUM BROMIDES N 57 66 1 33 

POTASSIUM CHLORIDES N 256 207 0 111 

POTASSIUM CHROMATES N 15 15 0 14 

POTASSIUM COMPOUNDS N 314 268 4 256 

POTASSIUM HYDRIDES N 2 6 0 0 

POTASSIUM HYDROXIDES N 133 118 0 82 

POTASSIUM IODIDES N 53 33 0 16 

POTASSIUM ISOTOPES N 31 72 0 7 

POTASSIUM NITRATES N 37 40 0 28 

POTASSIUM OXIDES N 33 55 0 12 

POTASSIUM PERCHLORATES N 36 40 0 30 

POTASSIUM PEROXIDES N 6 1 0 0 

POTASSIUM PHOSPHATES N 45 236 0 9 

POTASSIUM SILICATES N 17 6 0 33 

POTASSIUM 38 N 1 0 0 0 

POTASSIUM 39 N 3 1 0 0 

POTASSIUM 40 N 18 34 0 4 

POTATOES N 34 27 1 24 

POTENTIAL N 33 20 6 51 

POTENTIAL ENERGY N 792 2405 59 283 

POTENTIAL FIELDS N 146 690 5 29 

POTENTIAL FLOW N 881 3053 12 256 

POTENTIAL GRADIENTS N 112 298 0 35 

POTENTIAL THEORY N 605 1565 71 189 
NASA COMBINED FILE POSTING STATISTICS 

910117 

~****** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

POTENTIOMETERS N 20 24 1 38 

POTENTIOMETERS (INSTRUMENTS) N 124 100 8 122 

POTENTIOMETERS (RESISTORS) N 37 28 3 106 

POTENTIOMETRIC ANALYSIS N 129 61 13 72 

POTEZ AIRCRAFT N 1 0 0 0 

POTOMAC RIVER VALLEY (MD-VA-WV) N 20 11 9 21 

POTTING COMPOUNDS N 104 37 3 147 

POURING N 8 7 0 12 

POWDER (PARTICLES) N 765 823 50 573 

POWDER METALLURGY N 1218 3076 152 998 

POWDERED ALUMINUM N 138 260 2 161 

POWER N 41 37 50 98 

POWER AMPLIFIERS N 412 1154 27 775 

POWER BEAMING N 12 10 0 3 

POWER CONDITIONING N 746 1674 46 537 

POWER CONVERTERS N 71 237 5 53 

POWER EFFICIENCY N 722 4090 10 438 

POWER FACTOR CONTROLLERS N 41 35 1 9 

POWER GAIN N 238 4726 3 191 

POWER LIMITED SPACECRAFT N 15 10 1 7 

POWER LIMITERS N 39 61 0 56 

POWER LINES N 361 128 44 314 

POWER LOSS N 10 28 0 2 

POWER MODULES (STS) N 46 19 0 19 

POWER PLANTS N 254 360 51 209 

POWER REACTORS N 118 22 2 55 

POWER SERIES N 407 1122 48 158 

POWER SPECTRA N 2025 6197 20 920 

POWER SUPPLIES N 471 336 117 826 

POWER SUPPLY CIRCUITS N 477 660 27 614 

POWER TRANSMISSION N 101 349 13 97 

POWERED LIFT AIRCRAFT N 90 118 3 50 

POWERED MODELS N 8 3 0 4 

POYNTING THEOREM N 48 302 2 13 

POYNTING-ROBERTSON EFFECT N 26 116 0 3 

PRAESEPE STAR CLUSTERS N 7 11 0 3 

PRAETERSONIC DEVICES N 2 1 1 4 

PRANDTL NUMBER N 431 1827 6 157 

PRANOTL-MEYER EXPANSION N 52 151 3 19 

PRASEODYMIUM N 100 105 0 32 

PRASEODYMIUM ISOTOPES N 15 1 0 3 

PRE-IMBRIAN PERIOD N 2 18 0 0 

PRE-MAIN SEQUENCE STARS N 36 557 0 7 

PREAMPLIFIERS N 239 424 8 344 

PREBURNERS N 44 34 0 24 

PRECAMBRIAN PERIOD N 120 231 39 90 

PRECESSION N 168 1047 13 85 

PRECIPITATES N 371 906 0 39 

PRECIPITATION N 52 85 3 31 

PRECIPITATION (CHEMISTRY) N 798 392 33 406 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PRECIPITATION (METEOROLOGY) N 3193 2150 117 1449 

PRECIPITATION HARDENING N 501 3152 34 271 

PRECIPITATION PARTICLE MEASUREMENT N 191 657 7 61 

PRECIPITATORS N 20 10 1 11 

PRECISION N 703 396 51 634 

PRECISION GUIDED PROJECTILES N 10 39 0 11 

PRECONDITIONING N 58 89 1 17 

PRECOOLING N 5 10 0 11 

PREDATORS N 24 12 1 3 

PREDICTION ANALYSIS TECHNIQUES N 5012 3778 60 2311 1

PREDICTION RECORDING N 6 5 1 15 

PREDICTIONS N 3205 372 125 1541 

PREDICTOR-CORRECTOR METHODS N 148 329 0 6 

PREEMPTING N 6 3 0 2 

PREFIRING TESTS N 8 11 0 30 

PREFLIGHT ANALYSIS N 166 185 1 283 

PREFLIGHT OPERATIONS N 112 99 0 273 

PREFOCUSING N 5 0 0 1 

PREFORMS N 33 104 4 70 

PREGNANCY N 23 28 10 17 

PRE IMPREGNATION N 28 79 0 7 

PREJUDICES N 4 1 15 3 

PRELAUNCH PROBLEMS N 26 27 0 79 

PRELAUNCH SUMMARIES N 50 10 0 19 

PRELAUNCH TESTS N 135 188 2 312 

PREMATURE OPERATION N 3 4 0 2 

PREMIXED FLAMES N 237 1257 2 40 

PREMIXING N 44 22 0 11 

PREPARATION N 189 26 89 384 

PREPOLYMERS N 71 47 1 145 

PREPREGS N 132 541 3 108 

PREPROCESSING N 200 92 0 70 

PRESBYOPIA N 5 12 0 0 

PRESENTATION N 11 5 17 34 

PRESERVATIVES N 28 6 12 30 

PRESERVING N 89 11 34 96 

PRESIDENTIAL REPORTS N 51 7 97 41 

PRESSES N 32 37 20 91 

PRESSING N 8 26 0 12 

PRESSING (FORMING) N 180 238 15 222 

PRESSURE N 1155 139 63 1700 

PRESSURE BREATHING N 60 74 1 45 

PRESSURE BROADENING N 41 276 1 26 

PRESSURE CHAMBERS N 199 253 4 161 

PRESSURE DEPENDENCE N 238 575 1 102 

PRESSURE DISTRIBUTION N 5028 10550 36 3272 1

PRESSURE DRAG N 94 137 0 57 

PRESSURE DROP N 152 638 1 89 

PRESSURE EFFECTS N 2390 7997 58 1226 1

PRESSURE GAGES N 214 148 22 206 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******• SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PRESSURE GRADIENTS N 1969 3509 25 798 

PRESSURE HEADS N 50 69 3 45 

PRESSURE ICE N 21 9 0 15 

PRESSURE MEASUREMENT N 2269 2593 69 1523 

PRESSURE MODULATOR RADIOMETERS N 2 9 0 7 

PRESSURE OSCILLATIONS N 416 1380 6 287 

PRESSURE PULSES N 170 577 2 99 

PRESSURE RATIO N 166 209 0 137 

PRESSURE RECORDERS N 26 25 0 17 

PRESSURE RECOVERY N 103 335 1 153 

PRESSURE REDUCTION N 701 754 14 526 

PRESSURE REGULATORS N 197 171 6 501 

PRESSURE SENSORS N 874 1204 17 823 

PRESSURE SUITS N 175 171 4 168 

PRESSURE SWITCHES N 20 8 0 90 

PRESSURE VESSEL DESIGN N 76 142 18 63 

PRESSURE VESSELS N 1400 1160 212 1259 

PRESSURE WELDING N 50 59 4 42 

PRESSURIZED CABINS N 115 183 6 91 

PRESSURIZED WATER REACTORS N 190 13 6 54 

PRESSURIZING N 217 340 12 395 

PRESTRESSING N 216 942 23 154 

PRETREATMENT N 96 114 3 52 

PREVAPORIZATION N 8 10 0 4 

PREVENTION N 126 48 75 273 

PREWHIRLING N 1 2 0 1 

PREWHITENING N 4 1 0 0 

PRIBRAM METEORITE N 1 14 0 2 

PRIMARY BATTERIES N 154 100 9 156 

PRIMARY COSMIC RAYS N 206 1302 4 65 

PRIMATES N 113 93 66 152 

PRIMERS N 11 10 5 16 

PRIMERS (COATINGS) N 103 84 7 107 

PRIMERS (EXPLOSIVES) N 32 17 5 44 

PRIMING N 3 10 0 0 

PRIMITIVE EARTH ATMOSPHERE N 35 335 2 27 

PRIMITIVE EQUATIONS N 66 458 2 7 

PRINCE EDWARD ISLAND N 0 5 1 0 

PRINCE WILLIAM SOUND (AK) N 9 0 0 1 

PRINCIPAL COMPONENTS ANALYSIS N 44 143 0 7 

PRINCIPLES N 15 7 152 16 

PRINTED CIRCUITS N 691 674 91 916 

PRINTED RESISTORS N 7 19 0 13 

PRINTERS N 72 29 13 108 

PRINTERS (DATA PROCESSING) N 144 32 5 93 

PRINTING N 221 67 144 182 

PRINTOUTS N 182 21 6 246 

PRIORITIES N 135 89 33 66 

PRISMATIC BARS N 28 320 2 22 

PRISMS N 228 745 18 151 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PRIVACY N 45 23 18 15 

PROBABILITY DENSITY FUNCTIONS N 1459 2925 21 632 

PROBABILITY DISTRIBUTION FUNCTIONS N 1497 2537 65 481 

PROBABILITY THEORY N 3861 6093 1034 2178 1

PROBE METHOD (FORECASTING) N 13 4 0 4 

PROBES N 117 111 10 123 

PROBLEM SOLVING N 7009 1013 1231 2949 1

PROBLEMS N 17 5 39 40 

PROCEDURES N 740 97 483 719 

PROCESS CONTROL (INDUSTRY) N 1023 645 126 626 

PROCESS HEAT N 205 31 9 158 

PROCESSES N 29 8 23 61 

PROCESSING N 71 77 22 395 

PROCUREMENT N 255 85 83 716 

PROCUREMENT MANAGEMENT N 201 280 80 233 

PROCUREMENT POLICY N 144 49 26 93 

PRODUCT DEVELOPMENT N 4653 2013 258 5098 1

PRODUCTION N 110 21 40 184 

PRODUCTION COSTS N 200 279 5 253 

PRODUCTION ENGINEERING N 3500 2533 414 5006 1

PRODUCTION MANAGEMENT N 463 225 218 480 

PRODUCTION PLANNING N 273 172 51 278 

PRODUCTIVITY N 866 320 346 768 

PRODUCTS N 67 26 129 139 

PROFILE METHOD (FORECASTING) N 50 3 2 20 

PROFILES N 79 126 5 59 

PROFILOMETERS N 89 88 2 56 

PROGENY N 7 11 1 4 

PROGNOSIS N 36 72 3 9 

PROGNOZ SATELLITES N 50 264 0 21 

PROGRAM TREND LINE ANALYSIS N 17 14 4 13 

PROGRAM VERIFICATION (COMPUTERS) N 1601 398 49 512 

PROGRAMMED INSTRUCTION N 135 71 234 100 

PROGRAMMERS N 161 21 34 112 

PROGRAMMING N 25 72 67 24 

PROGRAMMING (SCHEDULING) N 47 73 9 37 

PROGRAMMING LANGUAGES N 2989 1008 855 1269 

PROGRAMS N 94 21 79 132 

PROGRESS N 123 12 200 114 

PROGRESSIONS N 13 15 0 7 

PROHIBITION N 2 2 4 7 

PROJECT MANAGEMENT N 2348 1350 310 2645 

PROJECT PLANNING N 1817 566 118 1603 

PROJECT SET I N 75 248 1 40 

PROJECTILE CRATERING N 93 172 1 49 

PROJECTILES N 862 480 15 1357 

PROJECTION N 36 205 6 43 

PROJECTIVE GEOMETRY N 158 229 44 79 

PROJECTORS N 95 129 6 117 

PROJECTS N 52 9 23 60 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM **"'  TYPE STAR IAA NLN OTHER 

PROKARYOTE$ N 12 43 1 1 

PROLATE SPHEROIDS N 53 272 2 13 

PROLATENESS N 5 25 0 0 

PROLOG (PROGRAMMING LANGUAGE) N 99 90 0 3 

PROLONGATION N 11 14 2 13 

PROMETHAZINE N 2 9 0 3 

PROMETHIUM N 22 14 0 14 

PROMETHIUM ISOTOPES N 38 7 0 24 

PROMINENCES N 15 14 1 5 

PROMOTION N 11 6 30 36 

PRONE POSITION N 9 29 0 2 

PRONY SERIES N 24 29 0 8 

PROP-FAN TECHNOLOGY N 156 287 0 62 

PROPAGATION N 113 49 9 73 

PROPAGATION (EXTENSION) N 26 10 3 12 

PROPAGATION MODES N 522 7000 15 188 

PROPAGATION VELOCITY N 362 4133 4 144 

PROPANE N 365 540 8 259 

PROPARGYL GROUPS N 3 0 0 0 

PROPELLANT ACTUATED DEVICES N 11 10 1 33 

PROPELLANT ACTUATED INSTRUMENTS N 5 4 1 27 

PROPELLANT ADDITIVES N 105 227 0 427 

PROPELLANT BINDERS N 149 181 2 736 

PROPELLANT CASTING N 29 38 0 78 

PROPELLANT CHEMISTRY N 111 202 7 916 

PROPELLANT COMBUSTION N 626 1165 17 1446 

PROPELLANT DECOMPOSITION N 110 286 1 225 

PROPELLANT EVAPORATION N 36 79 2 37 

PROPELLANT EXPLOSIONS N 22 17 0 38 

PROPELLANT GRAINS N 333 398 3 1110 

PROPELLANT MASS RATIO N 45 84 0 73 

PROPELLANT PROPERTIES N 205 358 13 1323 

PROPELLANT SENSITIVITY N 71 71 3 302 

PROPELLANT SPRAYS N 23 32 0 36 

PROPELLANT STORABILITY N 56 66 2 219 

PROPELLANT STORAGE N 222 244 3 426 

PROPELLANT TANKS N 426 566 2 1105 

PROPELLANT TESTS N 217 425 7 749 

PROPELLANT TRANSFER N 215 271 4 506 

PROPELLANTS N 302 103 35 986 

PROPELLER BLADES N 325 425 12 210 

PROPELLER DRIVE N 79 136 5 57 

PROPELLER EFFICIENCY N 151 179 7 105 

PROPELLER FANS N 117 131 2 50 

PROPELLER NOISE N 18 34 0 2 

PROPELLER SLIPSTREAMS N 74 103 6 49 

PROPELLERS N 521 423 89 449 

PROPERTIES N 29 8 21 70 

PROPHYLAXIS N 71 225 4 33 

PROPIONIC ACID N 13 4 0 8 
NASA COMBINED FILE POSTING STATISTICS 

910117 

** ***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PROPORTION N 28 11 5 3 

PROPORTIONAL CONTROL N 64 270 2 55 

PROPORTIONAL COUNTERS N 405 746 6 150 

PROPORTIONAL LIMIT N 37 88 3 27 

PROPRIOCEPTION N 66 135 8 21 

PROPRIOCEPTORS N 23 27 0 5 

PROPULSION N 304 112 93 778 

PROPULSION SYSTEM CONFIGURATIONS N 1498 1684 86 3125 

PROPULSION SYSTEM PERFORMANCE N 1544 3003 66 3144 

PROPULSIVE EFFICIENCY N 366 775 6 390 

PROPYL COMPOUNDS N 40 44 0 24 

PROPYL NITRATE N 2 3 0 5 

PROPYLENE N 117 111 8 89 

PROPYLENE OXIDE N 17 5 0 19 

PROSTAGLANDINS N 19 64 31 37 

PROSTATE GLAND N 5 2 3 2 

PROSTHETIC DEVICES N 192 76 31 123 

PROTACTINIUM N 12 1 0 7 

PROTACTINIUM COMPOUNDS N 3 0 0 1 

PROTACTINIUM FLUORIDES N 0 0 0 1 

PROTACTINIUM ISOTOPES N 17 3 0 5 

PROTEASE N 6 6 3 11 

PROTECTION N 386 74 111 815 

PROTECTIVE CLOTHING N 587 279 20 813 

PROTECTIVE COATINGS N 2182 2610 163 2511 

PROTECTORS N 48 13 4 81 

PROTEIN CRYSTAL GROWTH N 39 78 0 27 

PROTEIN METABOLISM N 152 406 45 62 

PROTEIN SYNTHESIS N 44 234 9 68 

PROTEINOIDS N 4 60 0 11 

PROTEINS N 614 711 382 709 

PROTHROMBIN N 2 12 0 1 

PROTOBIOLOGY N 3 209 9 7 

PROTOCOL (COMPUTERS) N 337 358 10 121 

PROTON BEAMS N 548 300 4 200 

PROTON BELTS N 43 200 0 11 

PROTON DAMAGE N 54 68 0 18 

PROTON DENSITY (CONCENTRATION) N 64 229 0 34 

PROTON ENERGY N 277 1548 1 99 

PROTON FLUX DENSITY N 182 1091 1 46 

PROTON IMPACT N 68 216 0 15 

PROTON IRRADIATION N 343 592 1 122 

PROTON MAGNETIC RESONANCE N 54 29 9 28 

PROTON MASERS N 3 13 0 1 

PROTON PRECESSION N 15 21 0 5 

PROTON PRECIPITATION N 64 405 1 13 

PROTON PROTUBERANCES N 8 17 0 2 

PROTON RESONANCE N 64 41 4 27 

PROTON SATELLITES N 10 44 0 8 

PROTON SCATTERING N 394 223 3 116 
NASA COMBINED FILE POSTING STATISTICS 

910117 

-1<****** SUBJECT TERM ***•*** TYPE STAR IAA NLN OTHER 

PROTON 1 SATELLITE N 7 17 1 5 

PROTON 2 SATELLITE N 4 30 0 1 

PROTON 3 SATELLITE N 0 18 0 0 

PROTON 4 SATELLITE N 4 25 0 0 

PROTON-PROTON REACTIONS N 201 111 0 80 

PROTONS N 2326 1025 52 856 

PROTOPLANETS N 86 497 1 30 

PROTOPLASM N 5 23 4 3 

PROTOPLASTS N 8 3 3 3 

PROTOPROTEINS N 0 11 1 0 

PROTOSTARS N 89 872 5 47 

PROTOTYPES N 1714 1554 6 1977 

PROTOZOA N 26 26 13 70 

PROTRACTORS N 2 4 0 9 

PROTUBERANCES N 65 67 1 98 

PROUSTITE N 14 24 1 0 

PROVING N 1329 153 32 991 

PROVISIONING N 17 10 1 20 

PROXIMITY N 80 91 3 58 

PROXIMITY EFFECT (ELECTRICITY) N 19 21 1 18 

PSEUDOMONAS N 22 19 0 31 

PSEUDONOISE N 41 240 0 61 

PSEUDOPOTENTIALS N 15 39 2 7 

PSEUDORANDOM SEQUENCES N 117 350 6 78 

PSYCHIATRY N 34 74 91 24 

PSYCHOACOUSTICS N 233 165 17 103 

PSYCHOLINGUISTICS N 11 8 21 8 

PSYCHOLOGICAL EFFECTS N 701 427 147 254 

PSYCHOLOGICAL FACTORS N 537 939 292 309 

PSYCHOLOGICAL SETS N 4 10 1 0 

PSYCHOLOGICAL TESTS N 383 753 46 234 

PSYCHOLOGY N 494 106 1046 443 

PSYCHOMETRICS N 214 216 61 121 

PSYCHOMOTOR PERFORMANCE N 405 541 20 173 

PSYCHOPHARMACOLOGY N 9 24 28 11 

PSYCHOPHYSICS N 175 562 23 111 

PSYCHOPHYSIOLOGY N 516 820 146 331 

PSYCHOSES N 5 26 7 10 

PSYCHOSOMATICS N 22 65 30 6 

PSYCHOTHERAPY N 27 41 75 16 

PSYCHOTIC DEPRESSION N 6 14 2 2 

PSYCHOTROPIC DRUGS N 3 26 12 12 

PSYCHROMETERS N 60 29 6 29 

PSYCHROPHILES N 4 6 0 4 

PTOLEMAEUS CRATER N 0 0 0 1 

PUBLIC ADDRESS SYSTEMS N 3 2 1 11 

PUBLIC HEALTH N 839 264 303 678 

PUBLIC LAW N 159 53 95 150 

PUBLIC RELATIONS N 141 62 140 147 

PUBLIC SPEAKING N 0 1 24 1 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PUERTO RICO N 68 65 29 54 

PULLEYS N 33 11 1 30 

PULLING N 30 36 1 85 

PULMONARY CIRCULATION N 128 436 19 50 

PULMONARY FUNCTIONS N 199 635 28 93 

PULMONARY LESIONS N 22 70 1 23 

PULSAR MAGNETOSPHERES N 47 309 0 10 

PULSARS N 630 4625 62 169 

PULSE AMPLITUDE N 524 1043 14 335 

PULSE AMPLITUDE MODULATION N 122 271 1 100 

PULSE CHARGING N 8 8 0 16 

PULSE CODE MODULATION N 550 1067 19 632 

PULSE COMMUNICATION N 694 2571 129 495 

PULSE COMPRESSION N 223 752 7 166 

PULSE DIFFRACTION N 24 56 2 10 

PULSE DOPPLER RADAR N 73 417 1 61 

PULSE DURATION N 827 3931 5 485 

PULSE DURATION MODULATION N 224 403 5 113 

PULSE FREQUENCY MODULATION N 107 257 2 94 

PULSE FREQUENCY MODULATION TELEMETRY N 31 24 3 20 

PULSE GENERATORS N 848 1119 36 1043 

PULSE HEATING N 64 344 4 60 

PULSE MODULATION N 318 647 28 351 

PULSE POSITION MODULATION N 74 184 4 37 

PULSE RADAR N 282 865 10 303 

PULSE RATE N 289 746 1 234 

PULSE REPETITION RATE N 114 282 0 58 

PULSE TIME MODULATION N 48 100 0 25 

PULSE WIDTH AMPLITUDE CONVERTERS N 26 38 0 10 

PULSED JET ENGINES N 29 117 1 34 

PULSED LASERS N 1596 8254 43 1362 1

PULSED RADIATION N 798 2342 42 465 

PULSEJET ENGINES N 17 46 2 24 

PULSES N 774 183 36 916 

PULTRUSION N 14 84 1 39 

PUMICE N 11 10 1 8 

PUMP IMPELLERS N 88 135 7 82 

PUMP SEALS N 54 46 1 37 

PUMPING N 68 606 6 67 

PUMPS N 604 320 94 762 

PUNCHED CARDS N 141 23 37 190 

PUNCHED TAPES N 87 48 3 98 

PUNCHES N 15 73 2 28 

PUPA N 6 10 1 3 

PUPIL SIZE N 22 36 0 10 

PUPILLOMETRY N 18 33 2 9 

PUPILS N 21 68 0 14 

PURGING N 65 20 0 116 

PURIFICATION N 506 185 153 573 

PURINES N 23 53 8 31 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

PURITY N 453 171 13 403 

PURPOSES N 6 0 2 4 

PURSUIT TRACKING N 82 510 3 33 

PUSH-PULL AMPLIFIERS N 28 72 1 31 

PUSHBROOM SENSOR MODES N 59 123 0 12 

PUSHING N 9 5 0 10 

PYCNOMETERS N 14 13 0 16 

PYLON MOUNTING N 17 18 0 44 

PYLONS N 104 91 0 131 

PYRAMID LAKE (NV) N 0 1 0 0 

PYRAMIDAL BODIES N 15 55 0 5 

PYRAMIDS N 33 50 3 14 

PYRANOMETERS N 92 126 0 42 

PYRAZINES N 17 3 0 10 

PYRENEES MOUNTAINS (EUROPE) N 22 14 0 0 

PYRENES N 31 30 1 14 

PYRIDINE NUCLEOTIDES N 5 10 2 3 

PYRIDINES N 210 76 9 130 

PYRIDOXINE N 10 22 1 4 

PYRIMIDINES N 31 60 8 32 

PYRITES N 73 57 5 49 

PYROCERAM (TRADEMARK) N 9 29 5 12 

PYROELECTRICITY N 155 306 21 114 

PYROGEN N 7 18 0 18 

PYROHE LI OMETERS N 66 87 2 21 

PYROHYDROLYSIS N 14 4 0 6 

PYROLYSIS N 1261 1532 71 1121 

PYROLYTIC GRAPHITE N 160 251 3 230 

PYROLYTIC MATERIALS N 122 76 5 128 

PYROMETALLURGY N 58 27 5 27 

PYROMETERS N 143 153 21 92 

PYROPHORIC MATERIALS N 32 10 5 91 

PYROPHYLLITE N 2 5 1 3 

PYROTECHNICS N 499 239 38 819 

PYROXENES N 76 913 2 48 

PYRRHOTITE N 7 13 0 3 

PYRROLES N 109 53 5 33 

PYRRONES (TRADEMARK) N 10 7 2 5 

PYRUVATES N 11 45 2 6 

Q DEVICES N 39 122 1 11 

Q FACTORS N 239 1393 4 96 

Q SWITCHED LASERS N 452 1994 8 299 

Q VALUES N 73 99 5 20 

QATAR N 0 7 2 0 

QH-50 HELICOPTER N 1 0 0 4 

QUADRANTID METEOROIDS N 4 64 0 3 

QUADRANTS N 41 26 6 12 

QUADRATIC EQUATIONS N 475 683 48 145 

QUADRATIC PROGRAMMING N 241 371 16 62 

QUADRATURES N 287 990 12 112 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ***-  TYPE STAR IAA NLN OTHER 

QUADRUPOLE NETWORKS N 22 227 0 9 

QUADRUPOLES N 598 879 15 193 

QUAIL MISSILE N 0 0 0 2 

QUALIFICATIONS N 258 96 33 626 

QUALITATIVE ANALYSIS N 305 266 82 248 

QUALITY N 315 73 44 654 

QUALITY CONTROL N 4300 3970 577 8108 1

QUANTILES N 67 9 1 1 

QUANTITATIVE ANALYSIS N 1264 751 167 722 

QUANTUM AMPLIFIERS N 22 135 1 15 

QUANTUM CHEMISTRY N 154 149 56 76 

QUANTUM CHROMODYNAMICS N 327 143 14 202 

QUANTUM COUNTERS N 66 183 2 25 

QUANTUM EFFICIENCY N 245 1269 1 73 

QUANTUM ELECTRODYNAMICS N 521 714 129 235 

QUANTUM ELECTRONICS N 202 202 22 169 

QUANTUM MECHANICS N 1684 2284 519 652 

QUANTUM NUMBERS N 243 475 9 81 

QUANTUM OPTICS N 25 294 16 4 

QUANTUM STATISTICS N 261 421 55 88 

QUANTUM THEORY N 1337 1852 801 612 

QUANTUM WELLS N 188 117 1 0 58 

QUARK MODELS N 8 10 0 3 

QUARK PARTON MODEL N 43 6 2 38 

QUARKS N 669 361 51 337 

QUARTIC EQUATIONS N 11 33 3 6 

QUARTILES N 2 3 0 1 

QUARTZ N 644 810 20 726 

QUARTZ CRYSTALS N 272 454 14 182 

QUARTZ LAMPS N 37 41 1 24 

QUARTZ TRANSDUCERS N 47 105 1 49 

QUARTZITE N 48 19 0 4 

QUASARS N 543 5568 61 238 

QUA SAT N 27 17 0 6 

QUASI-STEADY STATES N 119 457 2 47 

QUATERNARY ALLOYS N 53 381 6 22 

QUATERNIONS N 67 193 8 25 

QUEBEC N 6 54 2 4 

QUEFRENCIES N 0 1 0 0 

QUENCHING N 80 217 3 63 

QUENCHING (ATOMIC PHYSICS) N 130 319 1 42 

QUENCHING (COOLING) N 731 1374 17 366 

QUERY LANGUAGES N 113 32 1 12 

QUESTOL AIRCRAFT N 2 6 0 5 

QUEUEING THEORY N 995 408 99 411 

QUIET ENGINE PROGRAM N 132 74 1 45 

QUINOLINE N 37 17 1 34 

QUINOXALINES N 17 10 2 25 

QUOTIENTS N 25 37 1 7 

R CORONAE BOREALIS STARS N 16 118 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

** ***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

RA-28 ENGINE N 1 0 0 0 

RABBITS N 278 720 9 231 

RACAH COEFFICIENT N 11 4 3 2 

RACE FACTORS N 15 9 99 32 

RACES (ANTHROPOLOGY) N 9 3 110 11 

RACETRACKS (PARTICLE ACCELERATORS) N 24 7 1 13 

RACKS N 1 2 1 4 

RACKS (FRAMES) N 33 9 2 166 

RACKS (GEARS) N 7 3 0 2 

RADANT N 0 6 0 5 

RADAR N 714 183 232 1802 

RADAR ABSORBERS N 13 21 0 128 

RADAR ANTENNAS N 648 1748 13 1697 

RADAR APPROACH CONTROL N 96 114 5 117 

RADAR ASTRONOMY N 85 364 14 78 

RADAR ATTENUATION N 90 169 1 162 

RADAR BEACONS N 291 173 3 381 

RADAR BEAMS N 105 176 1 105 

RADAR CLUTTER MAPS N 84 55 0 147 

RADAR CORNER REFLECTORS N 46 62 0 51 

RADAR CROSS SECTIONS N 556 892 9 1938 

RADAR DATA N 412 1178 10 276 

RADAR DETECTION N 401 1499 23 611 

RADAR ECHOES N 1071 2218 13 1127 

RADAR EQUIPMENT N 900 1179 69 3326 

RADAR FILTERS N 61 490 2 54 

RADAR GEOLOGY N 80 66 2 14 

RADAR HOMING MISSILES N 12 58 0 79 

RADAR IMAGERY N 1312 2282 29 1292 

RADAR MAPS N 184 448 1 203 

RADAR MEASUREMENT N 726 3030 26 439 

RADAR NAVIGATION N 146 267 20 337 

RADAR NETWORKS N 58 60 1 44 

RADAR PHOTOGRAPHY N 71 112 2 52 

RADAR RANGE N 153 404 7 174 

RADAR RECEIVERS N 248 562 9 698 

RADAR RECEPTION N 69 144 4 52 

RADAR REFLECTORS N 75 100 0 162 

RADAR RESOLUTION N 193 538 4 90 

RADAR SCANNING N 238 571 9 267 

RADAR SCATTERING N 690 1499 8 421 

RADAR SIGNATURES N 419 250 3 1292 

RADAR TARGET SCATTER SITE PROGRAM N 3 2 0 15 

RADAR TARGETS N 594 1431 11 1116 

RADAR TRACKING N 1253 1790 38 3736 

RADAR TRANSMISSION N 258 487 14 297 

RADAR TRANSMITTERS N 136 301 4 444 

RADAR SAT N 14 45 0 13 

RADARSCOPES N 68 117 6 71 

RADIAL DISTRIBUTION N 339 2434 2 107 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ****-*-1<* TYPE STAR IAA NLN OTHER T

RADIAL FLOW N 346 920 6 146 

RADIAL VELOCITY N 330 5777 9 86 

RADIANCE N 701 1176 5 421 

RADIANCY N 12 4 0 7 

RADIANT COOLING N 94 631 2 56 

RADIANT FLUX DENSITY N 797 7675 17 534 9

RADIANT HEATING N 246 557 12 224 

RADIATION N 214 84 98 409 

RADIATION ABSORPTION N 940 1646 40 618 

RADIATION AND METEOROID SATELLITE N 1 0 0 1 

RADIATION BELTS N 480 1054 32 252 

RADIATION CHEMISTRY N 60 134 24 70 

RADIATION COUNTERS N 905 994 44 463 

RADIATION DAMAGE N 1747 1872 80 1833 

RADIATION DETECTORS N 1588 2221 73 969 4

RADIATION DISTRIBUTION N 735 4170 33 363 

RADIATION DOSAGE N 1963 1444 118 1129 

RADIATION EFFECTS N 4913 5161 463 3968 1

RADIATION HARDENING N 419 445 9 1572 

RADIATION HAZARDS N 1173 493 98 1180 

RADIATION INJURIES N 208 113 22 147 

RADIATION LAWS N 16 37 3 5 

RADIATION MEASUREMENT N 1397 2417 171 790 

RADIATION MEASURING INSTRUMENTS N 721 619 47 512 

RADIATION METEOROID SPACECRAFT N 5 0 0 2 

RADIATION PRESSURE N 309 1494 5 94 

RADIATION PROTECTION N 635 527 150 655 

RADIATION PYROMETERS N 50 71 1 34 

RADIATION SHIELDING N 1190 617 58 1108 

RADIATION SICKNESS N 98 111 5 56 

RADIATION SOURCES N 835 2291 40 467 

RADIATION SPECTRA N 363 869 24 292 

RADIATION THERAPY N 130 58 43 65 

RADIATION TOLERANCE N 545 772 7 339 

RADIATION TRANSPORT N 137 158 4 41 

RADIATION TRAPPING N 19 52 0 16 

RADIATIVE HEAT TRANSFER N 1053 3685 71 532 

RADIATIVE LIFETIME N 102 665 3 38 

RADIATIVE RECOMBINATION N 99 807 8 44 

RADIATIVE TRANSFER N 1193 5215 95 594 

RADIATORS N 29 198 2 36 

RADICALS N 471 291 52 335 

RADII N 269 1079 2 108 

RADIO ALTIMETERS N 402 585 4 232 

RADIO ANTENNAS N 324 1140 46 397 

RADIO ASTRONOMY N 1198 5886 184 679 

RADIO ASTRONOMY EXPLORER SATELLITE N 49 33 0 36 

RADIO ATTENUATION N 207 901 3 127 

RADIO ATTENUATION MEASUREMENT PROJECT N 19 0 0 19 

RADIO AURORAS N 18 226 2 10 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

RADIO BEACONS N 246 559 7 200 

RADIO BURSTS N 181 462 6 82 

RADIO COMMUNICATION N 1122 1458 187 1714 

RADIO CONTROL N 46 129 14 66 

RADIO DIRECTION FINDERS N 176 406 13 516 

RADIO ECHOES N 74 830 3 46 

RADIO ELECTRONICS N 86 269 57 85 

RADIO EMISSION N 432 2787 17 220 

RADIO EQUIPMENT N 496 428 103 1415 

RADIO FILTERS N 92 433 12 202 

RADIO FREQUENCIES N 2063 1467 152 2057 

RADIO FREQUENCY DISCHARGE N 104 585 4 36 

RADIO FREQUENCY HEATING N 347 999 8 56 

RADIO FREQUENCY IMPEDANCE PROBES N 52 101 2 20 

RADIO FREQUENCY INTERFERENCE N 1290 1302 75 1839 

RADIO FREQUENCY SHIELDING N 44 63 2 29 

RADIO GALAXIES N 148 2273 14 53 

RADIO HORIZONS N 16 42 0 7 

RADIO INTERFEROMETERS N 290 968 7 205 

RADIO JETS (ASTRONOMY) N 21 575 0 5 

RADIO METEOROLOGY N 115 339 37 49 

RADIO METEORS N 31 445 3 29 

RADIO NAVIGATION N 429 715 38 507 

RADIO OBSERVATION N 94 863 9 47 

RADIO OCCULTATION N 62 328 0 38 

RADIO PHYSICS N 42 194 20 86 

RADIO PROBING N 27 660 4 21 

RADIO RANGE N 24 96 0 32 

RADIO RECEIVERS N 618 1602 42 1037 

RADIO RECEPTION N 1 1 1 382 16 129 

RADIO RELAY SYSTEMS N 411 740 26 603 

RADIO SCATTERING N 62 763 0 35 

RADIO SIGNALS N 495 1300 20 447 

RADIO SOURCES (ASTRONOMY) N 528 5064 41 240 

RADIO SPECTRA N 154 2475 11 65 

RADIO SPECTROSCOPY N 39 303 8 18 

RADIO STARS N 80 485 6 48 

RADIO TELEGRAPHY N 6 20 3 14 

RADIO TELEMETRY N 277 678 10 195 

RADIO TELESCOPES N 328 2301 46 229 

RADIO TRACKING N 107 390 8 80 

RADIO TRANSMISSION N 1311 2131 133 1117 

RADIO TRANSMITTERS N 350 649 29 649 

RADIO WAVE REFRACTION N 127 469 2 24 

RADIO WAVES N 975 1144 210 625 

RADIOACTIVE AGE DETERMINATION N 126 837 21 88 

RADIOACTIVE CONTAMINANTS N 333 69 23 183 

RADIOACTIVE DEBRIS N 29 14 2 35 

RADIOACTIVE DECAY N 1291 703 35 329 

RADIOACTIVE ISOTOPES N 1671 935 203 1119 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER T

RADIOACTIVE MATERIALS N 480 150 73 305 

RADIOACTIVE WASTES N 1265 130 107 823 2

RADIOACTIVITY N 551 230 162 356 

RADIOBIOLOGY N 868 991 169 421 2

RADIOCARDIOGRAPHY N 1 3 0 0 

RADIOCHEMICAL SEPARATION N 35 18 5 15 

RADIOCHEMISTRY N 634 99 135 290 

RADIOGENIC MATERIALS N 33 85 2 19 

RADIOGONIOMETERS N 7 24 0 2 

RADIOGRAPHY N 760 1018 125 816 2

RADIOIMMUNOASSAY N 21 13 11 39 

RADIOISOTOPE BATTERIES N 164 259 6 152 

RADIOLOGY N 195 119 101 135 

RADIOLYSIS N 258 92 18 153 

RADIOMETEOROGRAPHS N 9 12 0 28 

RADIOMETERS N 1982 1823 65 2067 5

RADIOMETRIC CORRECTION N 159 261 0 17 

RADIOMETRIC RESOLUTION N 276 136 0 29 

RADIOPATHOLOGY N 77 68 8 16 

RADIOPHOSPHORS N 4 1 0 2 

RADIOSONDES N 969 790 16 464 2

RADIOTELEPHONES N 55 45 7 45 

RADIUM N 34 1 7 17 

RADIUM ISOTOPES N 16 5 0 4 

RADIUM 226 N 10 6 0 1 1 

RADOME MATERIALS N 45 262 6 117 

RADOMES N 241 402 18 766 

RADON N 138 57 9 70 

RADON ISOTOPES N 52 55 1 24 

RADUGA SATELLITE N 1 7 0 3 

RAFTS N 8 11 0 10 

RAIL TRANSPORTATION N 566 694 140 507 

RAILGUN ACCELERATORS N 166 287 1 67 

RAILROAD HUMPING TESTS N 1 4 0 6 

RAILS N 90 70 14 110 

RAIN N 1653 2032 44 730 4

RAIN EROSION N 33 97 2 64 

RAIN FORESTS N 53 80 9 24 

RAIN GAGES N 283 200 1 73 

RAIN IMPACT DAMAGE N 69 142 4 108 

RAINBOWS N 9 46 7 2 

RAINDROPS N 252 871 2 124 

RAINMAKING N 27 9 2 9 

RAINSTORMS N 171 179 1 54 

RAKES N 5 9 0 3 

RAM N 3 4 0 4 

RAM B LAUNCH VEHICLE N 0 0 0 4 

RAMAN LASERS N 93 527 11 77 

RAMAN SPECTRA N 1254 2236 103 520 4

RAMAN SPECTROSCOPY N 723 663 97 295 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

RAMJET ENGINES N 471 563 21 1712 

RAMJET MISSILES N 42 76 1 425 

RAMP FUNCTIONS N 28 44 0 19 

RAMPS N 0 29 0 7 

RAMPS (STRUCTURES) N 42 50 2 51 

RAMS (PRESSES) N 12 5 0 11 

RAMS (PUMPS) N 5 11 0 14 

RAMSAUER EFFECT N 10 18 0 3 

RAND PROJECT N 1 3 3 10 

RANDOM ACCESS N 55 133 1 14 

RANDOM ACCESS MEMORY N 388 598 15 320 

RANDOM ERRORS N 209 867 4 83 

RANDOM LOADS N 160 695 6 47 

RANDOM NOISE N 940 2945 31 315 

RANDOM NUMBERS N 183 130 27 58 

RANDOM PROCESSES N 957 4142 142 362 

RANDOM SAMPLING N 332 347 25 99 

RANDOM SIGNALS N 189 1030 23 77 

RANDOM VARIABLES N 1552 1080 99 624 

RANDOM VIBRATION N 291 1054 32 163 

RANDOM WALK N 161 355 12 28 

RANGE N 19 46 1 39 

RANGE (EXTREMES) N 454 525 11 637 

RANGE AND RANGE RATE TRACKING N 196 224 1 121 

RANGE ERRORS N 120 325 0 70 

RANGE FINDERS N 182 131 5 302 

RANGE RESOURCES N 73 11 1 4 

RANGE SAFETY N 45 38 0 220 

RANGEFINDING N 516 495 13 699 

RANGELANDS N 195 117 7 27 

RANGER BLOCK 3 TELEVISION SYSTEM N 2 1 0 3 

RANGER LUNAR LANDING VEHICLES N 0 0 0 4 

RANGER LUNAR PROBES N 18 23 1 38 

RANGER PROJECT N 8 9 3 42 

RANGER 1 LUNAR PROBE N 0 0 0 4 

RANGER 2 LUNAR PROBE N 0 0 0 2 

RANGER 3 LUNAR PROBE N 0 1 1 5 

RANGER 4 LUNAR PROBE N 0 1 0 2 

RANGER 5 LUNAR PROBE N 0 1 0 3 

RANGER 6 LUNAR PROBE N 1 0 0 5 

RANGER 7 LUNAR PROBE N 2 4 2 6 

RANGER 8 LUNAR PROBE N 0 3 1 1 

RANGER 9 LUNAR PROBE N 3 2 1 0 

RANGES (FACILITIES) N 68 22 2 142 

RANK TESTS N 120 93 2 21 

RANKINE CYCLE N 607 518 11 390 

RANKINE-HUGONIOT RELATION N 88 344 0 17 

RANKING N 330 60 8 119 

RAOULT LAW N 22 12 1 7 

RAPID BALLISTICS IDENTIFICATION N 2 2 0 0 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

RAPID EYE MOVEMENT STATE N 52 172 7 22 

RAPID QUENCHING (METALLURGY) N 114 1049 6 73 

RAPID TRANSIT SYSTEMS N 343 621 64 305 

RAPIDS N 1 0 0 0 

RARE EARTH ALLOYS N 105 261 19 74 

RARE EARTH COMPOUNDS N 376 293 22 181 

RARE EARTH ELEMENTS N 541 814 84 285 

RARE GAS COMPOUNDS N 9 83 0 8 

RARE GAS-HALIDE LASERS N 25 252 0 20 

RARE GASES N 856 2029 45 527 

RAREFACTION N 63 138 0 24 

RAREFIED GAS DYNAMICS N 246 1505 36 96 

RAREFIED GASES N 200 507 13 95 

RAREFIED PLASMAS N 51 850 4 13 

RASTER SCANNING N 90 143 0 16 

RATE OF CLIMB INDICATORS N 5 8 1 6 

RATES (PER TIME) N 1808 1094 14 2324 

RATINGS N 142 115 42 134 

RATIOMETERS N 7 9 0 9 

RATIONAL FUNCTIONS N 100 210 11 29 

RATIONS N 30 3 4 71 

RATIOS N 669 291 17 402 

RATS N 1456 2904 33 1024 

RAVINES N 1 2 0 1 

RAWINSONDES N 338 260 3 104 

RAY TRACING N 716 2238 15 337 

RAYLEIGH DISTRIBUTION N 139 334 7 32 

RAYLEIGH EQUATIONS N 79 178 4 25 

RAYLEIGH NUMBER N 158 853 0 57 

RAYLEIGH SCATTERING N 545 1268 18 206 

RAYLEIGH WAVES N 314 535 5 138 

RAYLEIGH-BENARD CONVECTION N 15 177 0 2 

RAYLEIGH-RITZ METHOD N 152 729 14 52 

RAYON N 19 24 2 54 

RAYS N 15 19 4 14 

RAYTHEON COMPUTERS N 4 2 0 7 

RAZOR BLADES N 5 3 0 1 

RB-50 AIRCRAFT N 0 0 0 1 

RC CIRCUITS N 149 977 28 124 

RCA COMPUTERS N 4 2 1 1 

RCA SATCOM SATELLITES N 11 69 1 13 

RCA SPECTRA 70 COMPUTER N 1 3 0 0 

RCA-110 COMPUTERS N 1 0 0 5 

RDX N 138 76 0 241 

REACTANCE N 45 186 1 37 

REACTION N 17 8 3 22 

REACTION BONDING N 53 182 2 18 

REACTION CONTROL N 65 171 2 132 

REACTION KINETICS N 6878 8883 495 3797 2

REACTION PRODUCTS N 207 397 1 127 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

REACTION TIME N 674 792 30 625 

REACTION WHEELS N 202 229 2 47 

REACTIVITY N 679 163 42 485 

REACTOR CORES N 1079 203 13 852 

REACTOR DESIGN N 1207 1379 59 1375 

REACTOR MATERIALS N 1513 567 78 1357 

REACTOR PHYSICS N 631 133 40 366 

REACTOR SAFETY N 1521 203 67 1013 

REACTOR STARTUP TESTS N 37 19 0 165 

REACTOR TECHNOLOGY N 1853 715 125 1973 

REACTORS N 38 10 2 38 

READ-ONLY MEMORY DEVICES N 125 231 5 105 

READERS N 167 38 31 137 

READING N 125 57 46 100 

READOUT N 257 294 4 198 

REAGENTS N 11 13 10 22 

REAL GASES N 146 402 13 83 

REAL NUMBERS N 92 79 43 61 

REAL TIME OPERATION N 4340 5637 134 2531 1

REAL VARIABLES N 191 187 80 63 

REATTACHED FLOW N 161 718 0 50 

REBREATHING N 20 87 0 14 

RECEIVERS N 966 835 43 1153 

RECEIVING N 6 4 0 4 

RECEPTION DIVERSITY N 73 405 2 35 

RECEPTORS (PHYSIOLOGY) N 61 322 62 61 

RECESSES N 8 16 0 3 

RECESSION N 7 15 1 26 

RECHARGING N 78 83 1 20 

RECIPROCAL THEOREMS N 36 224 8 17 

RECIPROCATION N 39 46 6 22 

RECIPROCITY THEOREM N 16 112 0 3 

RECIRCULATIVE FLUID FLOW N 165 902 3 62 

RECLAMATION N 217 30 17 180 

RECOGNITION N 143 46 20 147 

RECOIL ATOMS N 50 33 0 13 

RECOIL IONS N 44 15 0 10 

RECOIL PROTONS N 92 14 0 24 

RECDILINGS N 85 50 0 31 

RECOMBINATION COEFFICIENT N 105 901 0 62 

RECOMBINATION REACTIONS N 647 1381 18 275 

RECOMMENDATIONS N 497 14 43 245 

RECONNAISSANCE N 126 71 24 390 

RECONNAISSANCE AIRCRAFT N 86 213 17 332 

RECONNAISSANCE SPACECRAFT N 26 50 8 239 

RECONSTRUCTION N 88 66 11 44 

RECORDERS N 13 7 3 24 

RECORDING N 156 26 47 308 

RECORDING HEADS N 19 40 0 11 

RECORDING INSTRUMENTS N 492 1030 34 492 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

RECORDS N 134 16 142 166 

RECORDS MANAGEMENT N 3 0 0 0 

RECOVERAB I LI TY N 65 47 1 68 

RECOVERABLE LAUNCH VEHICLES N 52 46 0 82 

RECOVERABLE SPACECRAFT N 56 68 4 124 

RECOVERY N 65 95 4 126 

RECOVERY PARACHUTES N 82 167 1 144 

RECOVERY VEHICLES N 18 30 0 54 

RECOVERY ZONES N 9 18 0 32 

RECREATION N 143 27 53 149 

RECRYSTALLIZATION N 487 1828 20 244 

RECTANGLES N 166 256 4 54 

RECTANGULAR BEAMS N 44 278 1 12 

RECTANGULAR PANELS N 91 167 2 47 

RECTANGULAR PLANFORMS N 65 62 0 22 

RECTANGULAR PLATES N 291 2793 20 86 

RECTANGULAR WAVEGUIDES N 120 1447 7 52 

RECTANGULAR WIND TUNNELS N 15 23 0 7 

RECTANGULAR WINGS N 159 398 0 96 

RECTENNAS N 105 88 0 14 

RECTIFICATION N 54 83 4 37 

RECTIFIERS N 204 233 61 417 

RECTUM N 29 38 2 22 

RECURSIVE FUNCTIONS N 968 1665 61 270 

RECYCLING N 397 359 78 319 

RED ARCS N 15 113 1 8 

RED DWARF STARS N 7 159 0 1 

RED GIANT STARS N 75 1126 4 9 

RED SEA N 45 23 1 27 

RED SHIFT N 414 4932 17 100 

RED TIDE N 11 7 2 8 

RED EYE MISSILE N 2 1 0 157 

REDOX CELLS N 77 118 2 24 

REDUCED GRAVITY N 1645 1296 23 1586 

REDUCED ORDER FILTERS N 20 235 0 0 

REDUCTION N 75 49 6 68 

REDUCTION (CHEMISTRY) N 822 651 52 449 

REDUNDANCY N 741 735 18 378 

REDUNDANCY ENCODING N 183 391 2 60 

REDUNDANT COMPONENTS N 233 1055 11 229 

REEDS (PLANTS) N 2 4 2 3 

REEFS N 30 14 5 12 

REELS N 29 11 0 53 

REENTRY N 132 22 18 383 

REENTRY COMMUNICATION N 50 51 1 111 

REENTRY DECOYS N 2 2 0 113 

REENTRY EFFECTS N 207 305 3 413 

REENTRY GUIDANCE N 50 119 4 113 

REENTRY PHYSICS N 142 298 20 356 

REENTRY RANGE N 5 24 0 9 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM **"'* .. ** TYPE STAR IAA NLN OTHER 

REENTRY SHIELDING N 157 256 5 234 

REENTRY TRAJECTORIES N 189 370 5 397 

REENTRY VEHICLES N 857 1040 26 5234 

REFERENCE ATMOSPHERES N 99 266 8 37 

REFERENCE STARS N 90 810 4 25 

REFERENCE SYSTEMS N 179 722 72 137 

REFILLING N 7 7 0 6 

REFINING N 495 171 73 469 

REFLECTANCE N 2068 3947 29 1131 

REFLECTED WAVES N 356 1932 5 163 

REFLECTING TELESCOPES N 173 788 20 79 

REFLECTION N 672 292 30 515 

REFLECTION NEBULAE N 22 228 0 4 

REFLECTOMETERS N 186 203 7 146 

REFLECTOR ANTENNAS N 112 648 1 27 

REFLECTORS N 705 1310 28 592 

REFLEXES N 179 497 17 86 

REFORESTATION N 11 5 0 3 

REFRACTED WAVES N 121 567 6 56 

REFRACTING TELESCOPES N 20 101 4 20 

REFRACTION N 396 302 35 283 

REFRACTIVITY N 1614 5665 29 855 

REFRACTOMETERS N 62 94 4 70 

REFRACTORIES N 68 33 11 60 

REFRACTORY COATINGS N 51 79 5 59 

REFRACTORY MATERIALS N 1073 1828 165 1416 

REFRACTORY METAL ALLOYS N 277 749 36 322 

REFRACTORY METALS N 454 817 64 579 

REFRACTORY PERIOD N 6 14 1 2 

REFRIGERANTS N 190 71 20 82 

REFRIGERATING N 161 117 102 132 

REFRIGERATING MACHINERY N 180 113 91 198 

REFRIGERATORS N 238 291 10 220 

REF SAT N 1 0 0 0 

REFUELING N 155 175 6 201 

REGENERATION N 15 27 1 10 

REGENERATION (ENGINEERING) N 325 373 8 232 

REGENERATION (PHYSIOLOGY) N 97 74 12 46 

REGENERATIVE COOLING N 147 112 1 475 

REGENERATIVE FUEL CELLS N 77 88 3 54 

REGENERATORS N 198 229 7 135 

REGGE POLES N 580 19 9 100 

REGIMES N 9 6 6 5 

REGIONAL PLANNING N 791 332 93 610 

REGIONS N 223 80 33 327 

REGISTERS N 3 9 15 3 

REGISTERS (AIR CIRCULATION) N 0 0 0 2 

REGISTERS (COMPUTERS) N 117 112 9 88 

REGOLITH N 120 436 4 47 

REGRESSION ANALYSIS N 2777 2406 117 1014 
NASA COME. r lEO FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

REGRESSION COEFFICIENTS N 127 130 5 35 

REGULARITY N 60 43 0 12 

REGULATIONS N 1303 772 495 1021 

REGULATORS N 150 480 28 134 

REGULATORY MECHANISMS (BIOLOGY) N 140 375 0 33 

REGULUS MISSILE N 0 0 0 3 

REINFORCED PLASTICS N 524 2270 145 745 

REINFORCED PLATES N 97 1274 3 41 

REINFORCED SHELLS N 151 1726 8 75 

REINFORCEMENT N 9 14 1 14 

REINFORCEMENT (PSYCHOLOGY) N 46 56 37 21 

REINFORCEMENT (STRUCTURES) N 544 531 107 507 

REINFORCEMENT RINGS N 80 345 3 40 

REINFORCING FIBERS N 1240 3659 92 1305 

REINFORCING MATERIALS N 124 153 7 236 

REISSNER THEORY N 48 440 2 15 

REISSNER-NORDSTROM SOLUTION N 2 45 0 0 

REJECTION N 56 42 1 103 

RELATIONSHIPS N 34 15 20 23 

RELATIVE BIOLOGICAL EFFECTIVENESS (RBE) N 47 58 0 10 

RELATIVISTIC EFFECTS N 356 1508 38 126 

RELATIVISTIC ELECTRON BEAMS N 315 1580 4 131 

RELATIVISTIC PARTICLES N 448 2525 13 119 

RELATIVISTIC PLASMAS N 231 979 7 61 

RELATIVISTIC THEORY N 412 1135 87 118 

RELATIVISTIC VELOCITY N 140 467 3 24 

RELATIVITY N 600 3769 429 307 

RELAXATION N 31 38 3 34 

RELAXATION (MECHANICS) N 461 1126 46 195 

RELAXATION (PHYSIOLOGY) N 33 68 9 14 

RELAXATION METHOD (MATHEMATICS) N 386 858 12 65 

RELAXATION OSCILLATORS N 75 283 4 121 

RELAXATION TIME N 576 2023 7 198 

RELAY N 13 54 2 21 

RELAY SATELLITES N 67 152 4 75 

RELAY 1 SATELLITE N 2 2 0 0 

RELAY 2 SATELLITE N 6 2 0 3 

RELEASING N 166 25 2 482 

RELIABILITY N 2926 737 259 4462 

RELIABILITY ANALYSIS N 1882 3934 135 1661 

RELIABILITY ENGINEERING N 2767 4233 356 5012 1

RELIC RADIATION N 23 684 2 6 

RELIEF MAPS N 162 399 11 83 

RELIEF VALVES N 38 28 6 303 

RELIEVING N 4 0 2 0 

RELOCATION N 16 7 1 19 

RELUCTANCE N 20 35 0 7 

REMANENCE N 46 285 0 20 

REMOOULATION N 4 6 0 1 

REMOTE CONSOLES N 197 85 12 161 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

REMOTE CONTROL N 978 836 99 1281 

REMOTE HANDLING N 295 143 13 166 

REMOTE MANIPULATOR SYSTEM N 234 205 3 117 

REMOTE REGIONS N 86 192 3 83 

REMOTE SENSING N 3870 7661 449 2838 1

REMOTE SENSORS N 4923 6820 565 3229 1

REMOTELY PILOTED VEHICLES N 420 727 38 818 

REMOVAL N 226 49 20 287 

RENAL FUNCTION N 106 250 24 69 

RENDEZVOUS N 21 19 2 50 

RENDEZVOUS GUIDANCE N 68 134 7 113 

RENDEZVOUS SPACECRAFT N 40 72 0 96 

RENDEZVOUS TRAJECTORIES N 108 207 2 124 

RENE 41 N 28 34 0 34 

RENE 63 N 0 1 0 0 

RENE 77 N 2 4 0 0 

RENE 95 N 13 39 1 11 

RENORMALIZATION GROUP METHODS N 10 1 0 1 

REPEATERS N 154 389 3 127 

REPETITION N 96 44 1 94 

REPLACING N 185 85 10 275 

REPLENISHMENT N 34 16 3 49 

REPLICAS N 46 47 6 38 

REPORT GENERATORS N 30 10 7 86 

REPORTS N 685 73 382 895 

REPRESENTATIONS N 179 50 43 48 

REPRODUCTION N 18 33 6 24 

REPRODUCTION (BIOLOGY) N 110 63 50 74 

REPRODUCTION (COPYING) N 139 88 72 187 

REPRODUCTIVE SYSTEMS N 43 38 28 17 

REPTILES N 14 9 13 8 

REPUBLIC AIRCRAFT N 0 1 1 6 

REPUBLIC OF SOUTH AFRICA N 130 98 17 192 

REQUIREMENTS N 1796 68 24 3405 

RESCUE OPERATIONS N 443 615 55 519 

RESEARCH N 1095 137 1056 1934 

RESEARCH AIRCRAFT N 353 517 16 329 

RESEARCH AND DEVELOPMENT N 4810 5224 962 4741 1

RESEARCH FACILITIES N 1899 406 207 1363 

RESEARCH MANAGEMENT N 2573 310 353 2272 

RESEARCH PROJECTS N 1906 763 185 1673 

RESEARCH VEHICLES N 106 113 12 112 

RESERPINE N 5 14 0 0 

RESERVES N 146 13 16 132 

RESERVOIRS N 713 189 26 609 

RESIDENTIAL AREAS N 308 190 14 195 

RESIDENTIAL ENERGY N 732 155 16 440 

RESIDUAL GAS N 66 142 4 48 

RESIDUAL STRENGTH N 72 199 3 15 

RESIDUAL STRESS N 1154 3092 56 511 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ***-  TYPE STAR IAA NLN OTHER 

RESIDUES N 244 109 25 247 

RESILIENCE N 49 47 0 42 

RESIN BONDING N 102 288 3 95 

RESIN MATRIX COMPOSITES N 200 770 5 110 

RESINS N 290 208 77 413 

RESISTANCE N 166 142 11 142 

RESISTANCE HEATING N 210 825 5 121 

RESISTANCE THERMOMETERS N 116 249 5 70 

RESISTOJET ENGINES N 99 130 0 42 

RESISTORS N 404 479 34 1419 

RESOLUTION N 753 1083 23 660 

RESOLUTION CELL N 18 12 0 10 

RESOLVERS N 15 12 1 19 

RESONANCE N 1591 2014 80 784 

RESONANCE CHARGE EXCHANGE N 83 65 0 23 

RESONANCE FLUORESCENCE N 106 340 4 66 

RESONANCE LINES N 82 624 3 14 

RESONANCE PROBES N 88 73 5 33 

RESONANCE SCATTERING N 463 623 8 136 

RESONANCE TESTING N 109 166 6 59 

RESONANT FREQUENCIES N 1779 7466 17 920 1

RESONANT TUNNELING N 44 217 0 8 

RESONANT VIBRATION N 377 1909 18 174 

RESONATORS N 623 1378 43 653 

RESOURCE ALLOCATION N 357 366 51 329 

RESOURCES N 303 66 229 439 

RESOURCES MANAGEMENT N 1979 732 288 1211 

RESPIRATION N 514 414 90 363 

RESPIRATORS N 51 20 13 59 

RESPIRATORY DISEASES N 105 125 34 69 

RESPIRATORY IMPEDANCE N 26 86 2 8 

RESPIRATORY PHYSIOLOGY N 207 1096 21 66 

RESPIRATORY RATE N 180 529 2 55 

RESPIRATORY REFLEXES N 25 113 0 9 

RESPIRATORY SYSTEM N 324 300 52 152 

RESPIROMETER$ N 19 38 0 18 

RESPONSE BIAS N 97 82 1 22 

RESPONSE TIME (COMPUTERS) N 261 299 1 69 

RESPONSES N 629 56 12 1125 

REST N 67 148 6 49 

RESTARTABLE ROCKET ENGINES N 29 38 1 86 

RESTORATION N 80 64 22 47 

RESULTANTS N 3 6 0 2 

RESUSCITATION N 13 28 9 35 

RETAINING N 73 13 6 96 

RETARDANTS N 21 10 3 16 

RETARDERS N 1 3 0 0 

RETARDERS (DEVICES) N 8 27 0 12 

RETARDING N 117 117 2 83 

RETENTION N 8 21 0 11 
NASA COMBINED FILE POSTING STATISTICS 

910117 

** ***** SUBJECT TERM *~***** TYPE STAR IAA NLN OTHER 

RETENTION (PSYCHOLOGY) N 146 75 30 58 

RETICLES N 41 51 2 45 

RETICULOCYTES N 11 28 6 12 

RETINA N 274 538 20 189 

RETINAL ADAPTATION N 72 246 3 21 

RETINAL IMAGES N 68 548 3 26 

RETINENE N 3 20 0 1 

RETIREMENT N 17 9 70 29 

RETIREMENT FOR CAUSE N 15 28 0 5 

RETORT PROCESSING N 40 17 1 35 

RETRACTABLE EQUIPMENT N 69 47 1 53 

RETRAINING N 19 6 18 18 

RETRIEVAL N 32 42 19 59 

RETROFIRING N 19 12 0 18 

RETROFITTING N 266 145 4 288 

RETROREFLECTION N 109 169 4 81 

RETROREFLECTORS N 53 48 0 30 

RETROROCKET ENGINES N 19 22 0 98 

RETROTHRUST N 7 19 0 25 

RETURN BEAM VIDICONS N 147 85 1 21 

RETURN TO EARTH SPACE FLIGHT N 44 117 1 36 

REUSABLE HEAT SHIELDING N 76 83 1 111 

REUSABLE LAUNCH VEHICLES N 65 156 4 98 

REUSABLE ROCKET ENGINES N 44 73 0 92 

REUSABLE SPACECRAFT N 266 550 103 469 

REUSE N 78 74 7 65 

REVENUE N 38 30 31 83 

REVERBERATION N 191 92 11 168 

REVERBERATION CHAMBERS N 35 29 0 3 

REVERSE FIELD PINCH N 310 111 0 29 

REVERSE OSMOSIS N 98 10 4 86 

REVERSED FLOW N 151 535 0 87 

REVERSING N 142 123 4 160 

REVIEWING N 246 128 25 173 

REVISIONS N 516 173 22 1018 

REVOLVING N 35 21 2 25 

REWARD (PSYCHOLOGY) N 11 14 11 10 

REYNOLDS EQUATION N 159 494 4 47 

REYNOLDS NUMBER N 3400 9156 42 2073 1

REYNOLDS STRESS N 385 1656 5 116 

RF-4 AIRCRAFT N 3 12 0 43 

RHEA (ASTRONOMY) N 6 39 0 3 

RHENIUM N 196 221 11 132 

RHENIUM ALLOYS N 120 331 3 66 

RHENIUM COMPOUNDS N 32 22 0 22 

RHENIUM ISOTOPES N 16 27 0 4 

RHEOCASTING N 3 19 0 3 

RHEOELECTRICAL SIMULATION N 26 89 3 5 

RHEOENCEPHALOGRAPHY N 27 69 1 10 

RHEOLOGY N 698 879 134 455 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

RHEOMETERS N 78 58 8 22 

RHESUS FACTOR N 2 5 0 0 

RHEUMATIC DISEASES N 8 12 2 4 

RHIZOPUS N 3 2 0 1 

RHO-MESONS N 19 1 0 6 

RHODAMINE N 85 298 0 3 

RHODE ISLAND N 61 6 8 53 

RHODIUM N 182 49 7 69 

RHODIUM ALLOYS N 49 31 0 19 

RHODIUM COMPOUNDS N 45 10 0 14 

RHODIUM ISOTOPES N 11 3 0 6 

RHOMBIC ANTENNAS N 13 21 3 10 

RHOMBOHEDRONS N 12 40 0 6 

RHOMBOIDS N 9 9 0 3 

RHONE DELTA (FRANCE) N 6 6 0 1 

RHYOLITE N 48 31 0 6 

RHYTHM N 1 8 0 7 

RHYTHM (BIOLOGY) N 181 444 61 134 

RIBBON PARACHUTES N 35 89 0 18 

RIBBONS N 200 308 2 116 

RIBLETS N 22 61 0 7 

RIBOFLAVIN N 5 10 1 3 

RIBONUCLEIC ACIDS N 149 356 37 107 

RIBOSE N 11 17 0 6 

RIBS (SUPPORTS) N 110 759 3 74 

RICCATI EQUATION N 269 893 11 73 

RICE N 88 85 8 17 

RICHARDS THEOREM N 3 2 0 3 

RICHARDSON NUMBER N 118 500 0 38 

RIDGES N 29 152 0 23 

RIDING QUALITY N 145 77 5 91 

RIEMANN MANIFOLD N 292 528 91 142 

RIEMANN WAVES N 20 88 6 9 

RIESZ THEOREM N 13 21 7 10 

RIFLES N 20 4 2 41 

RIFT (REACTOR IN FLIGHT TEST) N 0 0 0 31 

RIGGING N 14 27 9 33 

RIGID MOUNTING N 19 29 0 21 

RIGID ROTOR HELICOPTERS N 9 40 0 5 

RIGID ROTORS N 134 343 5 37 

RIGID ROTORS (PLASMA PHYSICS) N 2 11 0 0 

RIGID STRUCTURES N 841 2836 98 444 

RIGID WINGS N 27 31 0 14 

RIGIDITY N 63 287 3 32 

RIMS N 32 75 0 16 

RING CURRENTS N 179 1030 3 49 

RING DISCHARGE N 31 28 0 12 

RING GALAXIES N 5 82 0 3 

RING LASERS N 160 1434 8 190 

RING STRUCTURES N 464 1786 22 343 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

RING WINGS N 13 14 3 10 

RINGS N 70 97 2 68 

RINGS (MATHEMATICS) N 188 61 73 107 

RID GRANDE (NORTH AMERICA) N 32 13 4 14 

RIOMETERS N 135 336 2 59 

RIPPLES N 99 118 1 52 

RISERS N 12 7 1 14 

RISK N 999 711 102 692 

RIT ENGINES N 16 55 0 1 

RITZ AVERAGING METHOD N 77 534 4 22 

RIVER BASINS N 423 114 37 345 

RIVERS N 844 233 152 594 

RIVETED JOINTS N 80 119 6 46 

RIVETING N 26 37 12 24 

RIVETS N 52 60 9 79 

RL CIRCUITS N 9 81 1 8 

RL-10 ENGINES N 14 6 0 68 

RL-10-A-1 ENGINE N 1 1 0 7 

RL-10-A-3 ENGINE N 0 1 0 25 

RLC CIRCUITS N 36 670 3 25 

ROADS N 351 86 78 282 

ROADWAY POWERED VEHICLES N 12 3 0 2 

ROASTING N 80 12 0 46 

ROBIN BALLOONS N 16 6 0 2 

ROBOT ARMS N 150 56 0 16 

ROBOT CONTROL N 446 659 0 114 

ROBOT DYNAMICS N 120 106 0 9 

ROBOT SENSORS N 34 10 0 4 

ROBOTICS N 1667 1367 159 996 

ROBOTS N 1538 1287 278 949 

ROBUSTNESS (MATHEMATICS) N 775 1880 9 125 

ROCHE LIMIT N 32 474 1 7 

ROCK BOLTS N 4 1 2 9 

ROCK INTRUSIONS N 57 31 9 25 

ROCK MECHANICS N 129 74 12 84 

ROCKET CATAPULTS N 5 9 1 28 

ROCKET ENGINE CASES N 254 259 2 768 

ROCKET ENGINE CONTROL N 77 295 8 161 

ROCKET ENGINE DESIGN N 445 1839 43 1397 

ROCKET ENGINE NOISE N 20 25 0 23 

ROCKET ENGINE 9KS-11000 N 0 0 0 

ROCKET ENGINES N 1079 994 94 2789 

ROCKET EXHAUST N 686 707 7 1649 

ROCKET FIRING N 81 144 3 323 

ROCKET FLIGHT N 150 446 40 160 

ROCKET LAUNCHERS N 88 106 4 354 

ROCKET LAUNCHING N 443 302 8 870 

ROCKET LININGS N 47 43 1 189 

ROCKET NOSE CONES N 43 47 1 86 

ROCKET NOZZLES N 473 503 6 1927 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ROCKET OXIDIZERS N 123 161 2 549 

ROCKET PLANES N 12 7 3 11 

ROCKET PROPELLANTS N 333 334 45 768 

ROCKET PROPELLED SLEDS N 87 54 1 165 

ROCKET SOUNDING N 837 3091 21 380 

ROCKET TEST FACILITIES N 75 155 3 163 

ROCKET THRUST N 204 389 12 252 

ROCKET VEHICLES N 175 219 148 318 

ROCKET-BORNE INSTRUMENTS N 453 1348 2 285 

ROCKET-BORNE PHOTOGRAPHY N 33 73 1 14 

ROCKETS N 65 81 98 265 

ROC KOONS N 0 4 0 2 

ROCKS N 1504 570 313 1147 

ROCKWELL HARDNESS N 20 27 1 7 

ROCKY MOUNTAINS (NORTH AMERICA) N 94 81 15 48 

RODENTS N 49 67 9 80 

RODS N 598 1866 21 376 

ROLL N 504 542 5 575 

ROLL FORMING N 158 243 7 158 

ROLLER BEARINGS N 308 394 25 247 

ROLLERS N 104 52 2 85 

ROLLING N 81 301 4 79 

ROLLING CONTACT LOADS N 182 409 15 88 

ROLLING MOMENTS N 307 413 3 241 

ROMANIA N 52 35 3 39 

RONCHI TEST N 5 19 0 2 

ROOFS N 109 50 48 102 

ROOM TEMPERATURE N 732 2581 5 496 

ROOMS N 64 23 6 15 

ROOT-MEAN-SQUARE ERRORS N 375 2400 2 137 

ROOTS N 12 24 2 10 

ROOTS OF EQUATIONS N 258 1466 35 95 

RORSCHACH TESTS N 2 10 1 3 

ROSAT MISSION N 30 93 0 28 

ROSETTE SHAPES N 11 52 2 16 

ROSHKO PREDICTION N 0 9 0 0 

ROSIN N 1 1 2 4 

ROSS ICE SHELF N 17 28 0 6 

ROSSBY REGIMES N 98 679 0 13 

ROTARY ENGINES N 25 49 0 26 

ROTARY GYROSCOPES N 59 556 3 37 

ROTARY STABILITY N 245 927 4 108 

ROTARY WING AIRCRAFT N 342 335 23 491 

ROTARY WINGS N 1610 2216 44 1254 

ROTATING BODIES N 595 2662 38 382 

ROTATING CYLINDERS N 232 1013 4 79 

ROTATING DISKS N 303 1780 6 121 

ROTATING ELECTRICAL MACHINES N 47 101 15 34 

ROTATING ENVIRONMENTS N 137 445 1 28 

ROTATING FLUIDS N 275 2360 12 89 
NASA COMBINED FILE POSTING STATISTICS 

910117 

 •**  SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ROTATING GENERATORS N 79 69 14 61 

ROTATING LIQUIDS N 84 219 2 60 

ROTATING MATTER N 38 316 2 16 

ROTATING MIRRORS N 79 195 2 32 

ROTATING PLASMAS N 214 666 3 35 

ROTATING SHAFTS N 221 811 6 139 

ROTATING SPHERES N 85 382 0 24 

ROTATING STALLS N 88 225 1 20 

ROTATION N 1408 846 57 826 

ROTATIONAL SPECTRA N 100 413 0 13 

ROTIFERA N 1 0 1 2 

ROTOCHUTES N 2 4 0 3 

ROTONS N 25 6 0 5 

ROTOR AERODYNAMICS N 1016 1741 42 537 

ROTOR BLADES N 290 1195 2 171 

ROTOR BLADES (TURBOMACHINERY) N 1060 1164 27 548 

ROTOR BODY INTERACTIONS N 51 213 1 14 

ROTOR DYNAMICS N 38 70 0 13 

ROTOR LIFT N 57 66 3 30 

ROTOR SPEED N 224 825 3 104 

ROTOR SYSTEMS RESEARCH AIRCRAFT N 26 24 1 13 

ROTORCRAFT AIRCRAFT N 46 226 4 39 

ROTORS N 1168 1215 50 910 

ROUGHNESS N 154 32 3 176 

ROUND TRIP TRAJECTORIES N 30 57 0 16 

ROUSE BELTS N 1 0 0 1 

ROUTES N 273 122 7 144 

ROUTINES N 49 15 4 36 

ROVER PROJECT N 29 24 0 183 

ROVING VEHICLES N 125 204 3 63 

ROVINGS N 1 20 0 1 

ROWLAND CIRCLES N 17 18 0 4 

RP-1 ROCKET PROPELLANTS N 27 11 0 36 

RTV-40 RUBBER (TRADEMARK) N 0 0 0 1 

RTV-60 RUBBER (TRADEMARK) N 0 0 0 1 

RUBBER N 475 360 188 588 

RUBBER COATINGS N 42 21 0 42 

RUBIDIUM N 216 311 4 107 

RUBIDIUM COMPOUNDS N 79 60 0 36 

RUBIDIUM ISOTOPES N 51 184 1 18 

RUBIDIUM 86 N 3 8 0 0 

RUBIS ROCKET VEHICLE N 2 3 0 0 

RUBY N 77 174 1 45 

RUBY LASERS N 660 2133 11 344 

RUDDERS N 49 70 2 70 

RUGGEDNESS N 26 9 1 44 

RULER METHOD N 4 1 0 2 

RULES N 131 81 71 41 

RUN TIME (COMPUTERS) N 615 2851 13 150 

RUNGE-KUTTA METHOD N 547 1492 14 193 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

RUNNING N 34 119 8 14 

RUNWAY ALIGNMENT N 34 19 0 14 

RUNWAY CONDITIONS N 262 401 3 178 

RUNWAY LIGHTS N 108 69 2 70 

RUNWAYS N 935 453 17 902 

RUPTURING N 402 331 16 399 

RURAL AREAS N 252 343 29 145 

RURAL LAND USE N 111 115 7 29 

RUST FUNGI N 6 3 0 5 

RUSTING N 43 18 6 40 

RUTHENIUM N 143 63 11 72 

RUTHENIUM ALLOYS N 23 66 0 4 

RUTHENIUM COMPOUNDS N 49 33 1 19 

RUTHENIUM ISOTOPES N 21 3 0 7 

RUT! LE N 110 91 4 32 

RWANDA N 0 3 1 1 

RYAN AIRCRAFT N 0 2 0 1 

RYDBERG SERIES N 127 588 6 39 

S CURVES N 10 29 0 6 

S GLASS N 37 59 0 15 

S MATRIX THEORY N 457 1079 13 112 

S STARS N 8 103 0 12 

S WAVES N 385 767 3 157 

S-N DIAGRAMS N 135 1271 3 58 

S-2 AIRCRAFT N 11 0 0 12 

S-3 AIRCRAFT N 22 65 0 137 

S-58 HELICOPTER N 2 5 0 0 

S-61 HELICOPTER N 11 16 0 8 

S-67 HELICOPTER N 6 3 0 1 

SA-321 HELICOPTER N 2 3 0 0 

SA-330 HELICOPTER N 4 8 0 2 

SAAB AIRCRAFT N 13 20 0 4 

SAAB 105 AIRCRAFT N 2 1 0 2 

SAAB 37 AIRCRAFT N 7 27 0 1 

SABATIER REACTION N 8 26 0 10 

SABOT PROJECTILES N 61 25 0 73 

SABOTAGE N 10 2 2 19 

SACCADIC EYE MOVEMENTS N 35 156 3 4 

SACCHAROMYCES N 6 10 0 3 

SACRAMENTO VALLEY (CA) N 30 7 1 8 

SADDLE POINTS N 90 272 1 23 

SADDLE POINTS (GAME THEORY) N 95 109 7 52 

SADDLES N 3 9 0 0 

SADDLES (SUPPORTS) N 6 8 1 4 

SAFEGUARD SYSTEM N 30 7 0 231 

SAFETY N 1535 130 354 2202 

SAFETY DEVICES N 714 426 115 828 

SAFETY FACTORS N 1418 1216 276 1360 

SAFETY MANAGEMENT N 999 561 342 943 

SAGE AIR DEFENSE SYSTEM N 2 1 1 5 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *****;.j<.., TYPE STAR IAA NLN OTHER 

SAGE SATELLITE N 27 68 0 40 

SAGINAW BAY ( MI) N 13 4 0 4 

SAGITTARIUS CONSTELLATION N 15 172 0 21 

SAGNAC EFFECT N 8 109 0 1 

SAHA EQUATIONS N 22 134 0 18 

SAHARA DESERT (AFRICA) N 53 109 4 14 

SAIL PROJECT N 8 2 0 9 

SAILS N 17 41 12 12 

SAILWINGS N 15 28 4 15 

SAINT ELMO FIRE N 0 4 0 0 

SAINT VENANT PRINCIPLE N 31 415 4 13 

SALICYLATES N 24 12 1 21 

SALINITY N 922 533 75 754 

SALIVA N 15 26 2 16 

SALIVARY GLANDS N 2 13 2 7 

SALMONELLA N 17 4 2 23 

SALT BATHS N 66 108 1 48 

SALT BEDS N 63 9 2 27 

SALT SPRAY TESTS N 128 231 2 222 

SALTON SEA ( CA) N 35 7 1 25 

SALTS N 188 269 23 160 

SALYUT SPACE STATION N 356 693 17 408 

SAMARIUM N 111 104 0 67 

SAMARIUM COMPOUNDS N 71 65 0 42 

SAMARIUM ISOTOPES N 35 84 1 3 

SAMOA N 6 6 0 5 

SAMOS N 15 4 0 8 

SAMPLED DATA SYSTEMS N 1 1 0 0 

SAMPLERS N 198 103 5 158 

SAMPLES N 397 82 18 327 

SAMPLING N 2921 455 234 1993 

SAN ANDREAS FAULT N 58 50 4 25 

SAN ANDREAS FAULT EXPERIMENT N 12 0 0 0 

SAN FRANCISCO (CA) N 35 16 15 31 

SAN FRANCISCO BAY (CA) N 70 41 45 44 

SAN JOAQUIN VALLEY (CA) N 24 15 6 14 

SAN JUAN MOUNTAINS (CO) N 30 5 1 1 

SAN MARCO SATELLITES N 23 29 0 17 

SAN MARCO 1 SATELLITE N 3 2 0 0 

SAN MARCO 2 SATELLITE N 10 11 0 0 

SAN MARCO 3 SATELLITE N 1 8 0 0 

SAN MARINO N 0 0 0 0 

SAN PABLO BAY (CA) N 1 0 0 3 

SAND CASTING N 1 7 0 1 

SAND HILLS REGION (GA-NC-SC) N 0 0 0 

SAND HILLS REGION (NE) N 17 3 0 1 

SANDPIPER TARGET MISSILE N 0 0 0 3 

SANDS N 537 267 37 408 

SANDSTONES N 136 41 17 113 

SANDWICH STRUCTURES N 782 2713 34 701 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******-+- TYPE STAR IAA NLN OTHER 

SANITATION N 90 33 51 98 

SANTOWAX (TRADEMARK) N 3 0 0 0 

SAPPHIRE N 302 387 2 309 

SAPROPHYTES N 1 1 0 2 

SARCINA N 1 3 0 0 

SARCOPLASMIC RETICULUM N 1 11 0 0 

SARGASSO SEA N 9 14 0 8 

SARSAT N 66 81 0 30 

SAS N 38 57 2 63 

SAS-1 N 9 11 0 6 

SAS-2 N 47 66 0 3 

SAS-3 N 7 71 0 9 

SASKATCHEWAN N 3 28 1 2 

SATELLITE ALTIMETRY N 98 244 0 41 

SATELLITE ANTENNAS N 617 1929 9 326 

SATELLITE ATMOSPHERES N 77 395 2 60 

SATELLITE ATTITUDE CONTROL N 1178 2554 23 393 

SATELLITE COMMUNICATION N 550 1879 6 285 

SATELLITE COMMUNICATIONS SHIPS N 26 65 2 33 

SATELLITE CONFIGURATIONS N 319 474 3 167 

SATELLITE CONTROL N 330 687 16 271 

SATELLITE DESIGN N 626 2097 19 299 

SATELLITE DOPPLER POSITIONING N 99 60 2 8 

SATELLITE DRAG N 141 546 1 47 

SATELLITE GROUND SUPPORT N 201 306 2 89 

SATELLITE GROUND TRACKS N 54 70 0 41 

SATELLITE GUIDANCE N 56 94 3 51 

SATELLITE IMAGERY N 1703 4061 10 393 

SATELLITE INSTRUMENTS N 510 928 18 466 

SATELLITE INTERCEPTORS N 9 27 2 56 

SATELLITE LIFETIME N 117 332 1 53 

SATELLITE NAVIGATION SYSTEMS N 267 582 14 143 

SATELLITE NETWORKS N 722 2629 32 426 

SATELLITE OBSERVATION N 3851 12058 187 1815 

SATELLITE ORBITS N 1508 3816 60 658 

SATELLITE ORIENTATION N 212 609 9 115 

SATELLITE PERTURBATION N 308 981 9 82 

SATELLITE POWER TRANSMISSION N 258 292 7 54 

SATELLITE ROTATION N 218 916 11 89 

SATELLITE SOLAR ENERGY CONVERSION N 178 293 4 49 

SATELLITE SOLAR POWER STATIONS N 196 396 48 76 

SATELLITE SOUNDING N 356 2052 5 187 

SATELLITE SURFACES N 78 422 1 104 

SATELLITE TELEVISION N 247 1393 20 157 

SATELLITE TEMPERATURE N 136 173 1 34 

SATELLITE TRACKING N 1285 1925 48 1109 

SATELLITE TRANSMISSION N 835 3112 50 322 

SATELLITE -BORNE INSTRUMENTS N 1266 4919 41 524 

SATELLITE-BORNE PHOTOGRAPHY N 1148 3151 61 368 

SATELLITE-BORNE RADAR N 190 346 5 96 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *****•* TYPE STAR IAA NLN OTHER 

SATELLITE-TO-SATELLITE TRACKING N 74 95 0 19 

SATELLITES N 3 18 0 775 

SATURABLE REACTORS N 25 17 2 56 

SATURATION N 128 1285 5 70 

SATURATION (CHEMISTRY) N 77 48 0 33 

SATURN N 9 3 1 7 

SATURN (PLANET) N 348 1033 29 349 

SATURN ATMOSPHERE N 91 484 3 73 

SATURN D LAUNCH VEHICLE N 0 0 0 5 

SATURN LAUNCH VEHICLES N 113 84 10 1448 

SATURN PROJECT N 56 20 14 156 

SATURN RINGS N 195 728 7 124 

SATURN S-1 STAGE N 3 0 0 22 

SATURN S-1B STAGE N 20 4 0 99 

SATURN S-1C STAGE N 25 17 0 116 

SATURN S-2 STAGE N 30 15 0 116 

SATURN S-4 STAGE N 4 3 0 59 

SATURN S-4B STAGE N 103 36 0 465 

SATURN SATELLITES N 33 222 2 50 

SATURN STAGES N 18 7 0 51 

SATURN WORKSHOPS N 10 3 1 15 

SATURN 1 LAUNCH VEHICLES N 13 12 0 74 

SATURN 1 SA-1 LAUNCH VEHICLE N 1 0 0 6 

SATURN 1 SA-10 LAUNCH VEHICLE N 0 0 0 3 

SATURN 1 SA-2 LAUNCH VEHICLE N 1 0 0 8 

SATURN 1 SA-3 LAUNCH VEHICLE N 0 0 0 3 

SATURN 1 SA-4 LAUNCH VEHICLE N 0 0 0 4 

SATURN 1 SA-5 LAUNCH VEHICLE N 2 2 0 10 

SATURN 1 SA-6 LAUNCH VEHICLE N 0 0 0 13 

SATURN 1 SA-7 LAUNCH VEHICLE N 0 0 0 9 

SATURN 1 SA-8 LAUNCH VEHICLE N 0 0 0 2 

SATURN 1 SA-9 LAUNCH VEHICLE N 1 0 0 5 

SATURN 1 WORKSHOP N 2 2 0 17 

SATURN 1B LAUNCH VEHICLES N 49 16 0 236 

SATURN 2 LAUNCH VEHICLES N 2 2 0 13 

SATURN 5 LAUNCH VEHICLES N 190 165 2 916 

SATURN 5 WORKSHOP N 5 1 0 16 

SAUDI ARABIA N 69 85 17 36 

SAUDI ARABIAN SPACE PROGRAM N 0 0 0 2 

SAVANNAH NUCLEAR SHIP N 0 1 2 1 

SAWS N 62 13 6 34 

SAWTOOTH WAVEFORMS N 55 180 1 20 

SC-1 AIRCRAFT N 7 3 0 0 

SC-5 AIRCRAFT N 0 1 0 1 

SC-7 AIRCRAFT N 0 6 0 1 

SCALARS N 612 1514 31 160 

SCALE N 10 17 0 6 

SCALE (CORROSION) N 163 403 3 68 

SCALE (RATIO) N 166 261 6 127 

SCALE EFFECT N 199 340 4 76 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SCALE HEIGHT N 36 325 2 27 

SCALE MODELS N 1659 1118 20 2108 

SCALERS N 71 24 2 89 

SCALING N 81 236 6 51 

SCALING LAWS N 1029 1026 21 502 

SCALLOPING N 4 8 0 7 

SCANDINAVIA N 7 55 5 2 

SCANDIUM N 78 99 5 41 

SCANDIUM COMPOUNDS N 35 63 1 11 

SCANDIUM ISOTOPES N 28 14 1 6 

SCANDIUM OXIDES N 9 39 0 5 

SCANNER PROJECT N 3 2 0 0 

SCANNERS N 599 515 36 592 

SCANNING N 671 776 78 513 

SCANNING TUNNELING MICROSCOPY N 37 151 0 2 

SCAPULA N 2 1 0 0 

SCARFING N 7 26 0 10 

SCARS N 4 4 0 1 

SCATHA SATELLITE N 74 87 0 13 

SCATTER PLATES (OPTICS) N 7 10 0 2 

SCATTER PROPAGATION N 236 350 10 134 

SCATTERING N 1350 397 219 941 

SCATTERING AMPLITUDE N 646 300 7 151 

SCATTERING COEFFICIENTS N 347 981 0 135 

SCATTERING CROSS SECTIONS N 2983 3075 48 907 

SCATTERING FUNCTIONS N 238 796 12 77 

SCA TTEROMETERS N 453 487 1 172 

SCAVENGING N 129 122 5 49 

SCENE ANALYSIS N 390 782 15 94 

SCENEDESMUS N 7 13 0 2 

SCHACH EFFECT N 0 4 0 1 

SCHAUDER FIXPOINT THEOREM N 12 22 0 7 

SCHEDULES N 226 86 20 410 

SCHEDULING N 1081 638 94 1173 

SCHEELITE N 12 4 3 1 

SCHELKUNOFF PRINCIPLE N 3 14 0 2 

SCHIST N 25 11 4 13 

SCHIZOPHRENIA N 8 21 4 6 

SCHLEICHER AIRCRAFT N 0 2 0 0 

SCHLIEREN PHOTOGRAPHY N 585 1446 13 304 

SCHMIDT CAMERAS N 109 230 1 45 

SCHMIDT METHOD N 9 32 0 5 

SCHMIDT NUMBER N 36 180 0 8 

SCHMIDT TELESCOPES N 67 383 7 7 

SCHOOLS N 177 57 123 231 

SCHOOLS (FISH) N 8 3 0 2 

SCHOTTKY DIODES N 591 2592 27 409 

SCHREIBERSITE N 1 46 0 1 

SCHROEDINGER EQUATION N 603 1431 45 196 

SCHULER TUNING N 8 16 0 4 
NASA COMBINED FILE POSTING STATISTICS 

910117 

 •**  SUBJECT TERM ***"'*** TYPE STAR IAA NLN OTHER 

SCHUMANN-RUNGE BANDS N 41 146 1 9 

SCHWARTZ INEQUALITY N 25 59 1 7 

SCHWARTZ METHOD N 8 38 0 2 

SCHWARZ-CHRISTOFFEL TRANSFORMATION N 18 76 2 2 

SCHWARZSCHILD ANTENNAS N 3 8 0 3 

SCHWARZSCHILD METRIC N 71 874 3 28 

SCHWASSMANN-WACHMANN COMET N 3 36 0 2 

SCIATIC REGION N 5 18 0 2 

SCIENCE N 251 42 1274 355 

SCIENTIFIC SATELLITES N 514 627 60 451 

SCIENTISTS N 575 91 728 898 

SCIMITAR AIRCRAFT N 3 0 0 0 

SCINTILLATION N 667 1909 11 356 

SCINTILLATION COUNTERS N 1077 1297 31 459 

SCOOPS N 14 13 0 21 

SCORE SATELLITE N 0 2 0 1 

SCORING N 74 29 0 73 

SCORPIUS CONSTELLATION N 34 188 1 20 

SCOTCHLITE (TRADEMARK) N 2 1 0 0 

SCOTLAND N 30 38 3 12 

SCOUT LAUNCH VEHICLE N 72 38 0 141 

SCOUT PROJECT N 10 8 0 25 

SCRAM N 1 1 0 8 

SCRAMBLING (COMMUNICATION) N 40 35 4 21 

SCRAP N 48 74 12 38 

SCRAPERS N 6 5 0 9 

SCREEN EFFECT N 51 636 5 12 

SCREENING N 35 149 0 37 

SCREENS N 87 361 6 59 

SCREW DISLOCATIONS N 80 262 3 34 

SCREW PINCH N 13 3 0 1 

SCREWS N 113 71 22 137 

SCRUBBERS N 245 98 7 155 

SCUTUM CONSTELLATION N 14 21 1 6 

SCYLLA N 25 12 0 1 

SDS 900 SERIES COMPUTERS N 2 0 0 3 

SDS 930 COMPUTER N 3 0 0 7 

SDS 9300 COMPUTER N 1 0 0 1 

SE-210 AIRCRAFT N 9 21 0 4 

SE-3160 HELICOPTER N 3 2 0 0 

SEA BREEZE N 64 145 1 17 

SEA GRASSES N 23 9 6 14 

SEA ICE N 855 719 35 604 

SEA KEEPING N 5 7 0 3 

SEA LAUNCHING N 32 17 0 133 

SEA LAW N 3 12 7 13 

SEA LEVEL N 310 385 8 156 

SEA OF JAPAN N 22 23 2 20 

SEA OF OKHOTSK N 14 24 0 14 

SEA ROUGHNESS N 145 245 6 105 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SEA STATES N 464 467 6 318 

SEA SURFACE TEMPERATURE N 250 733 0 161 

SEA TRUTH N 92 248 0 48 

SEA URCHINS N 6 4 1 7 

SEA WATER N 1570 948 143 1552 

SEAFARER PROJECT N 2 1 0 6 

SEALERS N 186 115 35 401 

SEALING N 278 217 54 452 

SEALS (ANIMALS) N 2 4 1 5 

SEALS (STOPPERS) N 802 799 37 1129 

SEAMOUNTS N 37 44 0 34 

SEAMS (JOINTS) N 88 66 5 74 

SEAPLANES N 28 44 37 31 

SEARCH PROFILES N 308 144 40 146 

SEARCH RADAR N 214 176 0 1359 

SEARCHING N 579 517 56 364 

SEARCHLIGHTS N 30 7 0 59 

SEAS N 228 55 61 235 

SEASAT PROGRAM N 72 28 4 48 

SEASAT SATELLITES N 278 674 3 130 

SEASAT 1 N 162 176 1 54 

SEASAT-B SATELLITE N 2 0 0 0 

SEASONS N 327 79 6 182 

SEAT BELTS N 107 62 3 68 

SEATS N 265 240 7 196 

SEAWEEDS N 30 38 3 23 

SEBACEOUS GLANDS N 1 0 1 0 

SEBACIC ACID N 3 0 0 5 

SECONDARY COSMIC RAYS N 84 429 1 11 

SECONDARY EMISSION N 401 668 1 1 187 

SECONDARY FLOW N 398 1021 5 119 

SECONDARY INJECTION N 67 83 0 81 

SECONDARY RADAR N 49 225 2 15 

SECRETIONS N 50 48 17 64 

SECTIONS N 8 12 3 11 

SECTORS N 8 39 1 6 

SECULAR VARIATIONS N 92 1811 4 36 

SECURITY N 376 81 167 600 

SEDATIVES N 29 15 1 10 

SEDIMENT TRANSPORT N 430 120 59 325 

SEDIMENTARY ROCKS N 315 172 61 232 

SEDIMENTS N 1750 573 239 1448 

SEEBECK EFFECT N 95 109 1 64 

SEEDS N 128 109 15 121 

SEEING (ASTRONOMY) N 2 58 0 0 

SEEPAGE N 39 24 12 49 

SEGMENTS N 274 258 4 120 

SEGRE CHARACTERISTIC N 0 1 0 0 

SEISMIC ENERGY N 178 76 9 161 

SEISMIC WAVES N 1530 362 65 1389 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM "*~***** TYPE STAR IAA NLN OTHER 

SEISMOCARDIOGRAPHY N 8 11 0 0 

SEISMOGRAMS N 123 44 4 113 

SEISMOGRAPHS N 477 119 17 617 

SEISMOLOGY N 1595 705 174 1445 

SEIZURES N 3 27 0 4 

SEL COMPUTERS N 8 2 0 2 

SELECTION N 556 149 58 424 

SELECTION RULES (NUCLEAR PHYSICS) N 19 7 0 2 

SELECTIVE DISSEMINATION OF INFORMATION N 250 35 35 171 

SELECTIVE FADING N 42 28 0 2 

SELECTIVE SURFACES N 13 94 1 5 

SELECTIVITY N 71 189 8 28 

SELECTORS N 26 63 2 22 

SELENIDES N 168 317 4 88 

SELENIUM N 227 242 27 146 

SELENIUM ALLOYS N 14 27 2 6 

SELENIUM COMPOUNDS N 75 90 6 38 

SELENIUM ISOTOPES N 1 4 0 0 

SELENIUM OXIDES N 3 2 1 4 

SELENOGRAPHY N 64 232 25 68 

SELENOLOGY N 109 756 41 98 

SELF ABSORPTION N 40 190 0 12 

SELF ADAPTIVE CONTROL SYSTEMS N 253 488 15 67 

SELF ALIGNMENT N 69 317 1 53 

SELF CALIBRATING OMNIRANGE N 0 1 0 0 

SELF CONSISTENT FIELDS N 207 1097 18 91 

SELF DIFFUSION (SOLID STATE) N 58 152 5 8 

SELF ERECTING DEVICES N 35 45 0 34 

SELF EXCITATION N 68 596 3 29 

SELF FOCUSING N 119 847 1 38 

SELF INDUCED VIBRATION N 41 148 4 16 

SELF LUBRICATING MATERIALS N 49 113 2 35 

SELF LUBRICATION N 55 76 1 42 

SELF MANEUVERING UNITS N 30 20 0 21 

SELF ORGANIZING SYSTEMS N 118 266 42 60 

SELF OSCILLATION N 73 1394 16 34 

SELF PROPAGATION N 25 58 0 7 

SELF REPAIRING DEVICES N 30 103 0 14 

SELF SEALING N 23 19 1 38 

SELF SHADOWING N 0 3 0 0 

SELF STIMULATION N 6 32 11 9 

SELF SUSTAINED EMISSION N 5 73 0 6 

SELF TESTS N 103 233 0 32 

SEMANTICS N 1361 177 123 374 

SEMICIRCULAR CANALS N 132 153 6 45 

SEMICONDUCTING FILMS N 642 2126 34 340 

SEMICONDUCTOR DEVICES N 3059 3633 734 4234 

SEMICONDUCTOR DIODES N 190 1330 16 186 

SEMICONDUCTOR JUNCTIONS N 572 1226 44 341 

SEMICONDUCTOR LASERS N 494 3449 49 405 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ***'  TYPE STAR IAA NLN OTHER 

SEMICONDUCTOR PLASMAS N 28 305 3 30 

SEMICONDUCTORS (MATERIALS) N 3930 4411 823 3060 1

SEMIEMPIRICAL EQUATIONS N 68 346 3 22 

SEMIREGULAR VARIABLE STARS N 9 89 0 0 

SEMISOLIDS N 3 5 0 2 

SEMISPAN MODELS N 49 23 0 26 

SENARMONT POLARISCOPES N 0 1 0 0 

SENEGAL N 20 30 2 13 

SENSE ORGANS N 44 41 40 113 

SENSITIVITY N 2090 2676 57 1661 

SENSITIZING N 65 63 5 31 

SENSITOMETRY N 28 47 8 13 

SENSORIMOTOR PERFORMANCE N 282 785 33 117 

SENSORS N 453 1043 32 698 

SENSORY DEPRIVATION N 38 89 7 13 

SENSORY DISCRIMINATION N 77 98 18 36 

SENSORY FEEDBACK N 92 147 8 39 

SENSORY PERCEPTION N 290 312 124 240 

SENSORY STIMULATION N 170 332 10 65 

SENTENCES N 44 10 27 18 

SENTINEL SYSTEM N 1 2 0 35 

SEOCS (SATELLITE) N 6 4 0 0 

SEPAC (PAYLOAD) N 9 25 0 1 1 

SEPARATED FLOW N 1863 3532 34 969 

SEPARATION N 284 359 49 450 

SEPARATORS N 635 261 22 403 

SEPTUM N 11 30 1 4 

SEQUENCING N 1073 264 51 690 

SEQUENTIAL ANALYSIS N 575 873 45 201 

SEQUENTIAL COMPUTERS N 164 108 53 55 

SEQUENTIAL CONTROL N 350 386 44 195 

SERGEANT MISSILES N 0 1 0 22 

SERGENIUM N 1 0 0 0 

SERIES (MATHEMATICS) N 518 1855 113 200 

SERIES EXPANSION N 409 1181 6 79 

SEROTONIN N 32 125 4 22 

SERPENTINE N 19 28 5 14 

SERRATIA N 1 7 0 1 

SERT 1 SPACECRAFT N 1 0 0 1 

SERT 2 SPACECRAFT N 54 39 0 10 

SERUMS N 101 145 14 154 

SERVICE LIFE N 2169 4147 42 4001 1

SERVICE MODULES N 97 85 0 345 

SERVICES N 193 115 208 265 

SERVOAMPLIFIERS N 35 30 3 53 

SERVOCONTROL N 338 1207 29 218 

SERVOMECHANISMS N 709 823 143 754 

SERVOMOTORS N 147 211 14 141 

SET N 7 2 3 14 

SET THEORY N 2120 1374 285 1065 
NASA COMBINED FILE POSTING STATISTICS 

910117 

** ***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SETTING N 2 5 0 5 

SETTLING N 81 40 3 41 

SETUPS N 7 1 1 12 

SEWAGE N 254 76 142 291 

SEWAGE TREATMENT N 440 91 63 396 

SEWERS N 15 2 4 7 

SEWING N 10 11 1 21 

SEX N 30 39 42 33 

SEX FACTOR N 67 180 65 34 

SEX GLANDS N 7 6 4 5 

SEXTANTS N 35 34 0 36 

SEYCHELLES N 6 4 22 0 

SEYFERT GALAXIES N 235 2109 4 57 

SH WAVES N 50 86 0 6 

SH-3 HELICOPTER N 19 17 0 57 

SH-4 HELICOPTER N 0 1 0 0 

SHACKLETON BOMBER N 0 0 0 

SHADES N 30 25 2 17 

SHADOWGRAPH PHOTOGRAPHY N 247 714 4 124 

SHADOWS N 200 425 5 100 

SHAFTS (MACHINE ELEMENTS) N 635 574 22 554 

SHAKERS N 81 119 1 43 

SHAKING N 32 12 0 16 

SHALE OIL N 455 227 59 361 

SHALES N 181 65 28 184 

SHALLOW SHELL EQUATIONS N 31 653 1 8 

SHALLOW SHELLS N 25 661 2 11 

SHALLOW WATER N 278 344 5 166 

SHANNON-WIENER MEASURE N 13 7 1 0 

SHAPE CONTROL N 103 226 1 56 

SHAPE MEMORY ALLOYS N 48 285 0 24 

SHAPED CHARGES N 112 46 2 212 

SHAPERS N 14 16 5 21 

SHAPES N 1101 1083 68 686 

SHARKS N 11 4 2 16 

SHARP LEADING EDGES N 115 256 0 46 

SHARPNESS N 9 39 0 6 

SHATTER CONES N 8 1 0 1 

SHEAR N 35 63 3 16 

SHEAR CREEP N 27 57 1 12 

SHEAR FLOW N 926 2924 36 360 

SHEAR LAYERS N 581 1686 12 230 

SHEAR PROPERTIES N 928 1445 27 523 

SHEAR STRAIN N 239 1386 9 89 

SHEAR STRENGTH N 578 1407 19 460 

SHEAR STRESS N 2255 6957 38 1090 1

SHEARING N 74 88 4 40 

SHEARS N 8 4 1 7 

SHEATHS N 77 37 1 74 

SHEDDING N 18 32 0 4 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SHEDS N 2 1 0 1 

SHEEP N 24 33 3 39 

SHEETS N 44 1 1 1 4 44 

SHELL ANODES N 3 3 0 1 

SHELL STAB! LITY N 298 3969 36 138 

SHELL STARS N 24 181 0 7 

SHELL THEORY N 646 4652 94 224 

SHELLFISH N 21 8 1 30 

SHELLS (STRUCTURAL FORMS) N 988 531 125 657 

SHELTERS N 136 19 17 240 

SHELVES N 1 1 0 2 

SHENANDOAH VALLEY (VA) N 0 1 0 0 

SHIELDING N 398 142 19 479 

SHIFT N 5 22 1 4 

SHIFT REG! STERS N 373 404 17 454 

SHIFTING EQUILIBRIUM FLOW N 4 3 0 1 

SHILLELAGH MISSILES N 2 1 0 62 

SHIP HULLS N 278 77 11 544 

SHIP TERMINALS N 21 129 2 20 

SHIP TO SHORE COMMUNICATION N 14 16 0 5 

SHIPS N 1435 755 172 3011 

SHIPYARDS N 20 1 5 54 

SHIVA LASER SYSTEM N 16 27 1 9 

SHIVERING N 17 59 0 1 

SHOALS N 23 17 2 18 

SHOCK N 50 21 16 54 

SHOCK (PHYSIOLOGY) N 28 47 6 64 

SHOCK ABSORBERS N 244 236 8 228 

SHOCK DISCONTINUITY N 93 540 1 18 

SHOCK FRONTS N 311 2083 6 90 

SHOCK HEATING N 145 1041 1 56 

SHOCK LAYERS N 291 917 2 193 

SHOCK LOADS N 473 691 9 378 

SHOCK MEASURING INSTRUMENTS N 90 93 7 72 

SHOCK RESISTANCE N 238 249 9 595 

SHOCK SIMULATORS N 45 37 1 43 

SHOCK SPECTRA N 176 121 3 91 

SHOCK TESTS N 361 326 11 889 

SHOCK TUBES N 1034 2540 43 600 

SHOCK TUNNELS N 167 320 3 113 

SHOCK WAVE ATTENUATION N 112 262 1 58 

SHOCK WAVE CONTROL N 26 41 0 22 

SHOCK WAVE GENERATORS N 90 331 0 41 

SHOCK WAVE INTERACTION N 640 2825 9 266 

SHOCK WAVE LUMINESCENCE N 18 88 0 9 

SHOCK WAVE PROFILES N 224 939 2 77 

SHOCK WAVE PROPAGATION N 716 5147 15 278 

SHOCK WAVES N 4734 6716 211 3025 1

SHOES N 31 8 1 56 

SHOPS N 19 10 9 84 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *.t;•**** TYPE STAR IAA NLN OTHER 

SHORAN N 7 19 0 9 

SHORELINES N 240 82 41 172 

SHORT CIRCUIT CURRENTS N 26 306 1 7 

SHORT CIRCUITS N 262 757 13 188 

SHORT CRACKS N 22 109 0 1 

SHORT HAUL AIRCRAFT N 277 360 10 214 

SHORT RANGE BALLISTIC MISSILES N 6 10 0 65 

SHORT TAKEOFF AIRCRAFT N 1020 1088 48 1089 

SHORT WAVE RADIATION N 206 565 10 199 

SHORT WAVE RADIO TRANSMISSION N 86 690 22 61 

SHOT N 3 2 0 0 

SHOT NOISE N 76 348 3 24 

SHOT PEENING N 53 117 3 37 

SHOULDERS N 24 18 0 15 

SHOWERS N 13 20 0 4 

SHRAPNEL N 13 2 0 10 

SHREDDING N 14 39 0 8 

SHREWS N 0 0 1 0 

SHRIKE MISSILE N 1 0 0 89 

SHRINKAGE N 203 248 5 133 

SHROUDED NOZZLES N 36 30 0 17 

SHROUDED PROPELLERS N 44 47 0 33 

SHROUDED TURBINES N 32 155 2 15 

SHROUDS N 156 161 0 157 

SHUTDOWNS N 98 38 3 108 

SHUTTERS N 30 140 0 27 

SHUTTLE DERIVED VEHICLES N 25 40 1 39 

SHUTTLE ENGINEERING SIMULATOR N 3 1 0 2 

SHUTTLE IMAGING RADAR N 209 295 1 34 

SHUTTLE MISSION SIMULATOR N 2 15 0 6 

SHUTTLE PALLET SATELLITES N 26 40 0 9 

SIALON N 13 164 0 4 

SIAM MISSILES N 0 0 0 13 

SIBERIA N 89 282 7 66 

SICILY N 12 21 1 4 

SICKNESSES N 20 37 2 21 

SIDE INLETS N 10 7 0 14 

SIDE-LOOKING RADAR N 316 577 8 336 

SIDEBANDS N 118 308 3 69 

SIDELOBE REDUCTION N 116 1044 1 88 

SIDELOBES N 315 637 2 277 

SIDEREAL TIME N 34 119 5 6 

SIDERITES N 11 41 1 4 

SIDES N 45 6 0 59 

SIDESLIP N 291 209 2 342 

SIDEWINDER MISSILES N 10 14 0 333 

SIEBEL AIRCRAFT N 1 0 0 0 

SIEMENS 2002 COMPUTER N 3 0 0 1 

SIERRA LEONE N 2 6 1 0 

SIERRA NEVADA MOUNTAINS (CA) N 129 44 16 19 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SIEVES N 62 31 9 45 

SIGMA COMPUTERS N 2 3 0 2 

SIGMA ORIONIS N 1 1 0 0 

SIGMA 5 COMPUTER N 3 0 0 1 

SIGMA 7 N 2 1 0 0 

SIGMA 9 COMPUTER N 3 0 0 0 

SIGMA-MESONS N 6 0 0 2 

SIGNAL ANALYSIS N 950 3702 88 559 

SIGNAL ANALYZERS N 208 334 3 165 

SIGNAL DETECTION N 1123 3306 58 862 

SIGNAL DETECTORS N 367 962 10 311 

SIGNAL DISTORTION N 471 2237 12 203 

SIGNAL ENCODING N 416 1948 16 182 

SIGNAL FADING N 541 1757 7 143 

SIGNAL FADING RATE N 21 65 0 6 

SIGNAL FLOW GRAPHS N 36 337 11 26 

SIGNAL GENERATORS N 300 548 22 338 

SIGNAL MEASUREMENT N 287 2053 16 215 

SIGNAL MIXING N 89 901 1 50 

SIGNAL PROCESSING N 6317 11263 430 5703 2

SIGNAL RECEPTION N 561 2329 13 394 

SIGNAL REFLECTION N 325 1167 2 170 

SIGNAL STABILIZATION N 91 594 3 37 

SIGNAL TO NOISE RATIOS N 4191 11470 66 2748 1

SIGNAL TRANSMISSION N 1172 2263 73 694 

SIGNALS N 59 25 14 61 

SIGNATURE ANALYSIS N 391 457 5 427 

SIGNATURES N 166 29 2 389 

SIGNIFICANCE N 51 59 6 14 

SIGNS AND SYMPTOMS N 135 465 32 150 

SIKHOTE-ALIN METEORITE N 4 50 0 1 

SIKKIM N 0 0 0 0 

SIKORSKY AIRCRAFT N 15 93 2 18 

SIKORSKY WHIRLWIND HELICOPTER N 4 3 0 3 

SILANES N 377 365 9 181 

SILENCE N 3 1 1 3 

SILENCERS N 35 74 1 9 

SILICA GEL N 82 27 0 25 

SILICA GLASS N 191 421 11 91 

SILICATES N 597 1315 58 307 

SILICIDES N 187 466 7 127 

SILICON N 4622 4505 164 3908 1

SILICON ALLOYS N 381 1104 1 151 

SILICON CARBIDES N 1227 2999 15 1009 

SILICON COMPOUNDS N 478 336 28 316 

SILICON CONTROLLED RECTIFIERS N 82 81 14 191 

SILICON DIOXIDE N 1082 1587 33 774 

SILICON FILMS N 363 871 8 183 

SILICON ISOTOPES N 48 71 1 14 

SILICON JUNCTIONS N 181 2208 8 129 
NASA COMBINED FILE POSTING STATISTICS 

910117 

•••  SUBJECT TERM ** '***** TYPE STAR IAA NLN OTHER 

SILICON NITRIDES N 835 2016 16 459 

SILICON OXIDES N 335 833 11 193 

SILICON POLYMERS N 115 50 3 86 

SILICON RADIATION DETECTORS N 95 299 1 48 

SILICON TETRACHLORIDE N 19 23 0 16 

SILICON TRANSISTORS N 154 602 9 516 

SILICONE RESINS N 80 64 1 89 

SILICONE RUBBER N 88 84 2 113 

SILICONES N 294 205 23 319 

SILICONIZING N 27 50 1 37 

SILK N 3 7 3 12 

SILKWORMS N 0 3 0 1 

SILOXANES N 197 95 3 109 

SILVER N 1026 732 30 601 

SILVER ALLOYS N 189 124 6 101 

SILVER BROMIDES N 37 30 1 14 

SILVER CADMIUM BATTERIES N 64 12 0 57 

SILVER CHLORIDES N 78 29 2 50 

SILVER COMPOUNDS N 157 87 6 91 

SILVER HALIDES N 39 84 11 28 

SILVER HYDROGEN BATTERIES N 12 6 0 3 

SILVER IODIDES N 127 86 0 80 

SILVER ISOTOPES N 22 12 0 6 

SILVER NITRATES N 34 20 0 10 

SILVER OXIDES N 48 52 1 45 

SILVER ZINC BATTERIES N 196 97 3 214 

SILVICULTURE N 21 10 1 16 

SIM N 25 18 2 17 

SIMD (COMPUTERS) N 45 132 0 8 

SIMILARITY NUMBERS N 27 88 1 11 

SIMILARITY THEOREM N 213 1244 18 51 

SIMILITUDE LAW N 57 174 6 20 

SIMPLE HARMONIC MOTION N 5 35 1 0 

SIMPLEX METHOD N 79 25 2 12 

SIMPLIFICATION N 113 33 4 119 

SIMULATION N 4243 1160 198 3681 

SIMULATORS N 798 233 36 1060 

SIMULTANEOUS EQUATIONS N 117 416 38 75 

SINE SERIES N 23 68 3 14 

SINE WAVES N 535 1288 19 258 

SINGAPORE N 4 15 4 10 

SINGLE CHANNEL PER CARRIER TRANSMISSION N 28 118 0 3 

SINGLE CRYSTALS N 3777 6562 86 2431 1

SINGLE ENGINE AIRCRAFT N 2 4 0 0 

SINGLE EVENT UPSETS N 45 158 0 34 

SINGLE SIDEBAND TRANSMISSION N 119 226 6 143 

SINGLE STAGE ROCKET VEHICLES N 18 55 0 15 

SINGLE STAGE TO ORBIT VEHICLES N 35 192 1 21 

SINGLE-PHASE FLOW N 47 71 4 24 

SINGULAR INTEGRAL EQUATIONS N 64 1065 8 15 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SINGULARITY (MATHEMATICS) N 637 3604 43 109 

SINKHOLES N 4 4 0 1 

SINKING N 13 5 0 18 

SINKS N 72 103 0 34 

SINTERED ALUMINUM POWDER N 56 68 1 31 

SINTERING N 1440 2741 75 910 

SINUSES N 9 34 0 2 

SIPHONING N 1 7 0 0 

SIPHONS N 9 9 0 3 

SIRENS N 4 9 0 5 

SIRIO SATELLITE N 83 253 1 11 

SIRS B SATELLITE N 7 5 0 1 

SIS (SEMICONDUCTORS) N 12 126 1 3 

SIS (SUPERCONDUCTORS) N 27 120 0 12 

SISO (CONTROL SYSTEMS) N 38 241 0 3 

SITE DATA PROCESSORS N 12 30 0 19 

SITE SELECTION N 866 322 26 534 

SITES N 436 272 32 671 

SITTING POSITION N 62 115 2 15 

SIZE (DIMENSIONS) N 597 725 9 620 

SIZE DETERMINATION N 265 1062 26 219 

SIZE DISTRIBUTION N 194 344 1 76 

SIZE SEPARATION N 58 36 6 34 

SIZING N 15 34 1 8 

SIZING (SHAPING) N 20 68 2 17 

SIZING (SURFACE TREATMENT) N 20 9 1 5 

SIZING MATERIALS N 11 0 2 5 

SIZING SCREENS N 12 5 4 11 

SKEWNESS N 170 336 8 58 

SKID LANDINGS N 16 17 1 19 

SKIDDING N 173 30 9 146 

SKIN (ANATOMY) N 310 304 55 225 

SKIN (STRUCTURAL MEMBER) N 239 435 7 458 

SKIN FRICTION N 754 2040 10 435 

SKIN GRAFTS N 5 3 0 8 

SKIN RESISTANCE N 39 199 2 20 

SKIN TEMPERATURE (BIOLOGY) N 108 472 2 43 

SKIN TEMPERATURE (NON-BIOLOGICAL) N 51 68 0 73 

SKINNER BOXES N 2 2 0 1 

SKIRTS N 56 119 1 114 

SKIS N 15 10 0 10 

SKUA ROCKET VEHICLES N 12 15 0 1 

SKULL N 20 26 2 12 

SKY N 57 27 15 58 

SKY BRIGHTNESS N 241 618 6 128 

SKY RADIATION N 136 369 0 81 

SKY SURVEYS (ASTRONOMY) N 161 1177 0 23 

SKY WAVES N 89 172 3 64 

SKYBOLT MISSILE N 0 0 0 6 

SKYDROL (TRADEMARK) N 2 0 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SKYHOOK BALLOONS N 13 10 1 11 

SKYLAB PROGRAM N 2204 1247 94 794 

SKY LAB 1 N 52 33 2 31 

SKYLAB 2 N 33 17 1 21 

SKYLAB 3 N 40 48 0 28 

SKYLAB 4 N 64 31 0 20 

SKYLARK ROCKET VEHICLE N 110 136 1 13 

SKYNET SATELLITES N 17 48 3 29 

SL-3 ROCKET ENGINE N 1 0 0 0 

SLABS N 208 628 21 96 

SLAGS N 196 167 12 145 

SLAMMING N 2 1 0 1 

SLATER ORBITALS N 42 54 1 34 

SLEDS N 39 23 0 46 

SLEEP N 299 523 80 164 

SLEEP DEPRIVATION N 168 196 9 73 

SLEEVES N 78 29 0 91 

SLENDER BODIES N 396 1016 8 280 

SLENDER CONES N 91 257 1 71 

SLENDER WINGS N 217 419 3 145 

SLEUTH (PROGRAMMING LANGUAGE) N 0 0 0 7 

SLEWING N 94 119 0 62 

SLICING N 67 26 2 30 

SLIDES (MICROSCOPY) N 3 2 2 0 

SLIDING N 210 172 5 87 

SLIDING CONTACT N 31 362 7 21 

SLIDING FRICTION N 575 997 17 157 

SLIP N 23 368 1 22 

SLIP CASTING N 47 76 3 41 

SLIP FLOW N 91 340 1 38 

SLIPSTREAMS N 77 123 0 52 

SLITS N 108 288 2 29 

SLIVERS N 0 1 0 2 

SLOPES N 417 285 28 255 

SLOT ANTENNAS N 277 841 6 198 

SLOTS N 283 589 0 178 

SLOTTED WINO TUNNELS N 112 71 1 37 

SLUDGE N 306 103 43 263 

SLUMPING N 7 7 0 2 

SLURRIES N 400 110 15 383 

SLURRY PROPELLANTS N 51 39 0 174 

SLUSH N 49 29 1 46 

SLUSH HYDROGEN N 1 3 0 1 

SMALL PERTURBATION FLOW N 84 1044 3 15 

SMALL SCIENTIFIC SATELLITES N 39 78 0 12 

SMALLPOX N 3 4 1 0 

SMART STRUCTURES N 2 64 0 1 

SMEAR N 8 25 0 6 

SMELTING N 86 54 15 101 

SMITH CHART N 7 67 4 1 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SMOG N 166 223 20 51 

SMOKE N 694 551 51 BOO 

SMOKE ABATEMENT N 66 74 3 155 

SMOKE DETECTORS N 35 17 0 36 

SMOKE TRAILS N 47 127 3 37 

SMOOTHING N 203 105 6 54 

SMS 1 N 2 28 0 2 

SMS 2 N 11 17 0 4 

SNAILS N 9 7 0 6 

SNAKES N 2 6 6 13 

SNAP N 84 34 3 318 

SNAP 1 N 1 0 0 1 

SNAP 10A N 9 7 0 118 

SNAP 11 N 0 2 0 21 

SNAP 13 N 0 1 0 10 

SNAP 15 N 2 1 0 13 

SNAP 17 N 0 0 0 13 

SNAP 19 N 26 27 1 114 

SNAP 2 N 6 0 0 83 

SNAP 21 N 18 4 0 22 

SNAP 23 N 36 2 0 14 

SNAP 27 N 16 15 0 84 

SNAP 29 N 3 5 0 35 

SNAP 3 N 0 1 0 6 

SNAP 4 N 3 0 0 11 

SNAP 50 N 1 1 0 105 

SNAP 7 N 0 0 0 9 

SNAP 8 N 114 19 0 232 

SNAP 9A N 4 1 0 23 

SNAPSHOT SATELLITE N 12 1 0 5 

SNAPTRAN REACTOR N 1 1 0 4 

SNEAK CIRCUIT ANALYSIS N 8 21 1 4 

SNEEZING N 0 1 0 0 

SNELLEN TESTS N 3 4 0 3 

SNELLS LAW N 41 103 0 13 

SNOW N 1102 494 40 530 

SNOW AIRCRAFT N 0 0 0 1 

SNOW COVER N 690 604 12 252 

SNOWSTORMS N 29 64 0 6 

SOAKING N 6 12 0 5 

SOAPS N 38 32 11 19 

SOARING N 14 22 37 8 

SOBDLEV SPACE N 38 82 1 1 

SOCIAL FACTORS N 1145 853 1033 792 

SOCIAL ISOLATION N 50 114 8 31 

SOCIAL PSYCHIATRY N 15 21 43 12 

SOCIOLOGY N 343 88 790 354 

SOCKS N 4 0 0 1 

SOD N 0 0 1 2 

SODA LITE N 1 7 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**•  SUBJECT TERM ** ***** TYPE STAR IAA NLN OTHER 

SODAR N 36 85 0 3 

SODIUM N 1253 1527 17 714 

SODIUM ALLOYS N 44 21 1 12 

SODIUM AZIDES N 15 4 0 13 

SODIUM BROMIDES N 16 3 0 4 

SODIUM CARBONATES N 68 43 1 37 

SODIUM CHLORIDES N 611 790 22 289 

SODIUM CHLORODIFLUOROACETATES N 1 0 0 0 

SODIUM CHROMITES N 2 3 1 1 

SODIUM COMPOUNDS N 369 306 3 267 

SODIUM COOLING N 187 33 2 82 

SODIUM FLUORIDES N 79 54 0 30 

SODIUM GALLATES N 0 0 0 1 

SODIUM GRAPHITE REACTORS N 4 1 1 6 

SODIUM HYDRIDES N 6 22 0 8 

SODIUM HYDROXIDES N 115 100 0 59 

SODIUM IODIDES N 121 81 1 31 

SODIUM ISOTOPES N 45 37 1 9 

SODIUM NITRATES N 58 68 0 41 

SODIUM PEROXIDES N 5 3 0 4 

SODIUM REACTOR EXPERIMENT N 30 1 0 16 

SODIUM SALICYLATES N 8 14 0 4 

SODIUM SILICATES N 43 27 0 28 

SODIUM SULFATES N 86 127 0 19 

SODIUM SULFITE$ N 21 11 0 10 

SODIUM SULFUR BATTERIES N 92 137 0 35 

SODIUM VAPOR N 71 217 1 49 

SODIUM 22 N 17 55 0 4 

SODIUM 24 N 8 8 0 4 

SOFIA (AIRBORNE OBSERVATORY) N 0 0 0 1 

SOFT LANDING N 67 112 5 62 

SOFT LANDING SPACECRAFT N 42 55 4 32 

SOFTENING N 90 178 2 29 

SOFTNESS N 10 14 0 12 

SOFTWARE ENGINEERING N 1782 748 111 770 

SOFTWARE TOOLS N 1205 1373 39 461 

SOHO MISSION N 43 38 0 12 

SOl (SEMICONDUCTORS) N 16 78 0 3 

SOIL EROSION N 184 136 21 160 

SOIL MAPPING N 369 743 37 119 

SOIL MECHANICS N 710 164 161 739 

SOIL MOISTURE N 896 700 38 353 

SOIL SCIENCE N 596 453 169 437 

SOILS N 1951 496 213 1489 

SOL-GEL PROCESSES N 96 77 0 43 

SOLAR ACTIVITY N 1540 3106 110 881 

SOLAR ACTIVITY EFFECTS N 761 5583 37 173 

SOLAR ARRAYS N 1981 1986 23 675 

SOLAR ATMOSPHERE N 449 3214 35 279 

SOLAR ATRIUMS N 4 0 0 1 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SOLAR AUXILIARY POWER UNITS N 29 20 0 26 

SOLAR BACKSCATTER UV SPECTROMETER N 4 30 0 2 

SOLAR BLANKETS N 47 17 0 13 

SOLAR CELL CALIBRATION FACILITY N 1 1 0 3 

SOLAR CELLS N 4383 6905 149 2225 1

SOLAR COLLECTORS N 2515 3762 125 1446 

SOLAR COMPASSES N 6 2 0 3 

SOLAR CONSTANT N 164 288 7 41 

SOLAR COOLING N 474 526 59 373 

SOLAR CORONA N 1011 4784 42 439 

SOLAR CORPUSCULAR RADIATION N 133 837 3 54 

SOLAR COSMIC RAYS N 369 1401 11 109 

SOLAR CYCLES N 621 2686 11 159 

SOLAR DIAMETER N 30 58 0 8 

SOLAR DYNAMIC POWER SYSTEMS N 112 181 0 31 

SOLAR ECLIPSES N 256 1105 39 205 

SOLAR ELECTRIC PROPULSION N 145 293 1 130 

SOLAR ELECTRONS N 81 624 2 40 

SOLAR ENERGY N 2442 953 603 1944 

SOLAR ENERGY ABSORBERS N 246 791 9 123 

SOLAR ENERGY CONVERSION N 2201 3403 229 1300 

SOLAR FLARES N 2019 6791 71 894 

SOLAR FLUX N 459 1096 9 172 

SOLAR FLUX DENSITY N 207 756 3 64 

SOLAR FURNACES N 58 129 6 53 

SOLAR GENERATORS N 809 962 82 668 

SOLAR GRANULATION N 48 602 2 10 

SOLAR GRAVITATION N 96 417 1 18 

SOLAR HEATING N 1696 2355 227 1102 

SOLAR HOUSES N 318 610 57 163 

SOLAR INSTRUMENTS N 101 786 5 92 

SOLAR INTERIOR N 90 272 0 15 

SOLAR LIMB N 93 960 3 32 

SOLAR LONGITUDE N 14 93 1 17 

SOLAR MAGNETIC FIELD N 802 4894 28 215 

SOLAR MAXIMUM MISSION N 270 624 2 116 

SOLAR MAXIMUM MISSION-A N 2 2 0 0 

SOLAR MESOSPHERE EXPLORER N 26 95 0 18 

SOLAR NEIGHBORHOOD N 11 206 0 2 

SOLAR NEUTRINOS N 79 365 1 9 

SOLAR NEUTRONS N 75 132 0 13 

SOLAR OBLATENESS N 8 63 0 3 

SOLAR OBSERVATORIES N 248 455 15 206 

SOLAR OPTICAL TELESCOPE N 6 29 1 7 

SOLAR ORBITS N 233 1595 24 84 

SOLAR OSCILLATIONS N 218 929 4 27 

SOLAR PARALLAX N 2 9 0 13 

SOLAR PHYSICS N 777 2083 98 562 

SOLAR PLANETARY INTERACTIONS N 28 315 0 46 

SOLAR PONDS (HEAT STORAGE) N 136 128 5 64 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM >!<*-+<**•* TYPE STAR IAA NLN OTHER 

SOLAR POSITION N 143 855 4 64 

SOLAR POWER SATELLITES N 311 406 15 81 

SOLAR POWERED AIRCRAFT N 12 14 0 5 

SOLAR PROBES N 148 197 1 77 

SOLAR PROMINENCES N 190 1144 5 105 

SOLAR PROPULSION N 58 127 3 58 

SOLAR PROTONS N 415 2066 6 107 

SOLAR RADAR ECHOES N 3 12 0 0 

SOLAR RADIATION N 3105 5092 220 1842 1

SOLAR RADIATION SHIELDING N 36 66 1 21 

SOLAR RADIATION 1 SATELLITE N 0 1 1 0 

SOLAR RADIATION 3 SATELLITE N 1 0 0 0 

SOLAR RADIO BURSTS N 335 1149 5 93 

SOLAR RADIO EMISSION N 457 1253 19 175 

SOLAR REFLECTORS N 380 457 6 162 

SOLAR ROTATION N 227 1299 6 40 

SOLAR SAILS N 61 155 3 37 

SOLAR SEA POWER PLANTS N 31 25 1 37 

SOLAR SENSORS N 194 284 2 173 

SOLAR SIMULATION N 129 202 7 36 

SOLAR SIMULATORS N 203 187 1 65 

SOLAR SPECTRA N 564 4882 41 359 

SOLAR SPECTROMETERS N 111 340 5 78 

SOLAR STORMS N 65 160 6 54 

SOLAR SYSTEM N 735 3949 359 790 

SOLAR SYSTEM EVOLUTION N 0 0 0 0 

SOLAR TEMPERATURE N 61 871 0 18 

SOLAR TERRESTRIAL INTERACTIONS N 438 2739 35 206 

SOLAR THERMAL ELECTRIC POWER PLANTS N 81 91 3 40 

SOLAR THERMAL PROPULSION N 32 15 1 13 

SOLAR TOTAL ENERGY SYSTEMS N 117 90 3 80 

SOLAR VELOCITY N 25 174 0 24 

SOLAR WIND N 2399 8044 76 1012 1

SOLAR WIND VELOCITY N 156 1339 1 38 

SOLAR X-RAYS N 484 2402 10 166 

SOLAR-PUMPED LASERS N 29 40 0 13 

SOLDERED JOINTS N 130 103 8 100 

SOLDERING N 220 149 71 359 

SOLDERS N 77 33 15 40 

SOLENOID VALVES N 49 22 1 114 

SOLENOIDS N 286 359 7 373 

SOLETTAS N 2 2 0 0 

SOLID CRYOGEN COOLING N 4 5 0 0 

SOLID CRYOGENS N 12 12 0 8 

SOLID ELECTRODES N 49 634 5 20 

SOLID ELECTROLYTES N 264 221 8 105 

SOLID LUBRICANTS N 307 509 9 190 

SOLID MECHANICS N 103 289 10 27 

SOLID NITROGEN N 15 27 0 9 

SOLID PHASES N 434 1480 31 250 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SOLID PROPELLANT COMBUSTION N 266 620 1 244 

SOLID PROPELLANT IGNITION N 204 437 2 307 

SOLID PROPELLANT ROCKET ENGINES N 1187 1584 44 4554 

SOLID PROPELLANTS N 441 532 19 1246 

SOLID ROCKET BINDERS N 101 55 0 547 

SOLID ROCKET PROPELLANTS N 1021 669 30 3352 

SOLID SOLUTIONS N 761 3411 44 341 

SOLID STATE N 576 291 260 375 

SOLID STATE DEVICES N 1364 1566 262 1785 

SOLID STATE LASERS N 322 2246 22 325 

SOLID STATE PHYSICS N 450 872 277 259 

SOLID SURFACES N 335 746 57 148 

SOLID SUSPENSIONS N 127 142 7 59 

SOLID WASTES N 576 437 74 546 

SOLID-SOLID INTERFACES N 289 3056 24 115 

SOLIDIFICATION N 1176 1506 50 986 

SOLIDIFIED GASES N 146 274 3 68 

SOLIDS N 1540 1622 787 1009 

SOLIDS FLOW N 95 189 11 54 

SOLIDUS N 21 120 0 14 

SO LIONS N 4 4 1 2 

SOLITARY WAVES N 289 1997 41 103 

SOLI THANES N 8 4 0 1 

SOLOMON COMPUTERS N 3 4 1 4 

SOLSTICES N 34 152 0 6 

SOLUBILITY N 985 808 76 675 

SOLUTES N 198 172 9 127 

SOLUTION N 26 10 8 28 

SOLUTIONS N 922 123 166 906 

SOLVATION N 49 10 5 26 

SOLVENT EXTRACTION N 340 79 30 261 

SOLVENT REFINED COAL N 124 8 2 108 

SOLVENT RETENTION N 4 1 0 4 

SOLVENTS N 934 228 135 770 

SOLVOLYSIS N 15 2 0 13 

SOMALIA N 15 7 2 7 

SOMMERFELD APPROXIMATION N 55 125 1 4 

SOMMERFELD WAVES N 17 77 1 2 

SONAR N 641 213 49 2094 

SONDES N 117 85 5 66 

SONIC ANEMOMETERS N 16 61 1 7 

SONIC BOOMS N 534 558 36 289 

SONIC NOZZLES N 37 100 0 17 

SONOBUOYS N 43 19 0 317 

SONOGRAMS N 17 97 4 18 

SONOLUMINESCENCE N 1 4 1 1 

SOOT N 287 421 6 143 

SORBATES N 4 0 0 1 

SORBENTS N 89 27 5 63 

SORET COEFFICIENT N 23 38 0 8 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SORGHUM N 32 16 1 13 

SORPTION N 236 147 12 159 

SORTIE SYSTEMS N 3 10 0 2 

SOS (SEMICONDUCTORS) N 77 274 3 76 

SOUND AMPLIFICATION N 52 109 5 44 

SOUND DETECTING AND RANGING N 13 76 1 13 

SOUND FIELDS N 366 940 7 145 

SOUND FIXING AND RANGING N 4 1 0 1 

SOUND GENERATORS N 299 501 9 171 

SOUND INTENSITY N 283 328 11 128 

SOUND LOCALIZATION N 82 66 8 39 

SOUND PRESSURE N 726 1382 15 352 

SOUND PROPAGATION N 598 829 59 310 

SOUND RANGING N 91 15 1 129 

SOUND TRANSDUCERS N 185 189 11 180 

SOUND TRANSMISSION N 944 521 73 941 

SOUND WAVES N 2041 3259 128 1240 

SOUND-SOUND INTERACTIONS N 21 21 1 4 

SOUNDING N 324 155 19 330 

SOUNDING ROCKETS N 1287 1186 46 974 

SOUNDS (TOPOGRAPHIC FEATURES) N 18 5 2 29 

SOURCE PROGRAMS N 72 24 2 28 

SOURCES N 45 40 11 32 

SOUTH AMERICA N 219 171 78 121 

SOUTH CAROL! NA N 119 39 17 75 

SOUTH DAKOTA N 195 45 22 103 

SOUTH KOREA N 41 16 8 45 

SOUTHEAST ASIA N 60 18 10 116 

SOUTHERN CALIFORNIA N 165 254 8 50 

SOUTHERN HEMISPHERE N 414 1397 15 112 

SOUTHERN OSCILLATION N 96 255 0 6 

SOUTHERN SKY N 16 435 6 5 

SOUTHERN YEMEN N 0 0 0 1 

SOVEREIGNTY N 9 211 13 11 

SOVIET SATELLITES N 6 41 1 34 

SOVIET SPACECRAFT N 80 398 28 204 

SOYBEANS N 185 146 5 49 

SOYUZ SPACECRAFT N 278 415 17 189 

SPACE N 39 21 54 768 

SPACE ADAPTATION SYNDROME N 84 127 1 53 

SPACE BASED RADAR N 77 239 1 102 

SPACE BASES N 76 138 5 87 

SPACE CAPSULES N 67 61 2 109 

SPACE CHARGE N 917 2141 21 396 

SPACE COLONIES N 55 379 45 167 

SPACE COMMERCIALIZATION B 4256 8102 266 10960 2

SPACE COMMUNICATION N 609 825 90 832 

SPACE COOLING (BUILDINGS) N 255 31 19 180 

SPACE DEBRIS N 191 464 13 135 

SPACE DENSITY N 47 681 1 18 
NASA COMBINED FILE POSTING STATISTICS 

9101 17 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SPACE DETECTION AND TRACKING SYSTEM N 23 26 1 45 

SPACE ELECTRIC ROCKET TESTS N 41 39 1 13 

SPACE ENVIRONMENT SIMULATION N 1261 1407 28 520 

SPACE ERECTABLE STRUCTURES N 362 366 6 177 

SPACE EXPLORATION N 1157 2164 722 1330 

SPACE FLIGHT N 885 672 476 1049 

SPACE FLIGHT FEEDING N 300 226 8 115 

SPACE FLIGHT STRESS N 717 1088 38 323 

SPACE FLIGHT TRACKING AND DATA NETWORK N 12 20 0 10 

SPACE FLIGHT TRAINING N 107 107 8 70 

SPACE GLOSSARIES N 30 4 4 14 

SPACE HABITATS N 41 146 3 72 

SPACE HEATING (BUILDINGS) N 1008 420 50 628 

SPACE INDUSTRIALIZATION N 103 534 57 446 

SPACE INFRARED TELESCOPE FACILITY N 68 144 0 69 

SPACE LABORATORIES N 302 279 43 335 

SPACE LAW N 116 1265 183 130 

SPACE LOGISTICS N 124 215 4 146 

SPACE MAINTENANCE N 345 506 8 234 

SPACE MANUFACTURING N 548 814 69 689 

SPACE MECHANICS N 37 48 12 27 

SPACE MISSIONS N 1405 1789 137 1788 

SPACE NAVIGATION N 431 817 72 768 

SPACE OBSERVATIONS (FROM EARTH) N 309 360 8 102 

SPACE OPERATIONS CENTER (NASA) N 8 12 20 7 

SPACE ORIENTATION N 22 122 0 14 

SPACE PERCEPTION N 324 880 36 138 

SPACE PLASMAS N 566 3837 46 349 

SPACE PLATFORMS N 405 876 11 319 

SPACE POWER REACTORS N 388 505 5 175 

SPACE POWER UNIT REACTORS N 125 55 4 118 

SPACE PROBES N 390 518 45 361 

SPACE PROCESSING N 748 1459 39 1066 

SPACE PROCESSING APPLICATIONS ROCKET N 41 16 0 30 

SPACE PROGRAMS N 665 826 232 700 

SPACE PSYCHOLOGY N 12 70 0 6 

SPACE RATIONS N 55 45 0 30 

SPACE RENDEZVOUS N 173 391 11 216 

SPACE SHUTTLE ASCENT STAGE N 118 19 0 166 

SPACE SHUTTLE BOOSTERS N 454 280 5 585 

SPACE SHUTTLE MAIN ENGINE N 532 394 2 431 

SPACE SHUTTLE MISSION 31-A N 14 22 0 7 

SPACE SHUTTLE MISSION 31-B N 8 24 0 18 

SPACE SHUTTLE MISSION 31-C N 30 36 0 6 

SPACE SHUTTLE MISSION 31-D N 13 23 1 8 

SPACE SHUTTLE MISSION 41-A N 7 19 0 2 

SPACE SHUTTLE MISSION 41-B N 11 21 0 2 

SPACE SHUTTLE MISSION 41-C N 7 5 0 4 

SPACE SHUTTLE MISSION 41-0 N 8 10 3 6 

SPACE SHUTTLE MISSION 41-G N 24 29 0 3 
NASA COMBINED FILE POSTING STATISTICS 

910117 

'******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SPACE SHUTTLE MISSION 51-A N 3 6 0 4 

SPACE SHUTTLE MISSION 51-B N 4 0 0 11 

SPACE SHUTTLE MISSION 51-C N 1 7 0 4 

SPACE SHUTTLE MISSION 51-D N 3 4 0 2 

SPACE SHUTTLE MISSION 51-E N 0 1 0 1 

SPACE SHUTTLE MISSION 51-F N 11 10 0 6 

SPACE SHUTTLE MISSION 51-G N 6 4 0 1 

SPACE SHUTTLE MISSION 51-H N 0 0 0 0 

SPACE SHUTTLE MISSION 51-I N 2 5 1 4 

SPACE SHUTTLE MISSION 51-J N 2 2 0 1 

SPACE SHUTTLE MISSION 51-L N 24 20 11 9 

SPACE SHUTTLE MISSION 61-A N 6 9 0 4 

SPACE SHUTTLE MISSION 61-B N 4 4 0 3 

SPACE SHUTTLE MISSION 61-C N 12 11 0 4 

SPACE SHUTTLE MISSION 61-E N 3 0 0 0 

SPACE SHUTTLE MISSIONS N 60 124 0 104 

SPACE SHUTTLE ORBITERS N 1801 1753 16 1557 

SPACE SHUTTLE PAYLOADS N 953 1475 15 734 

SPACE SHUTTLE UPPER STAGE A N 1 0 0 1 

SPACE SHUTTLE UPPER STAGE D N 2 0 0 0 

SPACE SHUTTLE UPPER STAGES N 9 70 1 20 

SPACE SHUTTLES N 4469 3178 273 5809 

SPACE SIMULATORS N 309 199 39 189 

SPACE STATION PAYLOADS N 123 232 0 41 

SPACE STATION POLAR PLATFORMS N 64 132 0 7 

SPACE STATION POWER SUPPLIES N 109 331 0 29 

SPACE STATION PROPULSION N 27 57 0 2 

SPACE STATION STRUCTURES N 93 133 0 53 

SPACE STATIONS N 3003 3714 281 3532 

SPACE STORAGE N 123 90 3 372 

SPACE SUITS N 280 255 5 250 

SPACE SURVEILLANCE N 19 48 1 117 

SPACE SURVEILLANCE (GROUND BASED) N 73 63 2 225 

SPACE SURVEILLANCE (SPACEBORNE) N 72 166 3 418 

SPACE TECHNOLOGY EXPERIMENTS N 21 24 0 401 

SPACE TEMPERATURE N 16 36 0 5 

SPACE TOOLS N 79 126 1 62 

SPACE TRANSPORTATION N 491 964 52 789 

SPACE TRANSPORTATION SYSTEM N 847 1068 57 996 

SPACE TRANSPORTATION SYSTEM FLIGHTS N 124 220 2 126 

SPACE TRANSPORTATION SYSTEM 1 FLIGHT N 73 47 1 27 

SPACE TRANSPORTATION SYSTEM 2 FLIGHT N 33 51 0 24 

SPACE TRANSPORTATION SYSTEM 3 FLIGHT N 51 70 1 14 

SPACE TRANSPORTATION SYSTEM 4 FLIGHT N 21 29 2 15 

SPACE TUGS N 236 215 5 366 

SPACE VEHICLE CHECKOUT PROGRAM N 1 1 1 180 5 279 

SPACE WEAPONS N 168 275 33 422 

SPACE-TIME FUNCTIONS N 671 3029 51 265 

SPACEBORNE ASTRONOMY N 869 3788 38 301 

SPACEBORNE EXPERIMENTS N 1565 2748 51 1046 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SPACEBORNE LASERS N 29 208 1 22 

SPACEBORNE PHOTOGRAPHY N 1049 1251 108 589 

SPACEBORNE TELESCOPES N 465 1387 34 284 

SPACECRAFT N 234 59 240 671 

SPACECRAFT ANTENNAS N 407 561 16 248 

SPACECRAFT BREAKUP N 7 38 0 10 

SPACECRAFT CABIN ATMOSPHERES N 338 322 23 216 

SPACECRAFT CABIN SIMULATORS N 93 31 1 46 

SPACECRAFT CABINS N 102 100 4 110 

SPACECRAFT CHARGING N 574 637 11 110 

SPACECRAFT COMMUNICATION N 1472 2350 122 1679 

SPACECRAFT COMPONENTS N 1046 448 18 1496 

SPACECRAFT CONFIGURATIONS N 986 1222 15 1359 

SPACECRAFT CONSTRUCTION MATERIALS N 662 1220 57 447 

SPACECRAFT CONTAMINATION N 546 635 15 273 

SPACECRAFT CONTROL N 1214 2642 169 1028 

SPACECRAFT DEFENSE N 26 14 5 128 

SPACECRAFT DESIGN N 2129 4053 233 2491 

SPACECRAFT DOCKING N 454 392 11 470 

SPACECRAFT DOCKING MODULES N 12 10 0 6 

SPACECRAFT ELECTRONIC EQUIPMENT N 529 698 33 421 

SPACECRAFT ENVIRONMENTS N 876 1002 72 736 

SPACECRAFT EQUIPMENT N 100 183 3 72 

SPACECRAFT GLOW N 51 54 0 13 

SPACECRAFT GUIDANCE N 532 858 96 1206 

SPACECRAFT INSTRUMENTS N 683 1588 84 835 

SPACECRAFT LANDING N 190 272 7 219 

SPACECRAFT LAUNCHING N 913 1381 40 1302 

SPACECRAFT LUBRICATION N 98 65 3 15 

SPACECRAFT MAINTENANCE N 69 163 1 48 

SPACECRAFT MANEUVERS N 316 1047 11 278 

SPACECRAFT MODELS N 387 356 4 367 

SPACECRAFT MODULES N 284 734 0 283 

SPACECRAFT MOTION N 251 838 14 106 

SPACECRAFT ORBITS N 338 463 23 337 

SPACECRAFT PERFORMANCE N 484 653 18 744 

SPACECRAFT POSITION INDICATORS N 34 67 0 24 

SPACECRAFT POWER SUPPLIES N 2408 3074 86 1330 

SPACECRAFT PROPULSION N 905 2368 128 1394 

SPACECRAFT RADIATORS N 251 536 4 163 

SPACECRAFT RECOVERY N 124 240 17 241 

SPACECRAFT REENTRY N 210 547 20 281 

SPACECRAFT RELIABILITY N 249 949 18 288 

SPACECRAFT SHIELDING N 317 500 12 352 

SPACECRAFT STABILITY N 468 1517 21 468 

SPACECRAFT STERILIZATION N 215 158 10 155 

SPACECRAFT STRUCTURES N 1029 1133 64 818 

SPACECRAFT SURVIVABILITY N 31 54 0 34 

SPACECRAFT TELEVISION N 73 205 4 48 

SPACECRAFT TEMPERATURE N 110 191 0 25 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *"'**** .. TYPE STAR IAA NLN OTHER 

SPACECRAFT TRACKING N 584 385 25 529 

SPACECRAFT TRAJECTORIES N 426 1148 35 612 

SPACECREW TRANSFER N 3 3 1 5 

SPACECREWS N 595 568 19 657 

SPACE LAB N 1080 1265 55 819 

SPACELAB PAYLOADS N 735 854 12 195 

SPACERS N 49 28 0 63 

SPACETENNAS N 43 73 0 10 

SPACING N 165 213 3 59 

SPAIN N 173 168 50 78 

SPALLATION N 182 333 2 109 

SPALLING N 169 179 1 69 

SPAN N 2 23 0 3 

SPANISH SAHARA N 1 1 0 2 

SPANISH SPACE PROGRAM N 0 1 0 0 

SPANLOADER AIRCRAFT N 8 6 0 3 

SPANWISE BLOWING N 43 76 0 33 

SPARE PARTS N 213 169 7 395 

SPARK CHAMBERS N 379 264 7 123 

SPARK GAPS N 239 255 4 232 

SPARK IGNITION N 268 225 14 146 

SPARK MACHINING N 45 131 5 57 

SPARK PLUGS N 12 31 1 39 

SPARKS N 53 77 5 64 

--- SPARROW MISSILES N 8 9 0 197 

SPARROW 2 MISSILE N 0 0 0 2 

SPARROW 3 MISSILE N 2 0 0 57 

SPARTAN MISSILE N 4 6 0 99 

SPARTAN SATELLITES N 5 12 0 5 

SPASMS N 1 16 1 3 

SPATIAL DEPENDENCIES N 81 460 1 31 

SPATIAL DISTRIBUTION N 2233 8110 24 1144 

SPATIAL FILTERING N 481 1717 12 263 

SPATIAL MARCHING N 40 146 0 4 

SPATIAL RESOLUTION N 1097 1337 1 321 

SPECIES DIFFUSION N 32 334 16 21 

SPECIFIC HEAT N 1174 1820 51 591 

SPECIFIC IMPULSE N 341 663 0 746 

SPECIFICATIONS N 2578 261 250 4626 

SPECIMEN GEOMETRY N 159 2517 6 38 

SPECIMENS N 107 110 30 90 

SPECKLE HOLOGRAPHY N 3 28 0 2 

SPECKLE INTERFEROMETRY N 33 223 0 10 

SPECKLE PATTERNS N 250 1257 19 76 

SPECTRA N 853 67 101 814 

SPECTRAL BANDS N 725 2618 7 377 

SPECTRAL CORRELATION N 114 751 3 47 

SPECTRAL EMISSION N 522 825 15 257 

SPECTRAL ENERGY DISTRIBUTION N 716 4871 12 272 

SPECTRAL LINE WIDTH N 322 6879 11 108 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *****"'-* TYPE STAR IAA NLN OTHER 

SPECTRAL METHODS N 277 995 3 58 

SPECTRAL RECONNAISSANCE N 227 61 3 110 

SPECTRAL REFLECTANCE N 841 2667 15 348 

SPECTRAL RESOLUTION N 737 2505 7 294 

SPECTRAL SENSITIVITY N 224 1136 3 78 

SPECTRAL SHIFT CONTROL N 6 10 0 2 

SPECTRAL SHIFT CONTROL REACTOR N 3 0 0 1 

SPECTRAL SIGNATURES N 994 725 23 820 

SPECTRAL THEORY N 118 228 93 111 

SPECTROGRAMS N 138 558 1 90 

SPECTROGRAPHS N 203 540 9 153 

SPECTROHELIOGRAPHS N 177 977 7 179 

SPECTROMETERS N 2476 1941 150 1960 

SPECTROPHOTOGRAPHY N 43 67 5 28 

SPECTRDPHOTOMETERS N 352 373 18 257 

SPECTROPHOTOMETRY N 677 1468 58 360 

SPECTROPHOTOVOLTAICS N 1 28 0 1 

SPECTRORADIOMETERS N 229 339 11 119 

SPECTROSCOPIC ANALYSIS N 1476 1435 221 726 

SPECTROSCOPIC TELESCOPES N 102 202 3 54 

SPECTROSCOPY N 1917 656 656 1526 

SPECTRUM ANALYSIS N 6158 13424 701 3252 2

SPECULAR REFLECTION N 259 1084 5 154 

SPEECH N 433 152 185 305 

SPEECH BASEBAND COMPRESSION N 26 32 0 9 

SPEECH DEFECTS N 7 10 14 7 

SPEECH RECOGNITION N 1046 367 66 425 

SPEED CONTROL N 186 472 8 125 

SPEED INDICATORS N 111 121 6 114 

SPEED REGULATORS N 65 40 8 81 

SPENT FUELS N 139 1 2 81 

SPERMATOGENESIS N 20 17 1 8 

SPERMATOZOA N 17 6 4 10 

SPERT REACTORS N 7 0 0 4 

SPHERES N 1261 3042 33 689 

SPHERICAL ANTENNAS N 31 145 3 9 

SPHERICAL CAPS N 50 173 0 16 

SPHERICAL COORDINATES N 192 522 2 64 

SPHERICAL HARMONICS N 423 1325 24 148 

SPHERICAL PLASMAS N 18 52 1 8 

SPHERICAL SHELLS N 485 1902 9 200 

SPHERICAL TANKS N 56 84 1 38 

SPHERICAL WAVES N 174 941 12 55 

SPHEROIDS N 97 429 12 80 

SPHEROMAKS N 84 20 0 8 

SPHERULES N 37 184 0 18 

SPHERULITES N 29 36 0 15 

SPHINX N 4 9 0 4 

SPHYGMOGRAPHY N 11 30 0 3 

SPICULES N 25 165 2 9 
910117 

NASA 

******* SUBJECT TERM ******* 

SPIKE 

SPIDERS 

NOZZLES 

SPIKE POTENTIALS 

SPIKES 

COMBINED 

SPIKES (AERODYNAMIC CONFIGURATIONS) 

SPI 

SPIKING 

LUNG 

SPIN 

SPIN 

DECOUPLING 

SPIN DYNAMICS 

SPIN EXCHANGE 

SPIN GLASS 

SPIN REDUCTION 

SPIN RESONANCE 

SPIN STABILIZATION 

SPIN TEMPERATURE 

SPIN TESTS 

SPIN-LATTICE RELAXATION 

SPIN-ORBIT INTERACTIONS 

SPIN-SPIN COUPLING 

SPINAL 

SPINACH 

CORD 

SPINNING 

SPINNERS 

SPINEL 

SPINE 

SPINDLES 

SOLID UPPER STAGE 

SPINNING UNGUIDED ROCKET TRAJECTORY 

SPINOR GROUPS 

SPIRAL ANTENNAS 

SPIRAL GALAXIES 

SPIRAL WRAPPING 

SPIRALS 

SPIRALS 

(CONCENTRATORS) 

SPITSBERGEN 

SPIROMETERS 

(NORWAY) 

SPLINE 

SPLICING 

SPLEEN 

SPLASHING 

FUNCTIONS 

SPLIT 

SPLINTS 

SPLINES 

FLAPS 

SPOILER 

SPODUMENE 

SPLITTING 

SLOT AILERONS 

SPONGES 

SPOKES 

SPOILERS 

(MATERIALS) 

SPONTANEOUS COMBUSTION 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

STAR 

4 

3 

23 

15 

28 

7 

289 

163 

28 

625 

33 

70 

592 

292 

127 

16 

237 

269 

356 

174 

9 

29 

97 

158 

154 

5 

1 

5 

48 

83 

207 

24 

16 

26 

30 

4 

64 

70 

16 

777 

91 

9 

1 

166 

6 

3 

174 

17 

13 

102 

STATISTICS 

IAA 

7 

3 

35 

47 

38 

69 

98 

153 

19 

1001 

36 

35 

177 

213 

1017 

33 

111 

304 

175 

174 

10 

234 

25 

374 

173 

5 

11 

12 

139 

151 

3706 

16 

146 

67 

15 

5 

13 

123 

41 

984 

43 

4 

17 

159 

3 

3 

161 

19 

33 

137 

NLN 

0 

0 

1 

2 

0 

8 

22 

13 

1 

25 

0 

3 

2 

20 

0 

3 

7 

19 

0 

7 

9 

13 

20 

0 

0 

0 

7 

12 

2 

12 

6 

3 

1 

0 

0 

0 

0 

3 

37 

8 

0 

0 

0 

1 

6 

2 

0 

0 

4 

OTHER 

1 

13 

38 

9 

39 

9 

73 

215 

8 

333 

20 

9 

85 

48 

409 

0 

150 

46 

84 

97 

2 

60 

31 

60 

126 

6 

4 

3 

19 

22 

59 

64 

31 

2 

10 

0 

51 

47 

11 

242 

74 

1 

80 

12 

6 

2 

168 

2 

66 

10 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SPONTANEOUS EMISSION N 44 959 3 10 

SPOOLS N 16 30 0 29 

SPORADIC E LAYER N 95 919 6 59 

SPORADIC METEOROIDS N 16 109 0 8 

SPORES N 118 95 15 73 

SPORTS MEDICINE N 1 9 7 0 

SPOT (FRENCH SATELLITE) N 427 695 2 56 

SPOT WELDS N 57 171 4 106 

SPRAY CHARACTERISTICS N 120 369 2 57 

SPRAY CONDENSERS N 5 2 1 1 

SPRAY INGESTION N 2 4 0 2 

SPRAY NOZZLES N 114 98 1 87 

SPRAYED COATINGS N 210 604 16 201 

SPRAYERS N 247 94 8 210 

SPRAYING N 162 133 22 144 

SPREAD F N 80 412 3 17 

SPREAD REFLECTION N 5 21 1 4 

SPREAD SPECTRUM TRANSMISSION N 287 806 25 250 

SPREADING N 85 73 1 33 

SPRING (SEASON) N 46 194 0 3 

SPRINGS (ELASTIC) N 306 664 24 289 

SPRINGS (WATER) N 52 59 5 60 

SPRINKLING N 19 2 8 18 

SPRINT MISSILE N 4 6 0 184 

SPUTNIK SATELLITES N 7 35 10 29 

SPUTNIK 1 SATELLITE N 0 8 1 5 

SPUTNIK 2 SATELLITE N 0 0 0 1 

SPUTNIK 3 SATELLITE N 2 8 0 0 

SPUTNIK 4 SATELLITE N 2 1 0 1 

SPUTNIK 5 SATELLITE N 0 0 0 1 

SPUTTERING N 1242 1340 41 694 

SPUTTERING GAGES N 11 7 1 3 

SQUALLS N 72 196 1 14 

SQUAMA N 1 0 0 0 

SQUARE WAVES N 131 308 3 87 

SQUARE WELLS N 3 1 0 1 

SQUARES (MATHEMATICS) N 56 54 10 15 

SQUEEZE FILMS N 55 215 0 4 

SQUEEZED STATES (QUANTUM THEORY) N 15 292 0 0 

SQUELCH CIRCUITS N 10 6 1 5 

SQUIBS N 18 16 0 65 

SQUID (DETECTORS) N 77 343 4 38 

SQUID PROJECT N 62 3 3 17 

SQUIRRELS N 2 18 2 3 

SR-71 AIRCRAFT N 0 2 0 0 

SRET SATELLITES N 0 1 0 0 

SRET 1 SATELLITE N 1 0 0 0 

SRET 2 SATELLITE N 2 3 0 0 

SRI LANKA N 19 28 7 2 

SS-11 MISSILE N 0 0 0 3 
910117 

NASA COMBINED 

******* SUBJECT TERM ******* 

ST LAWRENCE VALLEV (NORTH AMERICA) 

ST LOUIS-KANSAS CITV CORRIDOR (MD) 

STABILITV 

STABILITY 

AUGMENTATION 

STABILITY DERIVATIVES 

STABILITY TESTS 

STABILIZED 

STABILIZATION 

PLATFORMS 

STABILIZERS 

STABILIZERS 

(AGENTS) 

STABILIZERS (FLUID DYNAMICS) 

STABLE OSCILLATIONS 

STACKING FAULT ENERGY 

STAGE 

STADIMETERS 

STACKS 

SEPARATION 

STAGNATION 

STAGGERING 

FLOW 

STAGNATION POINT 

STAGNATION PRESSURE 

STAGNATION TEMPERATURE 

STAINLESS 

STAINING 

STEELS 

STANDARD 

STAMPING 

STALLING 

STAIRWAYS 

STAIRSTEPS 

DEVIATION 

STANDARD LAUNCH VEHICLE 5 

STANDARD LAUNCH VEHICLES 

STANDARDIZED 

STANDARDIZATION 

SPACE GUIDANCE 

STANDING 

STANDARDS 

WAVE RATIOS 

STANDING WAVES 

STANTON 

STANNIDES 

STANNATES 

NUMBER 

STAR 

STAPHYLOCOCCUS 

CLUSTERS 

STAR DISTRIBUTION 

STAR FORMATION 

STAR FORMATION RATE 

STAR TRACKERS 

STARBURST GALAXIES 

STARK 

STARCHES 

EFFECT 

STARPROBE 

STARLAB 

MISSION 

STARPROBE SPACECRAFT 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

STAR 

9 

7 

2939 

316 

680 

296 

641 

110 

8 

98 

181 

78 

97 

241 

177 

17 

146 

209 

481 

151 

28 

2668 

6 

58 

53 

12 

525 

0 

1080 

1 

4027 

65 

311 

21 

9 

44 

85 

252 

269 

291 

37 

406 

20 

45 

280 

0 

4 

STATISTICS 

IAA 

7 

55 

404 

521 

355 

647 

150 

705 

81 

63 

185 

292 

608 

142 

2 

241 

62 

477 

1336 

321 

361 

28 

2224 

10 

6 

99 

34 

1071 

3 

0 

562 

4 

1480 

401 

1290 

11 

13 

291 

22 

2184 

2907 

2549 

344 

555 

377 

17 

1078 

11 

6 

8 

NLN 

0 

0 

302 

1 

13 

7 

28 

2 

0 

3 

0 

1 

3 

0 

5 

1 

2 

2 

8 

2 

6 

12 

100 

2 

4 

0 

13 

0 

0 

5 

83 

0 

1276 

0 

1 

0 

9 

35 

77 

0 

0 

11 

7 

0 

20 

0 

0 

0 

OTHER 

2 

5 

2044 

55 

355 

673 

286 

433 

8 

78 

268 

25 

66 

118 

4 

520 

69 

13 

105 

151 

255 

21 

2029 

6 

4 

92 

46 

209 

3 

39 

810 

2 

2260 

108 

101 

5 

8 

17 

19 

133 

180 

47 

4 

291 

27 

10 

120 

3 

1 

2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

STARQUAKES N 4 39 0 0 

STARS N 733 297 504 849 

STARS (MATHEMATICS) N 11 2 0 3 

STARSAT TELESCOPE N 0 0 0 1 

STARS IT E PROGRAM N 0 0 1 1 

STARSPOTS N 16 243 0 2 

STARTERS N 10 13 1 29 

STARTING N 150 119 2 266 

STATE ESTIMATION N 247 801 0 26 

STATE VECTORS N 300 2664 17 117 

STATIC AERODYNAMIC CHARACTERISTICS N 101 97 4 66 

STATIC ALTERNATORS N 5 0 0 5 

STATIC CHARACTERISTICS N 38 195 1 7 

STATIC DEFORMATION N 78 209 3 15 

STATIC DISCHARGERS N 40 27 0 39 

STATIC ELECTRICITY N 195 163 36 165 

STATIC FIRING N 78 89 0 411 

STATIC FRICTION N 26 65 1 17 

STATIC INVERTERS N 34 93 4 55 

STATIC LOADS N 675 2033 18 425 

STATIC MODELS N 34 42 0 33 

STATIC PRESSURE N 716 1420 5 533 

STATIC STABILITY N 426 824 16 591 

STATIC TESTS N 763 1157 15 1127 

STATIC THRUST N 34 19 1 23 

STATICS N 146 178 134 191 

STATIONARY ORBITS N 146 414 0 49 

STATIONKEEPING N 272 570 2 159 

STATIONS N 117 16 19 347 

STATISTICAL ANALYSIS N 10030 13321 1685 5634 3

STATISTICAL CORRELATION N 594 1638 61 173 

STATISTICAL DECISION THEORY N 229 371 59 82 

STATISTICAL DISTRIBUTIONS N 2027 2532 178 740 

STATISTICAL MECHANICS N 643 1039 393 195 

STATISTICAL TESTS N 890 783 44 286 

STATISTICAL WEATHER FORECASTING N 430 680 18 131 

STATISTICS N 207 147 553 176 

STATOR BLADES N 217 249 0 87 

STATORS N 389 431 3 249 

STDN (NETWORK) N 83 66 1 103 

STEADY FLOW N 796 5105 13 246 

STEADY STATE N 1624 5266 44 698 

STEADY STATE CREEP N 44 627 2 14 

STEAM N 600 279 82 447 

STEAM FLOW N 193 125 8 81 

STEAM TURBINES N 353 435 45 197 

STEARATES N 24 27 1 19 

STEAROTHERMOPHILUS N 0 4 0 2 

STEEL STRUCTURES N 436 738 100 275 

STEELS N 3979 3534 526 2737 1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

STEEPEST DESCENT METHOD N 146 406 8 48 

STEERABLE ANTENNAS N 170 661 4 185 

STEERING N 232 191 6 328 

STEFAN-BOLTZMANN LAW N 39 171 0 14 

STELLAR ACTIVITY N 104 462 2 26 

STELLAR ATMOSPHERES N 537 4424 64 269 

STELLAR COLOR N 115 1385 1 15 

STELLAR COMPOSITION N 102 1123 1 16 

STELLAR CORES N 42 545 0 6 

STELLAR CORONAS N 134 645 2 41 

STELLAR ENVELOPES N 292 4442 5 73 

STELLAR EVOLUTION N 1040 10433 173 396 1

STELLAR FLARES N 79 510 0 25 

STELLAR GRAVITATION N 79 817 2 11 

STELLAR INTERIORS N 35 447 0 15 

STELLAR LUMINOSITY N 805 7425 64 372 

STELLAR MAGNETIC FIELDS N 243 2700 9 46 

STELLAR MAGNETOSPHERE$ N 18 99 0 1 

STELLAR MAGNITUDE N 173 2369 6 22 

STELLAR MASS N 477 4491 23 154 

STELLAR MASS ACCRETION N 262 2326 2 32 

STELLAR MASS EJECTION N 350 3659 6 75 

STELLAR MODELS N 550 6559 6 51 

STELLAR MOTIONS N 242 3435 94 194 

STELLAR OCCULTATION N 98 545 4 51 

STELLAR ORBITS N 50 694 1 4 

STELLAR OSCILLATIONS N 84 1350 4 15 

STELLAR PARALLAX N 58 260 0 1 

STELLAR PHYSICS N 68 572 2 30 

STELLAR RADIATION N 462 2892 33 186 

STELLAR ROTATION N 270 3674 12 68 

STELLAR SPECTRA N 1322 9600 123 526 

STELLAR SPECTROPHOTOMETRY N 535 8131 47 217 

STELLAR STRUCTURE N 332 2738 59 141 

STELLAR SYSTEMS N 65 740 0 11 

STELLAR TEMPERATURE N 261 2836 5 26 

STELLAR WINDS N 414 2581 6 84 

STELLARATORS N 389 372 3 77 

STELLITE (TRADEMARK) N 19 21 0 10 

STEMS N 27 15 0 25 

STENCIL PROCESSES N 5 4 1 3 

STEP FUNCTIONS N 253 726 6 81 

STEP RECOVERY DIODES N 5 2 0 1 

STEPPES N 11 21 0 12 

STEPPING MOTORS N 67 30 4 17 

STEPPING SWITCHES N 3 1 0 1 

STEPS N 15 40 0 16 

STEREOCHEMISTRY N 170 158 91 110 

STEREOPHONICS N 7 3 0 1 

STEREOPHOTOGRAPHY N 473 840 36 253 
910117 

NASA 

******* SUBJECT TERM ******* 

STEREOSCOPIC VISION 

STERILIZATION 

STERILIZATION 

STEREOTELEVISION 

STEREOSCOPY 

EFFECTS 

STIELTJES 

STETHOSCOPES 

STEROIDS 

STERNUM 

INTEGRAL 

STIFFNESS 

STIFFNESS 

STIFFENING 

MATRIX 

STIMULATED 

STIMULANTS 

STILLS 

STILBENE 

STIGMATISM 

EMISSION 

STIMULATED EMISSION DEVICES 

ST 

STIMULATION 

!MULl 

STIRLING CYCLE 

STIRLING ENGINES 

STOCHASTIC 

STISHOVITE 

STIRRING 

PROCESSES 

STOKES 

STOICHIOMETRY 

STOCKPILING 

FLOW 

STOKES LAW 

STOKES LAW (FLUID MECHANICS) 

STOKES LAW OF RADIATION 

STOKES THEOREM (VECTOR CALCULUS) 

STOKES-BELTRAMI EQUATION 

STONY 

STOMACH 

METEORITES 

STONY-IRON METEORITES 

STOPPING 

STOPPING 

POWER 

STORABLE PROPELLANTS 

STORAGE 

STORAGE 

BATTERIES 

COMBINED 

STORAGE RINGS (PARTICLE ACCELERATORS) 

STORAGE STABILITY 

STORAGE TANKS 

STORM DAMAGE 

STORM ENHANCEMENT 

STORM SUPPRESSION 

STORM SURGES 

STORMS 

STORMS 

(METEOROLOGY) 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

183 

142 

STAR 

19 

235 

21 

2 

52 

5 

21 

255 

1545 

485 

9 

29 

7 

22 

189 

85 

191 

57 

453 

553 

45 

3 

4183 

77 

810 

74 

8 

54 

78 

84 

1 

39 

28 

7 

81 

120 

566 

584 

595 

675 

189 

122 

128 

7 

89 

16 

803 

359 

STATISTICS 

IAA 

278 

241 

16 

50 

22 

6 

69 

9 

49 

536 

2468 

2287 

28 

18 

1 1 

31 

1861 

71 

86 

65 

406 

522 

20 

37 

6827 

13 

106 

454 

150 

133 

363 

939 

43 

10 

411 

62 

61 

67 

25 

47 

422 

228 

118 

819 

47 

9 

4 

65 

22 

791 

NLN 

6 

11 

2 

32 

0 

0 

73 

7 

0 

12 

25 

4 

5 

0 

0 

22 

3 

10 

4 

21 

0 

0 

1 

550 

9 

33 

4 

0 

3 

3 

0 

4 

2 

0 

3 

10 

1 

42 

29 

8 

9 

10 

21 

0 

0 

0 

37 

26 

OTHER 

11 

79 

26 

195 

0 

7 

55 

3 

0 

118 

645 

162 

9 

2 

8 

6 

155 

98 

351 

34 

109 

275 

35 

2 

1671 

76 

357 

15 

1 

14 

41 

36 

1 

31 

53 

28 

34 

531 

595 

193 

683 

262 

566 

45 

4 

1 

18 

406 

229 

1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

STORMSAT SATELLITE N 11 6 0 1 

STOWAGE (ONBOARD EQUIPMENT) N 42 15 0 28 

STRAIN DISTRIBUTION N 319 882 0 27 

STRAIN ENERGY METHODS N 276 2118 10 114 

STRAIN ENERGY RELEASE RATE N 148 489 0 18 

STRAIN GAGE ACCELEROMETERS N 24 16 0 15 

STRAIN GAGE BALANCES N 60 50 0 21 

STRAIN GAGES N 1054 1654 90 913 

STRAIN HARDENING N 541 1672 7 162 

STRAIN MEASUREMENT N 230 466 2 79 

STRAIN RATE N 1512 4050 47 623 

STRAITS N 48 37 2 52 

STRAKES N 61 80 1 53 

STRANDS N 40 36 0 47 

STRANGE ATTRACTORS N 27 451 0 5 

STRANGENESS N 94 11 7 20 

STRAPDOWN INERTIAL GUIDANCE N 292 569 9 272 

STRAPS N 41 22 0 63 

STRATA N 134 442 6 82 

STRATEGIC MATERIALS N 35 8 7 38 

STRATEGY N 685 512 189 698 

STRATIFICATION N 469 356 7 311 

STRATIFIED FLOW N 292 1154 6 156 

STRATIGRAPHY N 713 372 347 634 

STRATOCUMULUS CLOUDS N 121 193 0 21 

STRATOPAUSE N 18 54 0 6 

STRATOSCOPE TELESCOPES N 11 21 1 20 

STRATOSPHERE N 2010 5547 122 1330 

STRATOSPHERE RADIATION N 49 205 1 26 

STRATOSPHERIC WARMING N 119 376 0 8 

STRATUS CLOUDS N 148 295 0 57 

STREAK CAMERAS N 174 166 0 37 

STREAK PHOTOGRAPHY N 115 229 2 23 

STREAM FUNCTIONS (FLUIDS) N 269 2068 5 75 

STREAMLINED BODIES N 62 121 2 41 

STREAMLINING N 140 256 3 93 

STREAMS N 461 83 43 551 

STREETS N 28 15 15 28 

STRENGTH N 36 93 8 60 

STREPTOCOCCUS N 15 13 1 4 

STREPTOMYCETES N 11 5 0 3 

STREPTOMYCIN N 5 3 0 4 

STRESS (BIOLOGY) N 53 54 2 48 

STRESS (PHYSIOLOGY) N 1481 1507 154 853 

STRESS (PSYCHOLOGY) N 581 772 120 306 

STRESS ANALYSIS N 5615 12040 533 3449 2

STRESS CONCENTRATION N 542 2169 122 212 

STRESS CORROSION N 941 655 51 718 

STRESS CORROSION CRACKING N 714 1545 34 306 

STRESS CYCLES N 339 1546 8 194 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*****-** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

STRESS DISTRIBUTION N 3061 14966 0 1114 1

STRESS FUNCTIONS N 193 1405 14 59 

STRESS INTENSITY FACTORS N 812 4265 8 188 

STRESS MEASUREMENT N 582 1925 41 357 

STRESS PROPAGATION N 90 465 2 46 

STRESS RATIO N 118 286 1 63 

STRESS RELAXATION N 471 1247 21 218 

STRESS RELIEVING N 128 210 2 101 

STRESS TENSORS N 221 2087 14 88 

STRESS WAVES N 392 1103 21 188 

STRESS-STRAIN DIAGRAMS N 1033 4919 64 506 

STRESS-STRAIN RELATIONSHIPS N 1498 4347 94 789 

STRESS-STRAIN-TIME RELATIONS N 164 806 3 85 

STRESSED-SKIN STRUCTURES N 20 42 2 21 

STRESSES N 2134 112 257 1728 

STRETCH FORMING N 24 58 0 43 

STRETCHERS N 5 2 0 19 

STRETCHING N 155 317 5 59 

STRIATION N 138 262 2 102 

STRING THEORY N 198 328 0 6 

STRINGERS N 110 340 1 59 

STRINGS N 69 160 10 22 

STRIP N 15 285 0 8 

STRIP MINING N 180 56 23 130 

STRIP TRANSMISSION LINES N 253 827 7 217 

STRIPPING N 28 14 1 13 

STRIPPING (DISTILLATION) N 20 3 0 13 

STROBOSCOPES N 76 232 5 50 

STROKES N 5 23 3 1 

STROKING TESTS N 4 1 0 0 

STRONG INTERACTIONS (FIELD THEORY) N 52 46 4 21 

STRONGLY COUPLED PLASMAS N 99 30 1 45 

STRONTIUM N 171 225 8 110 

STRONTIUM BROMIDES N 2 1 0 0 

STRONTIUM COMPOUNDS N 166 699 1 52 

STRONTIUM FLUORIDES N 38 29 0 26 

STRONTIUM ISOTOPES N 61 225 3 25 

STRONTIUM SULFIDES N 5 7 0 0 

STRONTIUM TITANATES N 60 112 0 28 

STRONTIUM ZIRCONATES N 3 7 0 3 

STRONTIUM 85 N 7 3 0 5 

STRONTIUM 87 N 1 14 0 1 

STRONTIUM 88 N 2 3 0 1 

STRONTIUM 89 N 12 1 0 7 

STRONTIUM 90 N 120 46 1 77 

STROUHAL NUMBER N 129 699 1 46 

STRUCTURAL ANALYSIS N 5905 8967 680 4965 2

STRUCTURAL BASINS N 416 418 30 249 

STRUCTURAL DESIGN N 4495 6217 870 2952 1

STRUCTURAL DESIGN CRITERIA N 2007 1572 99 1403 
NASA COMBINED FILE POSTING STATISTICS 

910117 

****** ..... SUBJECT TERM ._ -**  TYPE STAR IAA NLN OTHER 

STRUCTURAL ENGINEERING N 1195 735 663 1012 

STRUCTURAL FAILURE N 724 2254 57 582 

STRUCTURAL INFLUENCE COEFFICIENTS N 30 158 8 21 

STRUCTURAL MEMBERS N 1103 884 203 1084 

STRUCTURAL PROPERTIES (GEOLOGY) N 1438 956 116 725 

STRUCTURAL RELIABILITY N 380 1172 54 546 

STRUCTURAL STABILITY N 1450 4828 239 940 

STRUCTURAL STRAIN N 609 1402 98 345 

STRUCTURAL VIBRATION N 1542 8879 123 721 1

STRUCTURAL WEIGHT N 373 2312 13 467 

STRUCTURED PROGRAMMING N 0 1 0 0 

STRUCTURES N 110 28 65 123 

STRUTS N 226 237 7 238 

STRYCHNINE N 5 9 0 1 

STUDENTS N 343 132 125 355 

STUDS (STRUCTURAL MEMBERS) N 31 15 2 38 

STURM-LIOUVILLE THEORY N 46 240 15 14 

STYPHNATES N 5 5 0 5 

STYRENES N 222 60 9 135 

STYROFOAM (TRADEMARK) N 17 11 0 13 

SUBARCTIC REGIONS N 24 24 1 16 

SUBASSEMBLIES N 67 74 2 57 

SUBAUOIBLE FREQUENCIES N 7 4 0 2 

SUBCONTRACTS N 14 28 12 28 

SUBCRITICAL FLOW N 87 176 0 33 

SUBCRITICAL MASS N 7 0 0 4 

SUBDIVISIONS N 22 13 5 3 

SUBDUCTION (GEOLOGY) N 96 120 0 16 

SUBDWARF STARS N 35 315 0 7 

SUBGIANT STARS N 8 143 0 2 

SUBGROUPS N 154 20 14 98 

SUBHARMONIC GENERATORS N 29 147 0 5 

SUBJECTS N 49 4 57 43 

SUBLETHAL DOSAGE N 7 6 0 48 

SUBLIMATION N 184 389 6 138 

SUBLIMINAL STIMULI N 4 7 2 3 

SUBMARINE CABLES N 33 22 3 36 

SUBMARINE INTEGRATED CONTROL PROJECT N 1 0 0 0 

SUBMARINE PROPULSION N 5 7 0 12 

SUBMARINES N 341 96 50 1344 

SUBMERGED BODIES N 223 266 9 155 

SUBMERGING N 215 339 4 169 

SUBMERSIBLE AIRCRAFT N 1 3 0 6 

SUBMILLIMETER WAVES N 331 1624 28 300 

SUBMINIATURIZATION N 18 15 1 105 

SUBORBITAL FLIGHT N 8 19 0 21 

SUBREFLECTORS N 53 137 0 17 

SUBROC MISSILE N 0 0 0 9 

SUBROUTINE LIBRARIES (COMPUTERS) N 226 57 9 77 

SUBROUTINES N 1757 430 66 1163 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SUBSIDENCE N 80 23 10 42 

SUBSIDIARIES N 1 2 10 4 

SUBSONIC AIRCRAFT N 125 409 9 93 

SUBSONIC FLOW N 1383 3424 34 747 

SUBSONIC FLUTTER N 56 76 0 33 

SUBSONIC SPEED N 903 482 10 877 

SUBSONIC WIND TUNNELS N 261 424 2 174 

SUBSTITUTES N 194 54 24 148 

SUBSTRATES N 2504 2917 23 1811 

SUBSTRUCTURES N 176 327 8 94 

SUBTRACTION N 20 48 2 9 

SUBURBAN AREAS N 44 42 7 16 

SUBZERO TEMPERATURE N 17 10 2 16 

SUCCESS PROJECT N 1 1 4 1 

SUCCINIMIDES N 3 13 0 5 

SUCROSE N 22 28 2 13 

SUCTION N 377 1218 5 435 

SUD AVIATION AIRCRAFT N 1 3 0 6 

SUDAN N 32 61 5 27 

SUDDEN ENHANCEMENT OF ATMOSPHERICS N 5 59 1 15 

SUDDEN IONOSPHERIC DISTURBANCES N 233 358 1 44 

SUDDEN STORM COMMENCEMENTS N 42 339 0 6 

SUGAR BEETS N 38 20 2 18 

SUGAR CANE N 70 34 2 25 

SUGARS N 72 66 14 71 

SUGGESTION N 7 7 6 2 

SUHL EFFECT N 2 6 0 1 

SUITABILITY N 20 4 1 25 

SUITS N 20 19 1 26 

SULFATES N 656 861 19 314 

SULFATION N 46 91 2 18 

SULFIDATION N 21 28 0 8 

SULFIDES N 500 720 30 296 

SULFITES N 37 34 0 26 

SULFDNATES N 91 28 7 55 

SULFONES N 138 104 2 82 

SULFONIC ACID N 40 14 1 11 

SULFUR N 930 1122 59 557 

SULFUR CHLORIDES N 29 24 0 13 

SULFUR COMPOUNDS N 515 418 54 319 

SULFUR DIOXIDES N 640 1492 34 323 

SULFUR FLUORIDES N 207 382 0 70 

SULFUR ISOTOPES N 23 85 0 3 

SULFUR OXIDES N 757 383 30 357 

SULFURIC ACID N 463 674 10 247 

SUM RULES N 202 47 5 82 

SUMMARIES N 400 9 42 303 

SUMMER N 433 1174 5 181 

SUMPS N 9 3 0 19 

SUMS N 163 174 18 54 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ~****** TYPE STAR IAA NLN OTHER 

SUN N 804 595 235 554 

SUNBLAZER SPACE PROBE N 3 1 0 5 

SUNFLOWER POWER SYSTEM N 0 0 1 0 

SUNFLOWERS N 19 9 0 7 

SUNGLASSES N 12 3 0 7 

SUNLIGHT N 456 499 29 212 

SUNRISE N 61 221 5 36 

SUNSET N 64 160 5 28 

SUNSPOT CYCLE N 149 759 8 81 

SUNSPOTS N 623 3167 21 455 

SUPERCAVITATING FLOW N 39 71 3 38 

SUPERCHARGERS N 98 92 21 73 

SUPERCOMPUTERS N 406 481 18 122 

SUPERCONDUCTING FILMS N 317 862 0 65 

SUPERCONOUCTING MAGNETS N 822 943 30 379 

SUPERCONOUCTING POWER TRANSMISSION N 106 57 3 42 

SUPERCONDUCTING SUPER COLLIDER N 86 4 0 6 

SUPERCONDUCTIVITY N 1921 1681 180 773 

SUPERCONDUCTORS N 2066 2200 132 962 

SUPERCOOLING N 282 388 10 234 

SUPERCRITICAL AIRFOILS N 66 96 0 31 

SUPERCRITICAL FLOW N 273 429 5 126 

SUPERCRITICAL FLUIDS N 77 30 3 23 

SUPERCRITICAL PRESSURES N 62 113 2 41 

SUPERCRITICAL WINGS N 356 306 7 343 

SUPERFLUIOITY N 373 376 42 122 

SUPERGIANT STARS N 197 2055 7 56 

SUPERGRAVITY N 49 96 1 6 

SUPERHARMONICS N 8 38 1 0 

SUPERHEATING N 168 193 10 106 

SUPERHETERODYNE RECEIVERS N 74 254 2 52 

SUPERHIGH FREQUENCIES N 1622 3145 3 1953 

SUPERHYBRID MATERIALS N 3 2 0 8 

SUPERLATTICES N 299 813 4 88 

SUPERMASSIVE STARS N 10 302 2 5 

SUPERNOVA REMNANTS N 226 2404 12 71 

SUPERNOVA 1987A N 54 658 0 14 

SUPERNOVAE N 450 2865 48 168 

SUPERPLASTICITY N 216 805 10 158 

SUPERPOSITION (MATHEMATICS) N 115 535 5 25 

SUPERPRESSURE BALLOONS N 17 45 0 6 

SUPERROTATION N 3 18 0 4 

SUPERSATURATION N 200 358 5 94 

SUPERSONIC AIRCRAFT N 628 961 57 984 

SUPERSONIC AIRFOILS N 62 164 2 44 

SUPERSONIC BOUNDARY LAYERS N 100 504 3 64 

SUPERSONIC COMBUSTION N 176 252 3 255 

SUPERSONIC COMBUSTION RAMJET ENGINES N 287 478 0 618 

SUPERSONIC COMMERCIAL AIR TRANSPORT N 79 42 3 90 

SUPERSONIC COMPRESSORS N 98 158 2 36 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SUPERSONIC CRUISE AIRCRAFT RESEARCH N 113 40 3 117 

SUPERSONIC DIFFUSERS N 69 128 2 63 

SUPERSONIC DRAG N 65 98 1 66 

SUPERSONIC FLIGHT N 246 503 29 451 

SUPERSONIC FLOW N 2635 6230 78 1672 1

SUPERSONIC FLUTTER N 57 274 3 42 

SUPERSONIC HEAT TRANSFER N 28 95 0 40 

SUPERSONIC INLETS N 233 253 1 216 

SUPERSONIC JET FLOW N 212 1090 3 98 

SUPERSONIC LOW ALTITUDE MISSILE N 0 8 0 17 

SUPERSONIC NOZZLES N 284 771 10 265 

SUPERSONIC SPEED N 898 533 23 1036 

SUPERSONIC TEST APPARATUS N 14 22 2 21 

SUPERSONIC TRANSPORTS N 384 747 36 616 

SUPERSONIC TURBINES N 61 104 2 39 

SUPERSONIC WAKES N 63 195 1 38 

SUPERSONIC WIND TUNNELS N 430 552 10 434 

SUPERSONICS N 42 47 16 58 

SUPERSYMMETRY N 120 72 0 5 

SUPINE POSITION N 37 161 2 6 

SUPPLEMENTS N 22 4 25 12 

SUPPLYING N 311 67 111 249 

SUPPORT INTERFERENCE N 48 141 2 20 

SUPPORT SYSTEMS N 299 416 23 869 

SUPPORTS N 571 558 24 805 

SUPPRESSORS N 269 88 2 381 

SURFACE ACOUSTIC WAVE DEVICES N 314 1310 22 202 

SURFACE COOLING N 126 259 2 68 

SURFACE CRACKS N 387 1915 13 198 

SURFACE DEFECTS N 473 1070 16 256 

SURFACE DIFFUSION N 237 893 13 107 

SURFACE DISTORTION N 166 440 3 60 

SURFACE EFFECT SHIPS N 30 105 5 52 

SURFACE ENERGY N 331 534 15 127 

SURFACE FINISHING N 1402 1804 136 945 

SURFACE GEOMETRY N 196 2690 30 107 

SURFACE IONIZATION N 75 126 4 43 

SURFACE LAYERS N 969 2548 21 501 

SURFACE NAVIGATION N 354 428 45 229 

SURFACE NOISE INTERACTIONS N 4 6 0 3 

SURFACE PROPERTIES N 5101 5838 359 2996 1

SURFACE REACTIONS N 2058 2631 276 890 

SURFACE ROUGHNESS N 1633 1973 21 1048 

SURFACE ROUGHNESS EFFECTS N 547 2610 6 172 

SURFACE STABILITY N 151 225 4 134 

SURFACE TEMPERATURE N 1863 4269 10 949 

SURFACE TO AIR MISSILES N 110 119 4 2409 

SURFACE TO SURFACE MISSILES N 126 30 3 2025 

SURFACE TO SURFACE ROCKETS N 3 1 1 15 

SURFACE TREATMENT N 3 27 0 4 
NASA COMBINED FILE POSTING STATISTICS 

910117 

-******* SUBJECT TERM "'****** TYPE STAR IAA NLN OTHER 

SURFACE VEHICLES N 533 553 42 654 

SURFACE WATER N 560 165 21 557 

SURFACE WAVES N 1190 2516 76 827 

SURFACES N 319 160 51 257 

SURF ACT ANTS N 210 90 34 128 

SURGEONS N 2 3 7 11 

SURGERY N 112 189 83 149 

SURGES N 802 359 50 739 

SURGICAL INSTRUMENTS N 17 17 2 21 

SURINAM N 3 4 0 2 

SURVEILLANCE N 441 274 23 1357 

SURVEILLANCE RADAR N 328 749 10 307 

SURVEYOR LUNAR PROBES N 99 104 3 89 

SURVEYOR PROJECT N 50 49 17 115 

SURVEYOR 1 LUNAR PROBE N 11 17 3 14 

SURVEYOR 2 LUNAR PROBE N 3 0 2 2 

SURVEYOR 3 LUNAR PROBE N 61 48 1 20 

SURVEYOR 4 LUNAR PROBE N 4 0 0 0 

SURVEYOR 5 LUNAR PROBE N 15 17 1 2 

SURVEYOR 6 LUNAR PROBE N 11 7 2 1 

SURVEYOR 7 LUNAR PROBE N 26 25 3 2 

SURVEYS N 1818 267 369 1619 

SURVIVAL N 338 327 87 615 

SURVIVAL EQUIPMENT N 115 225 20 209 

SUSPENDING (HANGING) N 155 294 5 132 

SUSPENDING (MIXING) N 197 316 15 96 

SUSPENSION SYSTEMS (VEHICLES) N 181 168 12 146 

SUSPENSIONS N 47 231 5 39 

SUSQUEHANNA RIVER BASIN (MD-NY-PA) N 52 1 1 18 

SUSTAINER ROCKET ENGINES N 13 13 1 93 

SUSTAINING N 2 4 0 1 

SWAGING N 32 29 0 63 

SWALLOWING N 3 5 0 1 

SWAN BANDS N 10 64 0 3 

SWARMING N 5 13 1 5 

SWATH (SHIP) N 0 23 0 3 

SWATH WIDTH N 26 28 0 6 

SWAZILAND N 2 5 0 3 

SWEAT N 42 113 3 13 

SWEAT COOLING N 121 207 0 135 

SWEDEN N 366 201 27 248 

SWEDISH SPACE PROGRAM N 54 59 0 5 

SWEEP ANGLE N 91 110 2 50 

SWEEP CIRCUITS N 19 45 1 17 

SWEEP EFFECT N 49 58 0 43 

SWEEP FREQUENCY N 111 245 2 127 

SWEEPBACK N 21 23 0 28 

SWELLING N 264 107 1 125 

SWEPT FORWARD WINGS N 105 237 1 126 

SWEPT WINGS N 564 733 3 454 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SWEPTBACK TAIL SURFACES N 4 5 0 6 

SWEPTBACK WINGS N 179 175 2 292 

SWIMMING N 34 81 12 51 

SWIMMING POOL REACTORS N 12 1 0 3 

SWINE N 63 66 5 49 

SWING TAIL ASSEMBLIES N 0 2 0 0 

SWING WINGS N 8 3 0 2 

SWINGBY TECHNIQUE N 56 164 0 20 

SWIRLING N 238 1164 4 97 

SWISS SPACE PROGRAM N 6 5 0 3 

SWITCHES N 447 109 26 562 

SWITCHING N 460 365 44 431 

SWITCHING CIRCUITS N 1311 2954 204 1582 

SWITCHING THEORY N 230 221 171 151 

SWITZERLAND N 132 102 21 91 

SWIVELS N 13 8 0 18 

SYENITE N 8 3 0 1 

SYLLABLES N 38 10 3 16 

SYMBIOSIS N 38 32 12 12 

SYMBIOTIC STARS N 26 306 1 3 

SYMBOLIC PROGRAMMING N 265 260 22 98 

SYMBOLS N 496 234 240 270 

SYMMETRICAL BODIES N 102 196 6 68 

SYMMETRY N 1628 1270 216 651 

SYMPATHETIC NERVOUS SYSTEM N 52 337 5 38 

SYMPHONIE SATELLITES N 152 173 0 30 

SYMPTOMOLOGY N 32 57 6 8 

SYNAPSES N 78 302 34 72 

SYNCHROCYCLOTRONS N 85 13 1 30 

SYNCHRONISM N 1007 1451 30 630 

SYNCHRONIZED OSCILLATORS N 51 372 1 34 

SYNCHRONIZERS N 87 110 2 77 

SYNCHRONOUS COMMUNICATIONS SATELLITE PROJ N 4 4 0 7 

SYNCHRONOUS EARTH OBSERVATORY SATELLITE N 5 8 0 10 

SYNCHRONOUS METEOROLOGICAL SATELLITE N 73 118 0 48 

SYNCHRONOUS MOTORS N 129 175 30 91 

SYNCHRONOUS PLATFORMS N 91 41 1 25 

SYNCHRONOUS SATELLITES N 986 2687 17 468 

SYNCHROPHASING N 3 67 0 0 

SYNCHROPHASOTRONS N 16 2 0 10 

SYNCHROSCOPES N 2 5 0 5 

SYNCHROTRON RADIATION N 700 2260 30 165 

SYNCHROTRONS N 504 53 10 288 

SYNCLINES N 6 2 0 4 

SYNCODERS N 5 1 2 3 

SYNCOM APOGEE ENGINES N 0 0 0 6 

SYNCOM SATELLITES N 25 48 2 25 

SYNCOM 1 SATELLITE N 0 1 0 0 

SYNCOM 2 SATELLITE N 1 2 0 0 

SYNCOM 3 SATELLITE N 4 7 0 6 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

SYNCOM 4 SATELLITE N 1 2 0 1 

SYNCOPE N 8 39 0 10 

SYNOPTIC MEASUREMENT N 220 539 8 116 

SYNOPTIC METEOROLOGY N 1729 2672 58 607 

SYNTAX N 1159 156 77 423 

SYNTECTIC ALLOYS N 4 0 0 0 

SYNTHANE N 60 103 2 57 

SYNTHESIS N 260 193 62 340 

SYNTHESIS (CHEMISTRY) N 1275 404 134 865 

SYNTHESIZERS N 42 16 2 20 

SYNTHETIC APERTURE RADAR N 1085 1753 11 640 

SYNTHETIC APERTURES N 102 328 2 45 

SYNTHETIC ARRAYS N 109 376 3 103 

SYNTHETIC FIBERS N 265 234 36 305 

SYNTHETIC FOOD N 6 0 0 5 

SYNTHETIC FUELS N 849 564 69 542 

SYNTHETIC METALS N 18 9 1 6 

SYNTHETIC RESINS N 217 110 46 169 

SYNTHETIC RUBBERS N 133 66 22 207 

SYNTONY N 10 0 0 1 

SYPHILIS N 1 1 1 2 

SYRIA N 8 8 2 3 

SYRINGES N 10 2 0 10 

SYSTEM EFFECTIVENESS N 1047 3724 45 2451 

SYSTEM FAILURES N 741 1790 24 673 

SYSTEM GENERATED ELECTROMAGNETIC PULSES N 28 58 1 19 

SYSTEM IDENTIFICATION N 287 940 31 46 

SYSTEMS N 56 9 46 138 

SYSTEMS ANALYSIS N 6917 5533 1083 6613 2

SYSTEMS COMPATIBILITY N 151 235 2 138 

SYSTEMS ENGINEERING N 12730 14306 1154 14090 4

SYSTEMS INTEGRATION N 972 1623 19 1017 

SYSTEMS MANAGEMENT N 505 344 160 404 

SYSTEMS SIMULATION N 494 1570 25 124 

SYSTEMS STABILITY N 370 5544 69 107 

SYSTOLE N 44 235 1 12 

SYSTOLIC ARRAYS N 56 219 0 17 

SYSTOLIC PRESSURE N 36 176 2 9 

T SHAPE N 38 114 0 43 

T TAIL SURFACES N 32 43 1 12 

T TAURI STARS N 70 750 4 24 

T-2 AIRCRAFT N 13 17 1 37 

T-28 AIRCRAFT N 8 16 0 14 

T-33 AIRCRAFT N 32 35 3 42 

T-34 ENGINE N 0 2 0 7 

T-37 AIRCRAFT N 21 12 0 18 

T-38 AIRCRAFT N 38 34 0 75 

T-38 ENGINE N 2 0 0 1 

T-39 AIRCRAFT N 21 11 3 26 

T-53 ENGINE N 11 10 0 26 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

T-55 ENGINE N 4 2 0 9 

T-56 ENGINE N 5 20 0 24 

T-58 ENGINE N 2 4 0 15 

T-58-GE-SB ENGINE N 0 0 0 8 

T-63 ENGINE N 5 1 1 0 6 

T-64 ENGINE N 2 2 0 18 

T-74 ENGINE N 0 0 0 3 

T-76 ENGINE N 0 0 0 8 

T-78 ENGINE N 0 0 0 3 

TABLES (DATA) N 12278 11001 1775 12747 3

TABLETS N 13 2 1 6 

TABS (CONTROL SURFACES) N 11 27 0 19 

TABULATION N 0 3 1 5 

TABULATION PROCESSES N 46 24 8 64 

TACAN N 121 186 4 298 

TACHISTOSCOPES N 20 61 0 13 

TACHOMETERS N 44 84 5 51 

TACHYCARDIA N 19 121 1 7 

TACHYONS N 18 76 0 8 

TACHYPNEA N 0 3 0 0 

TACKINESS N 7 12 1 3 

TACT PROGRAM N 7 7 0 28 

TACTICS N 236 122 30 1193 

TACTILE DISCRIMINATION N 74 115 3 36 

TACTILE SENSORS (ROBOTICS) N 57 57 0 14 

TAFEL LAW N 19 14 0 5 

TAGN N 2 3 0 2 

T A I L ASS E MB Ll E S N 328 291 4 507 

TAIL ROTORS N 58 52 1 61 

TAIL SURFACES N 48 68 0 42 

TAILLESS AIRCRAFT N 12 56 3 20 

TAIWAN N 97 80 48 131 

TAKEOFF N 655 522 15 667 

TAKEOFF RUNS N 69 316 4 41 

TALC N 9 19 5 17 

TALKING N 5 4 19 5 

TALOS MISSILE N 2 9 0 62 

TANDEM MIRRORS N 273 107 0 21 

TANDEM ROTOR HELICOPTERS N 18 19 0 13 

TANDEM WING AIRCRAFT N 20 36 0 6 

TANGENTS N 145 93 11 68 

TANGLING N 2 3 0 0 

TANK GEOMETRY N 51 69 0 60 

TANK TRUCKS N 17 4 2 33 

TANKER AIRCRAFT N 31 19 1 127 

TANKER SHIPS N 44 19 11 31 

TANKER TERMINALS N 9 1 0 16 

TANKERS N 4 2 0 2 

TANKS (COMBAT VEHICLES) N 83 26 4 194 

TANKS (CONTAINERS) N 285 181 13 429 
NASA COMBINED FILE POSTING STATISTICS 

910117 

***:.t<*** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

TANTALUM N 600 584 17 745 

TANTALUM ALLOYS N 249 501 7 288 

TANTALUM CARBIDES N 58 143 1 52 

TANTALUM COMPOUNDS N 85 144 1 87 

TANTALUM ISOTOPES N 7 10 0 3 

TANTALUM NITRIDES N 19 21 0 8 

TANTALUM OXIDES N 46 135 0 26 

TANZANIA N 13 20 5 6 

TAPE RECORDERS N 318 365 39 376 

TAPERED COLUMNS N 11 28 0 2 

TAPERING N 133 414 1 58 

TAPES N 35 74 3 79 

TAPS N 4 19 2 15 

TAR SANDS N 28 50 18 39 

TARGET ACQUISITION N 943 1719 17 4696 

TARGET DRONE AIRCRAFT N 41 35 2 381 

TARGET MASKING N 12 15 0 37 

TARGET RECOGNITION N 1213 1482 9 3522 

TARGET SIMULATORS N 75 108 0 109 

TARGET THICKNESS N 87 73 0 44 

TARGETS N 904 372 8 1732 

TARS N 68 14 4 63 

TARTAR MISSILE N 0 1 0 94 

TASK COMPLEXITY N 420 1226 6 127 

TASK PLANNING (ROBOTICS) N 23 12 0 9 

TASKS N 730 237 122 505 

TASMANIA N 10 17 0 8 

TASTE N 34 31 11 28 

TATB N 19 15 0 3 

TAURIO METEOROIDS N 6 35 0 3 

TAURUS CONSTELLATION N 17 187 0 6 

TAUTOMERS N 10 4 1 6 

TAXIING N 124 154 1 96 

TAXONOMY N 156 134 64 110 

TAYLOR INSTABILITY N 165 793 1 34 

TAYLOR MANIFEST ANXIETY SCALE N 2 4 0 0 

TAYLOR SERIES N 439 1347 25 153 

TO SATELLITES N 12 11 0 2 

TD-1 SATELLITE N 53 113 0 0 

TOR SATELLITES N 279 331 6 233 

TEA LASERS N 156 919 3 92 

TEACHING MACHINES N 86 23 17 68 

TEAMS N 61 41 16 169 

TEARING N 116 175 2 55 

TEARING MODES (PLASMAS) N 95 247 0 14 

TECHNETIUM N 37 32 5 8 

TECHNETIUM COMPOUNDS N 9 3 0 5 

TECHNETIUM FLUORIDES N 0 0 0 1 

TECHNETIUM ISOTOPES N 15 14 0 3 

TECHNICAL WRITING N 339 25 481 228 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *****-** TYPE STAR IAA NLN OTHER 

TECHNOLOGICAL FORECASTING N 1119 4112 222 902 

TECHNOLOGIES N 617 190 1102 1219 

TECHNOLOGY ASSESSMENT N 6450 8880 1035 4705 2

TECHNOLOGY FEASIBILITY SPACECRAFT N 5 32 0 8 

TECHNOLOGY TRANSFER N 2316 459 424 1818 

TECHNOLOGY UTILIZATION N 3978 5750 786 2497 1

TECTONICS N 1545 1357 157 845 

TEETERING N 26 10 0 4 

TEETH N 34 25 13 36 

TEFLON (TRADEMARK) N 392 431 3 297 

TEKTITE PROJECT N 11 6 1 6 

TEKTITES N 66 218 10 56 

TELECOMMUNICATION B 3030 1713 1477 4199 1

TELECONFERENCING N 111 107 18 90 

TELECONNECTIONS (METEOROLOGY) N 9 44 0 0 

TELEGRAPH SYSTEMS N 55 79 58 88 

TELEMETRY N 2102 1911 165 3091 

TELEOPERATORS N 598 478 16 332 

TELEPHONES N 184 47 153 315 

TELEPHONY N 307 603 55 236 

TELEPHOTOMETRY N 34 66 1 15 

TELEPRINTERS N 37 21 3 42 

TELEROBOTICS N 252 169 0 65 

TELESCOPES N 1327 3411 189 1523 

TELETYPEWRITER SYSTEMS N 65 30 3 162 

TELETYPEWRITERS N 52 11 3 66 

TELEVISION CAMERAS N 479 672 14 616 

TELEVISION EQUIPMENT N 316 271 89 570 

TELEVISION RECEIVERS N 120 159 19 66 

TELEVISION RECEPTION N 143 137 6 58 

TELEVISION SYSTEMS N 774 764 177 871 

TELEVISION TRANSMISSION N 587 854 86 252 

TELLURIC CURRENTS N 131 156 8 89 

TELLURIC LINES N 31 102 1 13 

TELLURIDES N 115 144 2 125 

TELLURIUM N 180 223 14 119 

TELLURIUM ALLOYS N 32 65 1 33 

TELLURIUM COMPOUNDS N 68 85 5 42 

TELLURIUM ISOTOPES N 38 13 1 8 

TELLUROMETERS N 14 3 3 19 

TELSTAR PROJECT N 3 1 2 0 

TELSTAR SATELLITES N 4 20 2 7 

TELSTAR 1 SATELLITE N 2 3 0 0 

TELSTAR 2 SATELLITE N 0 1 0 0 

TEMPEL 2 COMET N 8 35 0 0 

TEMPER (METALLURGY) N 58 71 5 28 

TEMPERATE REGIONS N 161 528 4 88 

TEMPERATURE N 1584 130 89 2242 

TEMPERATURE COMPENSATION N 96 325 2 71 

TEMPERATURE CONTROL N 1729 2920 109 1597 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******"' TYPE STAR IAA NLN OTHER 

TEMPERATURE DEPENDENCE N 1811 5958 7 721 

TEMPERATURE DISTRIBUTION N 2937 13290 25 1519 1

TEMPERATURE EFFECTS N 8448 24480 215 4474 3

TEMPERATURE GRADIENTS N 2832 4310 15 1454 

TEMPERATURE INVERSIONS N 310 482 6 104 

TEMPERATURE MEASUREMENT N 3708 5557 191 2183 1

TEMPERATURE MEASURING INSTRUMENTS N 465 570 30 361 

TEMPERATURE PROBES N 103 174 0 80 

TEMPERATURE PROFILES N 1482 3616 13 764 

TEMPERATURE RATIO N 45 13 0 38 

TEMPERATURE SCALES N 93 82 5 53 

TEMPERATURE SENSORS N 264 597 4 250 

TEMPERING N 201 399 4 116 

TEMPLATES N 86 92 11 78 

TEMPORAL DISTRIBUTION N 242 2135 1 114 

TEMPORAL RESOLUTION N 267 581 2 79 

TENDENCIES N 4 0 0 5 

TENDONS N 19 33 1 9 

TENITE N 0 7 0 0 

TENNESSEE N 151 49 17 132 

TENNESSEE VALLEY (AL-KY-TN) N 42 16 2 21 

TENSILE CREEP N 93 198 1 26 

TENSILE DEFORMATION N 194 769 2 79 

TENSILE PROPERTIES N 1491 1348 30 1432 

TENSILE STRENGTH N 1911 3917 49 1590 

TENSILE STRESS N 894 4932 11 509 

TENSILE TESTS N 1204 4763 20 750 

TENSIOMETER$ N 30 20 0 13 

TENSION N 76 83 1 46 

TENSOMETERS N 13 161 1 10 

TENSOR ANALYSIS N 390 1768 102 146 

TENSORS N 504 1070 113 210 

TEPHIGRAMS N 2 8 0 1 

TERBIUM N 76 60 0 42 

TERBIUM COMPOUNDS N 3 11 0 0 

TERBIUM ISOTOPES N 15 2 0 3 

TERCOM N 5 21 0 16 

TEREPHTHALATE N 9 23 0 4 

TERMINAL AREA ENERGY MANAGEMENT N 4 2 0 1 

TERMINAL BALLISTICS N 396 178 1 881 

TERMINAL CONFIGURED VEHICLE PROGRAM N 48 32 1 36 

TERMINAL FACILITIES N 483 871 24 318 

TERMINAL GUIDANCE N 265 478 12 1257 

TERMINAL VELOCITY N 71 160 0 33 

TERMINALS N 39 45 5 74 

TERMINATOR LINES N 9 127 0 8 

TERMINOLOGY N 291 82 537 174 

TERMS N 64 6 53 60 

TERNARY ALLOYS N 247 1619 16 87 

TERNARY SYSTEMS N 330 572 12 130 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*•***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

TERPENES N 19 26 12 11 

TERPHENYLS N 18 9 0 9 

TERRACES (LANDFORMS) N 8 7 0 5 

TE RRADYNAMI CS N 29 150 6 15 

TERRAIN N 1050 308 38 822 

TERRAIN ANALYSIS N 1134 1763 61 728 

TERRAIN FOLLOWING AIRCRAFT N 94 206 0 151 

TERRESTRIAL DUST BELT N 20 66 0 7 

TERRESTRIAL PLANETS N 73 458 8 68 

TERRESTRIAL RADIATION N 389 726 26 193 

TERRIER MISSILE N 4 6 0 125 

TERTIARY PERIOD N 0 2 0 1 

TESSERAL HARMONICS N 47 143 1 12 

TEST CHAMBERS N 356 514 4 322 

TEST EQUIPMENT N 1905 2651 99 2341 

TEST FACILITIES N 3404 3322 59 3428 1

TEST FIRING N 192 212 2 1091 

TEST PATTERN GENERATORS N 28 61 4 14 

TEST PILOTS N 30 106 25 23 

TEST RANGES N 112 148 4 116 

TEST STANDS N 300 454 0 399 

TEST VEHICLES N 117 143 3 253 

TESTES N 22 27 4 19 

TESTING TIME N 60 260 0 124 

TESTS N 393 156 191 878 

TETHERED BALLOONS N 111 170 6 71 

TETHERED SATELLITES N 198 452 4 62 

TETHERING N 155 152 3 106 

TETHERLINES N 164 212 6 96 

TETHYS N 5 38 0 1 

TETRABUTYLS N 2 1 0 3 

TETRACHLORIDES N 30 21 0 17 

TETRACYCLINES N 7 8 2 8 

TETRAD THEORY N 3 79 0 1 

TETRAETHYL ORTHDCARBONATES N 1 0 0 0 

TETRAETHYL ORTHOSILICATE N 4 0 0 1 

TETRAFLUOROHYORAZINE N 11 4 0 27 

TETRAGONS N 12 72 1 6 

TETRAHEDRONS N 67 111 2 24 

TETRAHYDROFURAN N 15 23 1 7 

TE TRAPHENY L S N 7 5 0 8 

TETRAZOLES N 19 4 0 26 

TETRODES N 31 66 3 46 

TETRYL N 15 9 0 15 

TEXAS N 781 207 108 511 

TEXTBOOKS N 213 77 956 206 

TEXTILES N 196 86 133 367 

TEXTS N 144 25 64 44 

TEXTURES N 540 936 22 174 

TF-30 ENGINE N 20 19 0 57 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**•  SUBJECT TERM ** ***** TYPE STAR IAA NLN OTHER 

TF-34 ENGINE N 17 24 0 35 

TF-41 ENGINE N 5 14 0 13 

TH-55 HELICOPTER N 0 1 0 2 

THAILAND N 78 62 7 69 

THALAMUS N 16 102 5 15 

THALLIUM N 156 143 9 84 

THALLIUM ALLOYS N 19 14 0 3 

THALLIUM COMPOUNDS N 80 223 1 29 

THALLIUM ISOTOPES N 11 27 1 3 

THEMATIC MAPPERS (LANDSAT) N 847 1038 0 129 

THEMATIC MAPPING N 1456 1918 31 270 

THEMIS PROJECT N 292 3 0 92 

THEODOLITES N 101 85 2 182 

THEODORSEN TRANSFORMATION N 9 25 0 2 

THEOREM PROVING N 2232 1638 156 1360 

THEOREMS N 1418 433 113 613 

THEORETICAL PHYSICS N 1967 789 644 606 

THEORIES N 114 21 207 74 

THERAPY N 164 213 191 208 

THERMAL ABSORPTION N 159 308 7 85 

THERMAL ANALYSIS N 763 1285 24 611 

THERMAL BARRIERS (PLASMA CONTROL) N 66 16 0 2 

THERMAL BATTERIES N 119 94 7 89 

THERMAL BLOOMING N 161 580 4 225 

THERMAL BOUNDARY LAYER N 143 1014 3 60 

THERMAL BUCKLING N 64 144 0 28 

THERMAL COMFORT N 43 118 4 18 

THERMAL CONDUCTIVITY N 2722 5232 124 1701 

THERMAL CONDUCTIVITY GAGES N 31 56 1 15 

THERMAL CONDUCTORS N 47 66 2 29 

THERMAL CONTROL COATINGS N 497 593 17 336 

THERMAL CYCLING TESTS N 842 1960 7 817 

THERMAL DECOMPOSITION N 193 424 2 154 

THERMAL DEGRADATION N 485 611 16 437 

THERMAL DIFFUSION N 539 1401 24 246 

THERMAL DIFFUSIVITY N 188 532 11 103 

THERMAL DISSOCIATION N 164 345 3 116 

THERMAL EMISSION N 393 1532 12 196 

THERMAL ENERGY N 1180 1524 73 585 

THERMAL ENVIRONMENTS N 284 410 9 307 

THERMAL EXPANSION N 1138 2171 28 890 

THERMAL FATIGUE N 347 1226 15 170 

THERMAL INSTABILITY N 126 777 3 73 

THERMAL INSULATION N 1423 1278 61 1717 

THERMAL MAPPING N 554 877 13 150 

THERMAL NEUTRONS N 640 152 10 233 

THERMAL NOISE N 171 857 7 60 

THERMAL PLASMAS N 256 904 3 81 

THERMAL POLLUTION N 225 142 43 213 

THERMAL PROTECTION N 829 1267 26 1070 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

THERMAL RADIATION N 1060 2155 59 967 

THERMAL REACTORS N 97 38 9 70 

THERMAL RESISTANCE N 812 2040 49 1068 

THERMAL RESOURCES N 34 38 3 22 

THERMAL SHOCK N 347 695 11 965 

THERMAL SIMULATION N 208 463 6 98 

THERMAL STABILITY N 1918 3458 32 2560 

THERMAL STRESSES N 1724 4884 95 1764 

THERMAL VACUUM TESTS N 346 590 3 117 

THERMALIZATION (ENERGY ABSORPTION) N 74 238 2 20 

THERMICONS N 5 3 0 11 

THERMIONIC CATHODES N 73 163 2 43 

THERMIONIC CONVERTERS N 372 732 18 388 

THERMIONIC DIODES N 103 163 7 79 

THERMIONIC EMISSION N 199 393 13 158 

THERMIONIC EMITTERS N 88 241 2 98 

THERMIONIC POWER GENERATION N 180 265 24 304 

THERMIONICS N 35 32 10 55 

THERMISTORS N 278 289 12 226 

THERMITES N 27 6 0 15 

THERMOBALANCES N 9 18 2 15 

THERMOCHEMICAL PROPERTIES N 230 317 14 183 

THERMOCHEMISTRY N 920 782 172 722 

THERMOCHROMATIC MATERIALS N 26 11 2 13 

THERMOCLINES N 230 154 5 207 

THERMOCOUPLE PYROMETERS N 18 56 1 12 

THERMOCOUPLES N 916 1064 33 1035 

THERMODYNAMIC COUPLING N 101 171 0 35 

THERMODYNAMIC CYCLES N 376 945 20 236 

THERMODYNAMIC EFFICIENCY N 607 1415 10 287 

THERMODYNAMIC EQUILIBRIUM N 713 3308 86 310 

THERMODYNAMIC PROPERTIES N 5120 4361 595 4468 1

THERMODYNAMICS N 3775 3402 1317 2560 1

THERMOELASTICITY N 366 2704 53 136 

THERMOELECTRIC COOLING N 91 113 11 133 

THERMOELECTRIC GENERATORS N 392 496 16 431 

THERMOELECTRIC MATERIALS N 104 319 13 144 

THERMOELECTRIC POWER GENERATION N 298 436 17 397 

THERMOELECTRICITY N 340 531 56 302 

THERMOELEMENT AMMETERS N 3 3 0 3 

THERMOGRAPHY N 79 331 16 47 

THERMOGRAVIMETRY N 371 386 21 279 

THERMOHYDRAULICS N 117 292 13 35 

THERMOLUMINESCENCE N 358 226 11 125 

THERMOMAGNETIC COOLING N 11 21 1 12 

THERMOMAGNETIC EFFECTS N 54 252 12 35 

THERMOMECHANICAL TREATMENT N 218 950 9 96 

THERMOMETERS N 246 247 55 173 

THERMOMIGRATION N 9 11 0 7 

THERMONUCLEAR EXPLOSIONS N 49 139 3 27 
NASA COMBINED FILE POSTING STATISTICS 

910117 

__..****** SUBJECT TERM **•  TYPE STAR IAA NLN OTHER 

THERMONUCLEAR POWER GENERATION N 228 236 14 137 

THERMONUCLEAR REACTIONS N 457 536 17 251 

THERMOPHILE$ N 18 64 0 22 

THERMOPHILIC PLANTS N 8 7 1 10 

THERMOPHORESIS N 13 54 0 3 

THERMOPHYSICAL PROPERTIES N 487 1184 83 408 

THERMOPILES N 68 102 1 45 

THERMOPLASTIC FILMS N 32 63 4 38 

THERMOPLASTIC RESINS N 453 1148 65 498 

THERMOPLASTICITY N 175 548 36 133 

THERMORECEPTOR$ N 14 89 2 2 

THERMOREGULATION N 351 939 45 164 

THERMOSETTING RESINS N 241 538 44 226 

THERMOSIPHONS N 54 124 3 21 

THERMOSPHERE N 559 2205 26 198 

THERMOSTATS N 67 104 11 73 

THERMOVISCOELASTICITY N 60 253 5 23 

THESAURI N 119 11 58 64 

THESES N 342 7 30 172 

THETA PINCH N 354 574 3 100 

THIAMINE N 16 17 2 4 

THIAZINE (TRADEMARK) N 4 8 0 5 

THICK FILMS N 361 351 48 224 

THICK PLATES N 89 304 0 29 

THICK WALLS N 186 357 1 94 

THICKENERS N 1 3 0 0 

THICKENERS (EQUIPMENT) N 4 2 0 1 

THICKENERS (MATERIALS) N 28 20 0 35 

THICKNESS N 1854 1925 11 1395 

THICKNESS RATIO N 249 273 4 97 

THIGH N 6 7 1 1 

THIN AIRFOILS N 69 372 0 27 

THIN BODIES N 25 421 3 7 

THIN FILMS N 5474 8247 318 3241 1

THIN LAYER CHROMATOGRAPHY N 81 64 42 72 

THIN PLATES N 480 2994 17 151 

THIN WALLED SHELLS N 536 3671 55 232 

THIN WALLS N 269 710 27 192 

THIN WINGS N 142 378 6 97 

THIOLS N 127 84 8 76 

THIOPLASTICS N 6 11 0 2 

THIOUREAS N 14 17 0 14 

THIURONIUM N 1 5 0 0 

THIXOTROPY N 23 14 0 32 

THOMAS-FERMI MODEL N 61 109 3 20 

THOMSON SCATTERING N 200 510 3 88 

THOR ABLE ROCKET VEHICLE N 1 1 0 6 

THOR AGENA LAUNCH VEHICLE N 11 2 0 30 

THOR DELTA LAUNCH VEHICLE N 17 28 0 25 

THOR LAUNCH VEHICLES N 5 9 0 38 
NASA COMBINED FILE POSTING STATISTICS 

910117 

** ***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

THORAO LAUNCH VEHICLES N 5 0 0 6 

THORAX N 46 114 4 39 

THORIUM N 296 160 19 299 

THORIUM ALLOYS N 46 29 4 38 

THORIUM COMPOUNDS N 89 31 5 62 

THORIUM FLUORIDES N 11 8 1 5 

THORIUM ISOTOPES N 86 88 0 26 

THORIUM OXIDES N 155 149 4 126 

THREADS N 76 73 19 95 

THREAT EVALUATION N 86 71 0 442 

THREE AXIS STABILIZATION N 124 376 0 20 

THREE BODY PROBLEM N 357 1901 46 99 

THREE DIMENSIONAL BODIES N 217 583 3 63 

THREE DIMENSIONAL BOUNDARY LAYER N 437 1053 9 179 

THREE DIMENSIONAL COMPOSITES N 89 280 1 89 

THREE DIMENSIONAL FLOW N 2699 5891 41 1030 

THREE DIMENSIONAL MODELS N 977 1633 0 157 

THREE DIMENSIONAL MOTION N 339 632 7 130 

THRESHOLD CURRENTS N 114 1303 2 75 

THRESHOLD DETECTORS (DOSIMETERS) N 87 53 1 36 

THRESHOLD GATES N 76 107 0 53 

THRESHOLD LOGIC N 91 155 13 56 

THRESHOLD VOLTAGE N 76 381 0 8 

THRESHOLDS N 138 1493 1 66 

THRESHOLDS (PERCEPTION) N 412 978 15 157 

THROATS N 118 101 1 214 

THROMBIN N 14 12 5 5 

THROMBOCYTES N 13 36 0 1 

THROMBOPENIA N 2 2 0 0 

THROMBOPLASTIN N 7 10 0 1 

THROMBOSIS N 26 56 12 15 

THROTTLING N 120 222 0 224 

THROWING N 1 0 0 3 

THRUST N 483 395 16 850 

THRUST AUGMENTATION N 274 334 3 374 

THRUST BEARINGS N 142 325 9 133 

THRUST CHAMBER PRESSURE N 48 43 0 104 

THRUST CHAMBERS N 304 301 3 1174 

THRUST CONTROL N 303 547 4 456 

THRUST DISTRIBUTION N 26 37 0 19 

THRUST LOADS N 90 107 1 92 

THRUST MEASUREMENT N 199 288 7 187 

THRUST PROGRAMMING N 66 207 4 42 

THRUST REVERSAL N 121 218 1 115 

THRUST TERMINATION N 14 32 1 109 

THRUST VECTOR CONTROL N 540 828 5 1466 

THRUST-WEIGHT RATIO N 101 278 0 59 

THRUSTORS N 3 161 0 7 

THULIUM N 53 44 0 27 

THULIUM COMPOUNDS N 22 27 0 8 
910117 

NASA 

******* SUBJECT TERM ******* 

THULIUM ISOTOPES 

THYMUS 

THYMOL 

THYMINE 

THYMIDINE 

THUNDERSTORMS 

GLAND 

THYROID 

THYRISTORS 

THYRATRONS 

GLAND 

TIDAL 

TIBIA 

TIBET 

THYROXINE 

FLATS 

TIDAL WAVES 

TIDE POWERED GENERATORS 

TIDE POWERED MACHINES 

TIDE POWER 

TI 

TIDES 

EBOL TS 

TILT 

TILES 

TIGHTNESS 

ROTOR AIRCRAFT 

COMBINED 

TILT ROTOR RESEARCH AIRCRAFT PROGRAM 

TILT WING AIRCRAFT 

TILTED PROPELLERS 

TILTING ROTORS 

TIMBER 

TILTMETERS 

IDENTIFICATION 

TIMBER INVENTORY 

TIMBER VIGOR 

TIME 

TIME 

TIMBERLINE 

CONSTANT 

TIME DEPENDENCE 

TIME DISCRIMINATION 

TIME DIVISION MULTIPLE ACCESS 

TIME DIVISION MULTIPLEXING 

TIME FUNCTIONS 

TIME LAG 

TIME MARCHING 

TIME MEASUREMENT 

TIME MEASURING INSTRUMENTS 

TIME OF FLIGHT SPECTROMETERS 

TIME OPTIMAL CONTROL 

TIME RESPONSE 

TIME SERIES ANALYSIS 

TIME SHARING 

TIME SIGNALS 

TIME TEMPERATURE PARAMETER 

TIMING DEVICES 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

STAR 

27 

1010 

12 

19 

2 

41 

207 

100 

13 

62 

32 

17 

12 

15 

67 

0 

13 

694 

9 

30 

139 

81 

17 

98 

14 

52 

36 

59 

226 

53 

5 

1606 

210 

3688 

69 

663 

284 

167 

1238 

971 

179 

69 

191 

216 

481 

1537 

360 

820 

44 

291 

STATISTICS 

IAA 

4 

1610 

87 

74 

21 

21 

142 

387 

25 

40 

48 

46 

149 

61 

6 

68 

1019 

2 

93 

19 

193 

11 

80 

20 

66 

37 

137 

270 

172 

0 

676 

299 

14436 

92 

1071 

746 

4808 

1242 

515 

1487 

74 

394 

1806 

5672 

1296 

373 

144 

280 

470 

46 

NLN 

3 

3 

0 

0 

1 

10 

61 

0 

0 

0 

10 

11 

0 

6 

18 

103 

6 

0 

0 

0 

1 

0 

1 

2 

0 

0 

17 

4 

172 

3 

37 

5 

3 

5 

21 

19 

0 

97 

6 

17 

11 

7 

106 

121 

15 

0 

15 

OTHER 

13 

378 

12 

2 

3 

25 

321 

182 

49 

8 

4 

8 

13 

60 

29 

5 

22 

445 

6 

35 

170 

14 

64 

14 

12 

83 

12 

76 

49 

63 

1863 

111 

1221 

45 

26 

596 

233 

210 

15 

480 

41 

123 

80 

72 

193 

500 

644 

27 

372 

1
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

TIMOSHENKO BEAMS N 40 393 2 8 

TIN N 567 377 26 333 

TIN ALLOYS N 293 478 4 190 

TIN COMPOUNDS N 159 108 9 105 

TIN ISOTOPES N 39 17 1 13 

TIN OXIDES N 146 288 1 105 

TIN TELLURIDES N 41 139 0 38 

TIP DRIVEN ROTORS N 35 27 0 16 

TIP SPEED N 154 236 1 79 

TIP VANES N 24 5 0 4 

TIPS N 41 58 2 32 

TIRES N 246 71 32 256 

TIROS M N 5 2 0 5 

TIROS N SERIES SATELLITES N 111 264 0 26 

TIROS OPERATIONAL SATELLITE SYSTEM N 31 28 0 54 

TIROS PROJECT N 19 2 4 27 

TIROS SATELLITES N 113 148 2 158 

TIROS 1 SATELLITE N 2 2 0 26 

TIROS 10 SATELLITE N 3 0 0 4 

TIROS 2 SATELLITE N 3 1 0 18 

TIROS 3 SATELLITE N 1 3 1 29 

TIROS 4 SATELLITE N 5 2 0 19 

TIROS 5 SATELLITE N 0 0 0 13 

TIROS 6 SATELLITE N 4 1 0 19 

TIROS 7 SATELLITE N 16 9 0 37 

TIROS 8 SATELLITE N 0 3 0 17 

TIROS 9 SATELLITE N 6 3 0 20 

TISSUES (BIOLOGY) N 833 996 192 717 

TITAN N 174 526 6 144 

TITAN CENTAUR LAUNCH VEHICLE N 6 9 0 6 

TITAN ICBM N 5 6 1 62 

TITAN LAUNCH VEHICLES N 70 107 2 227 

TIT AN PROJECT N 3 8 1 40 

TITAN 1 ICBM N 1 1 0 8 

TITAN 2 ICBM N 2 6 1 181 

TITAN 3 LAUNCH VEHICLE N 87 74 0 198 

TITANATES N 113 118 2 82 

TITANIA N 5 30 0 0 

TITANIUM N 1609 2636 88 1312 

TITANIUM ALLOYS N 2702 8482 92 2513 1

TITANIUM BORIDES N 85 213 0 40 

TITANIUM CARBIDES N 155 613 3 62 

TITANIUM CHLORIDES N 38 42 0 9 

TITANIUM COMPOUNDS N 283 395 8 182 

TITANIUM ISOTOPES N 25 47 0 3 

TITANIUM NITRIDES N 83 299 0 39 

TITANIUM OXIDES N 459 782 3 171 

TITRATION N 198 84 32 121 

TITRIMETERS N 19 5 9 5 

TOBACCO N 34 47 4 18 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**•  SUBJECT TERM ** ***** TYPE STAR IAA NLN OTHER 

TOCOPHEROL N 15 41 3 12 

TOGO N 3 1 0 0 

TOILETS N 5 12 8 4 

TOKAMAK DEVICES N 2093 3248 44 607 

TOLERANCES (MECHANICS) N 433 508 57 821 

TOLERANCES (PHYSIOLOGY) N 430 157 16 341 

TOLLMIEN-SCHLICHTING WAVES N 139 377 0 52 

TOLUENE N 197 97 0 134 

TOMAHAWK MISSILES N 7 22 1 45 

TOMATOES N 7 6 0 0 

TOMOGRAPHY N 257 403 32 173 

TONGUE N 3 8 0 3 

TONK METEORITE N 0 1 0 0 

TOOLING N 122 180 24 192 

TOOLS N 285 111 71 721 

TOOTH DISEASES N 5 8 8 17 

TOPE X N 47 94 0 30 

TOPOGRAPHY N 2494 2204 132 1627 

TOPOLOGY N 1759 1519 426 821 

TOPPING CYCLE ENGINES N 29 37 0 3 

TOPS (SPACECRAFT) N 19 19 0 11 

TORCHES N 53 28 3 56 

TORNADOES N 271 321 24 123 

TORO ASTEROID N 3 4 0 0 

TOROIDAL DISCHARGE N 73 60 1 23 

TOROIDAL PLASMAS N 1206 2514 15 244 

TOROIDAL SHELLS N 75 227 0 54 

TOROIDAL WHEELS N 3 6 0 0 

TOROIDS N 308 380 6 214 

TORPEDO ENGINES N 1 2 0 17 

TORPEDOES N 30 12 4 330 

TORQUE N 1234 1625 29 901 

TORQUE CONVERTERS N 22 9 0 14 

TORQUE MOTORS N 108 91 2 74 

TORQUE SENSORS (ROBOTICS) N 35 29 0 9 

TORQUEMETERS N 79 93 2 65 

TORQUERS N 50 41 0 44 

TORRES STRAIT N 3 2 0 1 

TORSION N 576 958 71 235 

TORSIONAL STRESS N 346 2027 16 146 

TORSIONAL VIBRATION N 191 1049 7 72 

TORSO N 23 31 0 3 

TORUSES N 189 243 4 50 

TORY 2 REACTOR N 0 1 0 3 

TORY 2-A REACTOR N 0 0 0 28 

TORY 2-C REACTOR N 0 0 0 48 

TOTAL ENERGY SYSTEMS N 17 17 3 22 

TOTAL OZONE MAPPING SPECTROMETER N 58 92 0 9 

TOUCH N 71 73 11 58 

TOUCHDOWN N 55 70 1 42 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

TOUGHNESS N 514 336 12 398 

TOURMALINE N 6 6 0 2 

TOURNIQUETS N 3 2 0 1 

TOW MISSILES N 3 1 0 37 

TOWED BODIES N 189 94 2 409 

TOWER SHIELDING REACTOR 2 N 0 0 0 2 

TOWERS N 347 221 18 234 

TOWING N 64 40 2 131 

TOWNSEND AVALANCHE N 5 18 1 1 

TOWNSEND DISCHARGE N 14 29 4 5 

TOXIC DISEASES N 49 44 22 39 

TOXIC HAZARDS N 776 371 159 707 

TOXICITY N 1016 339 154 1043 

TOXICITY AND SAFETY HAZARD N 243 126 47 194 

TOXICOLOGY N 438 230 393 479 

TOXINS AND ANTITOXINS N 63 13 23 195 

TRACE CONTAMINANTS N 534 526 47 316 

TRACE ELEMENTS N 1052 1342 142 621 

TRACERS N 88 217 11 56 

TRACHEA N 11 30 4 5 

TRACHYTE N 1 2 0 0 

TRACING N 13 34 2 11 

TRACKED VEHICLES N 35 2 0 46 

TRACKING (POSITION) N 1370 1114 24 1338 

TRACKING FILTERS N 126 785 2 55 

TRACKING NETWORKS N 325 280 10 271 

TRACKING PROBLEM N 44 522 3 23 

TRACKING RADAR N 221 460 16 296 

TRACKING STATIONS N 373 478 13 314 

TRACKS N 18 29 1 11 

TRACTION N 194 340 10 89 

TRACTORS N 51 17 3 62 

TRADEOFFS N 849 1193 14 1289 

TRADE SCANT! A N 3 9 0 1 

TRADEX RADAR SYSTEM N 0 0 0 4 

TRAFFIC N 311 75 85 237 

TRAFFIC CONTROL N 254 340 68 216 

TRAGACANTH N 0 0 0 1 

TRAILBLAZER 1 REENTRY VEHICLE N 0 0 0 4 

TRAILBLAZER 2 REENTRY VEHICLE N 9 2 0 23 

TRAILERS N 44 17 2 98 

TRAILING EDGE FLAPS N 110 108 0 137 

TRAILING EDGES N 749 1523 2 425 

TRAINING AIRCRAFT N 101 226 13 282 

TRAINING ANALYSIS N 211 111 26 96 

TRAINING DEVICES N 601 230 79 714 

TRAINING EVALUATION N 234 240 14 255 

TRAINING SIMULATORS N 329 610 17 275 

TRAJECTORIES N 893 190 24 914 

TRAJECTORY ANALYSIS N 1327 3239 26 2408 
NASA COMBINED FILE POSTING STATISTICS 

910117 

•*-***** SUBJECT TERM •*•**** TYPE STAR IAA NLN OTHER 

TRAJECTORY CONTROL N 328 1054 9 309 

TRAJECTORY MEASUREMENT N 127 288 6 148 

TRAJECTORY OPTIMIZATION N 601 2556 28 389 

TRAJECTORY PLANNING N 97 95 0 9 

TRANQU ILl ZERS N 28 37 4 21 

TRANSATMOSPHERIC VEHICLES N 20 88 0 30 

TRANSCENDENTAL FUNCTIONS N 112 372 37 51 

TRANSCONDUCTANCE N 7 251 0 6 

TRANSCONTINENTAL SYSTEMS N 33 25 2 8 

TRANSDUCERS N 1211 924 136 1541 

TRANSEARTH INJECTION N 2 5 0 30 

TRANSEQUATORIAL PROPAGATION N 32 111 0 9 

TRANSFER FUNCTIONS N 2460 5814 78 1158 

TRANSFER OF TRAINING N 151 198 37 81 

TRANSFER ORBITS N 529 1412 29 449 

TRANSFER TUNNELS N 12 8 2 9 

TRANSFERRED ELECTRON DEVICES N 13 72 0 22 

TRANSFERRING N 195 32 14 349 

TRANSFORMATIONS N 63 64 10 46 

TRANSFORMATIONS (MATHEMATICS) N 2125 3853 251 915 

TRANSFORMERS N 519 449 126 1226 

TRANSFUSION N 15 15 1 25 

TRANSGRANULAR CORROSION N 8 20 0 2 

TRANSHORIZON RADIO PROPAGATION N 19 165 1 3 

TRANSIENT HEATING N 159 732 4 66 

TRANSIENT LOADS N 171 359 9 92 

TRANSIENT OSCILLATIONS N 110 325 4 54 

TRANSIENT PRESSURES N 117 112 2 70 

TRANSIENT REACTOR TEST FACILITY N 25 2 0 12 

TRANSIENT RESPONSE N 1202 5192 39 524 

TRANSISTOR AMPLIFIERS N 222 1055 40 452 

TRANSISTOR CIRCUITS N 301 1938 188 271 

TRANSISTOR LOGIC N 57 198 8 78 

TRANSISTORS N 752 629 282 1814 

TRANSIT N 3 10 0 0 

TRANSIT ATTITUDE CONTROL SATELLITE N 0 2 0 2 

TRANSIT NAVIGATION SYSTEM N 2 9 0 0 

TRANSIT SATELLITES N 73 154 1 29 

TRANSIT TIME N 108 1129 7 57 

TRANSITION N 72 80 11 62 

TRANSITION FLIGHT N 2 1 0 3 

TRANS IT I ON FLOW N 285 1324 8 163 

TRANSITION LAYERS N 37 246 1 27 

TRANSITION METALS N 1082 1120 180 525 

TRANSITION POINTS N 248 295 4 107 

TRANSITION PRESSURE N 25 14 1 16 

TRANSITION PROBABILITIES N 438 1827 19 179 

TRANSITION TEMPERATURE N 844 1399 11 316 

TRANSITS N 15 49 4 16 

TRANSLATING N 169 43 132 139 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

TRANSLATIONAL MOTION N 226 788 5 82 

TRANSLATORS N 23 50 2 22 

TRANSLUCENCE N 12 30 1 13 

TRANSLUNAR INJECTION N 20 6 1 153 

TRANSMISSION N 196 76 53 281 

TRANSMISSION CIRCUITS N 92 98 12 59 

TRANSMISSION EFFICIENCY N 466 4288 18 194 

TRANSMISSION FLUIDS N 16 19 1 14 

TRANSMISSION LINES N 1423 1921 139 1279 

TRANSMISSION LOSS N 569 2263 10 294 

TRANSMISSIONS (MACHINE ELEMENTS) N 335 254 26 220 

TRANSMISSIVITY N 185 374 0 120 

TRANSMISSOMETERS N 91 73 3 35 

TRANSMITTANCE N 543 1302 1 507 

TRANSMITTER RECEIVERS N 441 598 3 900 

TRANSMITTERS N 596 397 39 897 

TRANSMUTATION N 56 37 5 21 

TRANSOCEANIC COMMUNICATION N 21 113 1 15 

TRANSOCEANIC FLIGHT N 4 35 0 3 

TRANSOCEANIC SYSTEMS N 16 58 4 9 

TRANSONIC COMPRESSORS N 113 152 1 25 

TRANSONIC FLIGHT N 125 170 5 187 

TRANSONIC FLOW N 2461 4443 86 1338 

TRANSONIC FLUTTER N 103 168 0 67 

TRANSONIC NOZZLES N 36 89 1 14 

TRANSONIC SPEED N 601 231 11 753 

TRANSONIC WIND TUNNELS N 1102 786 16 840 

TRANSPARENCE N 489 1370 21 455 

TRANSPIRATION N 174 155 9 95 

TRANSPLANTATION N 28 27 13 80 

TRANSPONDER CONTROL GROUP N 4 8 0 4 

TRANSPONDERS N 521 1263 8 714 

TRANSPORT AIRCRAFT N 1689 2142 139 1845 

TRANSPORT PROPERTIES N 3352 3035 281 1664 

TRANSPORT THEORY N 1288 1343 175 374 

TRANSPORT VEHICLES N 73 115 8 72 

TRANSPORTATION N 1073 277 588 1276 

TRANSPORTATION ENERGY N 312 381 20 228 

TRANSPORTATION NETWORKS N 79 65 6 56 

TRANSPORTER N 25 4 2 42 

TRANSPUTERS N 74 80 0 7 

TRANSURANIUM ELEMENTS N 116 18 5 33 

TRANSVERSE ACCELERATION N 94 59 0 32 

TRANSVERSE OSCILLATION N 113 665 3 60 

TRANSVERSE WAVES N 382 1774 4 137 

TRAP PROGRAM N 5 3 0 40 

TRAPATT DEVICES N 19 61 3 25 

TRAPEZOIDAL TAIL SURFACES N 3 1 0 5 

TRAPEZOIDAL WINGS N 26 47 0 18 

TRAPEZOIDS N 26 100 0 8 
910117 

NASA 

******* SUBJECT TERM ******* 

TRAPPED MAGNETIC FIELDS 

TRAPPED PARTICLES 

TRAPPED VORTICES 

TRAVELING 

TRAVEL 

TRAPS 

TRAPPING 

CHARGE 

COMBINED 

TRAVELING IONOSPHERIC DISTURBANCES 

TRAVELING SALESMAN PROBLEM 

TRAVELING SOLVENT METHOD 

TRAVELING WAVE AMPLIFIERS 

TRAVELING WAVE MASERS 

TRAVELING WAVE MODULATION 

TRAVELING WAVE TUBES 

TRAVELING WAVES 

TREES 

TREES 

TREATMENT 

TREADS 

TREADMILLS 

TRAYS 

(MATHEMATICS) 

TREES (PLANTS) 

TREND 

TREMORS 

ANALYSIS 

TRESCA 

TRENDS 

FLOW 

TRIAMINOGUANIDINIUM 

TRIACETIN 

AZIDE 

TRIATOMIC 

TRIANGULATION 

TRIANGLES 

MOLECULES 

TRIAXIAL STRESSES 

TRIDENT 

TRIBUTARIES 

TRIBOLUMINESCENCE 

TRIBOLOGY 

TRIBOLIA 

SUBMARINE 

TRIETHYL 

TRIENES 

COMPOUNDS 

TRIFLUOROAMINE OXIDE 

TRIGGER 

TRIGATRONS 

CIRCUITS 

TRIGONOMETRIC FUNCTIONS 

TRIMETHYL 

TRIMETHADIONE 

TRIMERS 

TRIGONOMETRY 

COMPOUNDS 

TRINIDAD AND TOBAGO 

TRINITRO 

TRINITRAMINE 

COMPOUNDS 

FILE 

TYPE 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

N 

POSTING 

747 

135 

STAR 

10 

254 

28 

49 

98 

15 

62 

65 

11 

15 

81 

456 

484 

31 

21 

49 

62 

19 

336 

817 

69 

32 

330 

23 

1 

603 

144 

93 

39 

5 

438 

0 

10 

0 

4 

20 

0 

10 

165 

246 

30 

50 

0 

50 

9 

0 

1 

STATISTICS 

60 

IAA 

1556 

12 

118 

275 

77 

11 

468 

53 

4 

116 

140 

554 

1803 

1163 

6 

247 

7 

26 

17 

188 

582 

89 

31 

168 

250 

0 

3 

103 

137 

719 

416 

8 

544 

4 

3 

11 

1 

27 

5 

0 

615 

480 

28 

73 

0 

63 

1 

4 

18 

NLN 

3 

10 

4 

5 

0 

86 

0 

4 

1 

1 

15 

18 

0 

1 

17 

2 

62 

45 

5 

4 

78 

7 

0 

0 

2 

21 

4 

4 

48 

8 

0 

0 

0 

0 

1 

9 

0 

85 

138 

0 

0 

1 

0 

0 

1 

OTHER 

20 

257 

4 

30 

80 

67 

6 

9 

22 

3 

12 

23 

99 

1023 

174 

22 

39 

45 

22 

23 

145 

227 

13 

50 

165 

3 

7 

3 

52 

439 

61 

14 

2 

153 

0 

30 

19 

5 

18 

8 

8 

229 

11 

50 

95 

1 

29 

0 

7 

11 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

TRINITROTOLUENE N 164 58 0 175 

TRIODES N 108 182 6 122 

TRIOLS N 1 0 0 2 

TRIPHENYL SILICON N 0 0 0 1 

TRIPHENYLS N 12 10 0 9 

TRIPLE STARS N 6 87 0 0 

TRIPODS N 5 2 0 8 

TRISONIC WIND TUNNELS N 11 10 0 8 

TRITIUM N 619 576 18 239 

TRITON N 14 125 0 8 

TRITONS N 99 13 0 18 

TRIVALENT IONS N 46 52 2 16 

TROILITE N 14 141 0 10 

TROJAN ORBITS N 9 84 1 4 

TROMBE WALLS N 48 26 1 26 

TROPICAL METEOROLOGY N 548 1709 29 193 

TROPICAL REGIONS N 955 1893 85 603 

TROPICAL STORMS N 456 289 9 163 

TROPISM N 18 9 0 6 

TROPOPAUSE N 170 422 2 77 

TROPOSPHERE N 1510 3687 62 735 

TROPOSPHERIC RADIATION N 29 68 2 21 

TROPOSPHERIC SCATTERING N 293 290 9 177 

TROPOSPHERIC WAVES N 52 214 5 20 

TROPYL COMPOUNDS N 2 0 0 1 

TROUGHS N 115 124 1 30 

TRUCKS N 291 75 32 352 

TRUNCATION ERRORS N 286 1032 0 58 

TRUSSES N 519 924 40 177 

TRYPANOSOME N 0 6 0 2 

TRYPSIN N 13 15 0 14 

TRYPTAMINE$ N 3 16 0 1 

TRYPTOPHAN N 21 49 1 7 

TS-11 AIRCRAFT N 0 2 0 1 

TSR-2 AIRCRAFT N 1 1 0 1 

TSUNAMI WAVES N 91 38 9 85 

TTL INTEGRATED CIRCUITS N 67 143 12 209 

TU-104 AIRCRAFT N 3 6 1 2 

TU-121 ENGINE N 0 0 0 1 

TU-124 AIRCRAFT N 2 0 0 2 

TU-134 AIRCRAFT N 1 29 1 4 

TU-144 AIRCRAFT N 5 22 0 4 

TU-154 AIRCRAFT N 3 20 0 10 

TUBE ANODES N 32 31 0 28 

TUBE CATHODES N 56 53 0 113 

TUBE GRIDS N 51 36 1 94 

TUBE HEAT EXCHANGERS N 258 228 8 114 

TUBE LASERS N 2 5 0 0 

TUBERCULOSIS N 11 11 3 5 

TUBES N 108 368 1 123 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

TUMBLING MOTION N 53 84 0 45 

TUMORS N 74 102 43 75 

TUNABLE LASERS N 427 1654 9 340 

TUNDRA N 36 21 4 35 

TUNERS N 35 50 1 54 

TUNGSTATE$ N 38 26 4 26 

TUNGSTEN N 1354 1924 44 1096 

TUNGSTEN ALLOYS N 380 1059 9 345 

TUNGSTEN CARBIDES N 126 324 7 65 

TUNGSTEN CHLORIDES N 5 6 0 0 

TUNGSTEN COMPOUNDS N 123 118 3 91 

TUNGSTEN FLUORIDES N 18 14 0 12 

TUNGSTEN HALIDES N 9 1 0 1 

TUNGSTEN ISOTOPES N 21 7 0 6 

TUNGSTEN OXIDES N 42 106 1 40 

TUNGUSK METEORITE N 11 129 2 10 

TUNING N 503 1893 6 480 

TUNING FORK GYROSCOPES N 7 19 0 6 

TUNISIA N 14 41 3 4 

TUNNEL CATHODES N 7 5 1 8 

TUNNEL DIODES N 136 788 10 136 

TUNNELING N 17 65 2 6 

TUNNELING (EXCAVATION) N 78 17 14 100 

TUNNELS N 39 46 9 40 

TUPOLEV AIRCRAFT N 3 18 0 10 

TURBIDITY N 335 567 15 177 

TURBINE BLADES N 2174 4015 44 1270 

TURBINE ENGINES N 724 864 41 673 

TURBINE EXHAUST NOZZLES N 45 69 0 46 

TURBINE INSTRUMENTS N 30 98 3 41 

TURBINE PUMPS N 441 445 11 830 

TURBINE WHEELS N 216 1204 13 168 

TURBINES N 736 331 54 833 

TURBOCOMPRESSORS N 959 1849 27 566 

TURBOFAN AIRCRAFT N 46 103 0 35 

TURBOFAN ENGINES N 1143 1600 10 1831 

TURBOFANS N 263 273 5 171 

TURBOGENERATORS N 415 555 17 438 

TURBOJET ENGINE CONTROL N 46 131 7 38 

TURBOJET ENGINES N 713 857 41 1249 

TURBOMACHINE BLADES N 354 792 15 187 

TURBOMACHINERY N 1091 1194 153 747 

TURBOPAUSE N 10 59 1 1 

TURBOPROP AIRCRAFT N 187 311 7 153 

TURBOPROP ENGINES N 202 396 9 298 

TURBORAMJET ENGINES N 22 41 1 52 

TURBOROCKET ENGINES N 19 37 2 30 

TURBOSHAFTS N 144 324 4 235 

TURBULENCE N 2271 751 209 1610 

TURBULENCE EFFECTS N 631 3314 13 248 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM  -** * TYPE STAR IAA NLN OTHER 

TURBULENCE METERS N 120 437 4 46 

TURBULENCE MODELS N 920 1788 0 127 

TURBULENT BOUNDARY LAYER N 3028 5932 80 1489 1

TURBULENT DIFFUSION N 611 2079 20 232 

TURBULENT FLOW N 5145 10879 225 2249 1

TURBULENT HEAT TRANSFER N 333 1481 14 139 

TURBULENT JETS N 405 1853 15 118 

TURBULENT MIXING N 741 1886 16 322 

TURBULENT WAKES N 587 1371 13 298 

TURING MACHINES N 186 107 25 65 

TURKEY N 40 34 7 32 

TURKEYS N 5 1 0 3 

TURKISH SPACE PROGRAM N 0 0 0 0 

TURNAROUND (STS) N 9 29 0 8 

TURNING FLIGHT N 164 317 3 124 

TURNSTILE ANTENNAS N 16 32 1 7 

TURPENTINE N 0 0 2 0 

TURRET N 7 9 0 8 

TURRET LATHES N 6 1 1 5 

TURTLES N 12 36 2 20 

TVD SCHEMES N 106 222 0 4 

TWENTY-FOUR HOUR ORBITS N 44 64 1 52 

TWENTY-SEVEN DAY VARIATION N 38 353 2 2 

TWILIGHT GLOW N 75 378 4 29 

TWINNING N 148 259 7 81 

TWISTED WINGS N 35 57 0 31 

TWISTING N 108 481 2 51 

TWITCHING N 4 25 0 1 

TWO BODY PROBLEM N 346 828 10 123 

TWO DIMENSIONAL BODIES N 397 651 5 146 

TWO DIMENSIONAL BOUNDARY LAYER N 159 676 3 55 

TWO DIMENSIONAL FLOW N 2818 8584 46 944 1

TWO DIMENSIONAL JETS N 68 542 1 22 

TWO DIMENSIONAL MODELS N 977 1747 0 139 

TWO FLUID MODELS N 92 612 3 18 

TWO PHASE FLOW N 1342 2663 85 618 

TWO REFLECTOR ANTENNAS N 55 309 2 6 

TWO STAGE PLASMA ENGINES N 1 1 0 1 

TWO STAGE TURBINES N 49 60 0 17 

TWO-WAVELENGTH LASERS N 17 168 0 4 

TX-354 ENGINE N 3 1 0 4 

TX-77 ENGINE N 1 0 0 0 

TYCHO CRATER N 16 17 0 6 

TYPE 2 BURSTS N 24 328 0 7 

TYPE 3 BURSTS N 70 636 0 14 

TYPE 4 BURSTS N 30 307 1 6 

TYPE 5 BURSTS N 0 32 0 0 

TYPEWRITERS N 23 9 25 27 

TYPHOID N 0 1 0 10 

TYPHON WEAPON SYSTEM N 0 0 0 3 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

TYPHOONS N 159 116 3 80 

TYPHUS N 0 2 0 10 

TYROSINE N 13 2 0 4 

U BENDS N 16 16 0 4 

U SPIN SPACE N 20 1 0 3 

U.S.S.R. N 4616 1929 537 4993 1

U.S.S.R. SPACE PROGRAM N 730 1187 110 544 

U-10 AIRCRAFT N 2 0 0 5 

U-2 AIRCRAFT N 96 59 3 87 

UBV SPECTRA N 41 3558 7 18 

UDIMET ALLOYS N 30 110 0 13 

UGANDA N 2 5 1 0 

UH-1 HELICOPTER N 217 85 0 236 

UH-2 HELICOPTER N 6 1 0 5 

UH-34 HELICOPTER N 0 2 0 2 

UH-60A HELICOPTER N 42 80 0 53 

UH-61A HELICOPTER N 0 24 0 1 

UHURU SATELLITE N 24 229 0 10 

UK SATELLITES N 38 65 0 14 

UK SPACE PROGRAM N 3 42 0 2 

UK 4 SATELLITE N 7 0 0 1 

ULCERS N 47 20 0 17 

ULLAGE N 44 17 0 95 

ULLAGE ROCKET ENGINES N 2 6 0 15 

ULNA N 10 7 0 6 

ULTRAHIGH FREQUENCIES N 1491 1937 19 2194 

ULTRAHIGH VACUUM N 361 364 6 180 

ULTRALIGHT AIRCRAFT N 15 42 11 13 

ULTRAPURE METALS N 104 411 6 45 

ULTRASHORT PULSED LASERS N 35 1764 7 14 

ULTRASONIC AGITATION N 41 99 2 25 

ULTRASONIC CLEANING N 18 15 0 12 

ULTRASONIC DENSIMETERS N 4 0 0 0 

ULTRASONIC FLAW DETECTION N 323 1209 6 130 

ULTRASONIC LIGHT MODULATION N 13 126 2 5 

ULTRASONIC MACHINING N 36 93 9 29 

ULTRASONIC RADIATION N 788 784 70 532 

ULTRASONIC SCANNERS N 65 87 1 42 

ULTRASONIC SOLDERING N 8 19 4 10 

ULTRASONIC SPECTROSCOPY N 37 95 0 23 

ULTRASONIC TESTS N 1154 1914 91 733 

ULTRASONIC WAVE TRANSDUCERS N 218 768 11 116 

ULTRASONIC WELDING N 77 85 15 65 

ULTRASONICS N 811 352 184 562 

ULTRAVIOLET ABSORPTION N 199 663 1 1 68 

ULTRAVIOLET ASTRONOMY N 599 1887 14 197 

ULTRAVIOLET DETECTORS N 15 68 0 23 

ULTRAVIOLET FILTERS N 27 65 1 31 

ULTRAVIOLET LASERS N 217 1158 7 134 

ULTRAVIOLET MICROSCOPY N 7 6 1 5 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ULTRAVIOLET PHOTOGRAPHY N 44 169 3 42 

ULTRAVIOLET PHOTOMETRY N 192 525 1 87 

ULTRAVIOLET RADIATION N 2062 3137 85 1733 

ULTRAVIOLET REFLECTION N 47 109 1 27 

ULTRAVIOLET SPECTRA N 1233 4052 86 559 

ULTRAVIOLET SPECTROMETERS N 250 449 9 216 

ULTRAVIOLET SPECTROPHOTOMETERS N 104 167 3 36 

ULTRAVIOLET SPECTROSCOPY N 450 881 53 245 

ULTRAVIOLET TELESCOPES N 43 118 0 43 

ULYSSES MISSION N 91 115 1 25 

UMBILICAL CONNECTORS N 54 13 1 96 

UMBILICAL TOWERS N 25 6 0 54 

UMBRAS N 20 244 0 8 

UMBRIEL N 6 31 0 1 

UMKEHR EFFECT N 15 53 0 2 

UMKLAPP PROCESS N 6 6 0 1 

UNCAMBERED WINGS N 9 12 0 2 

UNCONSCIOUSNESS N 2 66 5 5 

UNCONTROLLED REENTRY (SPACECRAFT) N 30 23 1 4 

UNCOUPLED MODES N 28 37 0 3 

UNDAMPED OSCILLATIONS N 20 72 0 9 

UNDER SURFACE BLOWING N 4 2 0 1 

UNDERCARRIAGES N 47 43 0 17 

UNDERGROUND ACOUSTICS N 7 2 0 0 

UNDERGROUND COMMUNICATION N 35 15 4 46 

UNDERGROUND EXPLOSIONS N 480 30 9 650 

UNDERGROUND STORAGE N 491 101 20 257 

UNDERGROUND STRUCTURES N 199 118 19 226 

UNDERGROUND TRANSMISSION LINES N 50 2 8 27 

UNDERWATER ACOUSTICS N 1324 168 80 1833 

UNDERWATER BREATHING APPARATUS N 43 10 3 51 

UNDERWATER COMMUNICATION N 148 35 8 270 

UNDERWATER ENGINEERING N 268 30 84 357 

UNDERWATER EXPLOSIONS N 135 34 4 191 

UNDERWATER OPTICS N 85 146 28 75 

UNDERWATER PHOTOGRAPHY N 54 24 20 60 

UNDERWATER PHYSIOLOGY N 29 32 4 6 

UNDERWATER PROPULSION N 25 18 4 84 

UNDERWATER RESEARCH LABORATORIES N 7 12 3 15 

UNDERWATER RESOURCES N 34 7 8 34 

UNDERWATER STRUCTURES N 197 53 17 199 

UNDERWATER TESTS N 195 111 9 177 

UNDERWATER TO SURFACE MISSILES N 7 4 0 140 

UNDERWATER TRAJECTORIES N 15 8 0 74 

UNDERWATER VEHICLES N 225 44 13 279 

UNIDENTIFIED FLYING OBJECTS N 10 13 78 7 

UNIFIED FIELD THEORY N 59 359 13 34 

UNIFIED S BAND N 22 3 0 59 

UNIFORM FLOW N 124 663 3 51 

UNIMOLECULAR STRUCTURES N 26 19 3 7 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *•**•** TYPE STAR IAA NLN OTHER 

UNIONIZATION N 4 2 69 6 

UNIONS N 1 1 11 2 

UNIONS (CONNECTORS) N 11 9 0 29 

UNIQUENESS N 137 89 7 25 

UNIQUENESS THEOREM N 176 1865 18 38 

UNITED ARAB EMIRATES N 0 1 0 4 

UNITED KINGDOM N 683 800 372 531 

UNITED NATIONS N 118 518 134 65 

UNITED STATES N 1958 1784 4610 2440 

UNITS OF MEASUREMENT N 163 56 73 56 

UNITY N 21 4 3 8 

UNIVAC COMPUTERS N 78 17 3 81 

UNIVAC LARC COMPUTER N 1 0 0 0 

UNIVAC 1100 SERIES COMPUTERS N 45 4 0 9 

UNIVAC 1105 COMPUTER N 1 0 0 0 

UNIVAC 1106 COMPUTER N 11 2 0 15 

UNIVAC 1107 COMPUTER N 8 1 0 48 

UNIVAC 1108 COMPUTER N 215 10 1 1049 

UNIVAC 1110 COMPUTER N 24 1 0 4 

UNIVAC 1230 COMPUTER N 1 0 0 1 

UNIVAC 418 COMPUTER N 0 1 0 1 

UNIVAC 490 COMPUTER N 0 0 0 5 

UNIVAC 494 COMPUTER N 0 0 0 3 

UNIVAC 80 COMPUTER N 0 1 0 1 

UNIVERSAL TIME N 142 303 5 65 

UNIVERSE N 351 2780 261 124 

UNIVERSITIES N 635 163 641 1136 

UNIVERSITY PROGRAM N 340 144 45 448 

UNIX (OPERATING SYSTEM) N 122 42 0 33 

UNLOADING N 55 136 1 46 

UNLOADING WAVES N 4 32 0 0 

UNMANNED SPACECRAFT N 327 355 29 408 

UNSATURATION (CHEMISTRY) N 21 11 2 28 

UNSTEADY AERODYNAMICS N 741 1266 0 164 

UNSTEADY FLOW N 2180 6517 65 725 

UNSTEADY STATE N 131 1002 12 46 

UNSWEPT WINGS N 36 29 0 27 

UP-CONVERTERS N 14 96 0 16 

UPGRADING N 80 27 4 90 

UPLINKING N 164 346 8 91 

UPPER ATMOSPHERE N 2354 3207 192 1856 

UPPER ATMOSPHERE RESEARCH SATELLITE (UARS) N 0 11 0 3 

UPPER IONOSPHERE N 56 604 1 104 

UPPER STAGE ROCKET ENGINES N 66 215 1 399 

UPPER SURFACE BLOWING N 35 55 0 11 

UPPER SURFACE BLOWN FLAPS N 56 37 0 24 

UPSETTING N 8 16 1 5 

UPSTREAM N 67 405 0 15 

UP WASH N 68 66 0 19 

UPWELLING WATER N 227 170 5 132 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM **•***>t- TYPE STAR IAA NLN OTHER 

URACIL N 6 23 0 9 

URANIUM N 1146 301 87 1264 

URANIUM ALLOYS N 253 33 6 188 

URANIUM CARBIDES N 176 16 2 173 

URANIUM COMPOUNDS N 306 61 8 191 

URANIUM FLUORIDES N 140 65 0 61 

URANIUM ISOTOPES N 162 138 2 69 

URANIUM OXIDES N 841 70 5 522 

URANIUM PLASMAS N 16 16 0 19 

URANIUM 232 N 10 1 0 2 

URANIUM 233 N 95 16 1 30 

URANIUM 234 N 11 5 0 10 

URANIUM 235 N 277 59 2 117 

URANIUM 238 N 170 70 0 40 

URANUS (PLANET) N 207 653 15 189 

URANUS ATMOSPHERE N 37 200 1 36 

URANUS RINGS N 25 177 1 13 

URANUS SATELLITES N 19 109 0 16 

URBAN DEVELOPMENT N 673 245 174 497 

URBAN PLANNING N 737 325 204 606 

URBAN RESEARCH N 266 919 62 171 

URBAN TRANSPORTATION N 796 805 154 656 

UREAS N 125 88 6 95 

UREILITES N 9 79 0 2 

URETHANES N 112 77 27 125 

URIC ACID N 10 20 4 9 

URIDYLIC ACID N 0 5 0 1 

URINALYSIS N 145 213 4 75 

URINATION N 27 63 2 17 

URINE N 225 206 14 185 

UROGRAPHY N 0 1 0 0 

UROLITHIASIS N 0 3 2 3 

UROLOGY N 15 20 8 10 

URUGUAY N 3 2 1 3 

USER MANUALS (COMPUTER PROGRAMS) N 3081 12 169 1782 

USER REQUIREMENTS N 2845 1608 50 1489 

UTAH N 264 99 44 220 

UTERUS N 6 9 1 1 

UTILITIES N 710 463 106 464 

UTILITY AIRCRAFT N 52 130 10 96 

UTILIZATION N 452 211 459 1032 

UTRICLE N 3 3 0 1 

V GROOVES N 31 151 1 16 

V-1 MISSILE N 1 3 2 0 

V-2 MISSILE N 5 23 6 2 

V-22 AIRCRAFT N 0 65 0 1 

V/STOL AIRCRAFT N 894 1227 52 1003 

VACANCIES (CRYSTAL DEFECTS) N 434 552 9 112 

VACCINES N 33 22 12 181 

VACILLATION N 8 18 0 4 
NASA COMBINED FILE POSTING STATISTICS 

910117 

*****'~'-* SUBJECT TERM •****** TYPE STAR IAA NLN OTHER 

VACUUM N 814 810 112 703 

VACUUM APPARATUS N 429 363 58 552 

VACUUM ARC SWITCHES N 15 6 0 13 

VACUUM CHAMBERS N 699 929 10 525 

VACUUM DEPOSITION N 355 749 15 241 

VACUUM EFFECTS N 304 1572 15 196 

VACUUM FURNACES N 99 168 4 66 

VACUUM GAGES N 34 43 6 39 

VACUUM MELTING N 124 308 13 74 

VACUUM PUMPS N 157 217 20 140 

VACUUM SPECTROSCOPY N 63 100 10 44 

VACUUM SYSTEMS N 279 423 35 217 

VACUUM TESTS N 154 443 4 54 

VACUUM TUBE OSCILLATORS N 6 31 2 16 

VACUUM TUBES N 95 162 81 81 

VADOSE WATER N 12 1 4 10 

VALENCE N 361 539 52 160 

VALERIC ACID N 1 1 0 1 

VALIANT AIRCRAFT N 0 0 0 2 

VALIDITY N 104 48 3 34 

VALLEYS N 225 180 24 91 

VALSALVA EXERCISE N 3 33 0 2 

VALUE N 219 28 47 215 

VALUE ENGINEERING N 251 132 86 162 

VALVES N 462 282 49 1190 

VAMPIRE MK 35 AIRCRAFT N 2 0 0 0 

VAN BIESBROECK STAR N 0 1 0 0 

VAN DE GRAAFF ACCELERATORS N 207 59 3 88 

VAN DER WAAL FORCES N 163 297 9 52 

VAN SLYKE METHOD N 1 2 0 1 

VANADATE$ N 27 19 0 12 

VANADIUM N 541 408 25 248 

VANADIUM ALLOYS N 478 1784 10 291 

VANADIUM CARBIDES N 28 85 0 9 

VANADIUM COMPOUNDS N 122 136 1 56 

VANADIUM ISOTOPES N 17 18 0 5 

VANADIUM OXIDES N 97 169 2 60 

VANADYL COMPOUNDS N 9 7 0 2 

VANADYL RADICAL N 5 0 0 1 

VANELESS DIFFUSERS N 39 126 0 12 

VANES N 322 349 5 165 

VANGUARD PROJECT N 3 0 6 4 

VANGUARD SATELLITES N 3 8 2 4 

VANGUARD 1 SATELLITE N 1 1 0 1 

VANGUARD 2 LAUNCH VEHICLE N 1 2 0 0 

VANGUARD 2 SATELLITE N 3 0 0 1 

VANGUARD 3 SATELLITE N 3 2 0 2 

VAPOR BARRIER CLOTHING N 4 2 0 4 

VAPOR DEPOSITION N 1624 2765 40 1300 

VAPOR JETS N 13 24 0 10 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

VAPOR PHASE EPITAXY N 108 435 1 112 

VAPOR PHASES N 1386 1528 114 723 

VAPOR PRESSURE N 744 796 31 421 

VAPOR TRAPS N 9 10 1 22 

VAPORIZERS N 84 73 2 75 

VAPORIZING N 589 779 20 410 

VAPORS N 537 82 39 510 

VARACTOR DIODE CIRCUITS N 17 110 2 17 

VARACTOR DIODES N 92 496 9 197 

VARIABILITY N 638 707 33 304 

VARIABLE N 45 64 11 49 

VARIABLE CYCLE ENGINES N 77 72 2 95 

VARIABLE GEOMETRY STRUCTURES N 155 1004 10 135 

VARIABLE MASS SYSTEMS N 49 264 4 17 

VARIABLE PITCH PROPELLERS N 65 63 1 46 

VARIABLE STARS N 417 4661 74 680 

VARIABLE STREAM CONTROL ENGINES N 5 7 0 5 

VARIABLE SWEEP WINGS N 105 161 1 308 

VARIABLE THRUST N 56 91 0 118 

VARIANCE N 47 74 1 12 

VARIANCE (STATISTICS) N 855 1242 39 257 

VARIATIONAL PRINCIPLES N 579 4719 81 159 

VARIATIONS N 1446 298 44 864 

VARIOMETERS N 79 60 0 106 

VARISTORS N 51 49 3 58 

VARNISHES N 43 22 18 77 

VASOCONSTRICTION N 49 239 5 13 

VASOCONSTRICTOR DRUGS N 2 40 2 2 

VA SOD I LA TION N 32 196 8 14 

VATICAN CITY N 1 1 0 2 

VATOL AIRCRAFT N 10 7 0 7 

VAX COMPUTERS N 158 150 4 47 

VAX-11 SERIES COMPUTERS N 49 8 5 11 

VAX-11/780 COMPUTER N 87 29 0 27 

VC-10 AIRCRAFT N 16 16 0 11 

VECTOR ANALYSIS N 1069 2961 236 428 

VECTOR CURRENTS N 174 51 2 49 

VECTOR DOMINANCE MODEL N 46 7 1 9 

VECTOR MESONS N 220 14 1 52 

VECTOR PROCESSING (COMPUTERS) N 25 141 0 9 

VECTOR QUANTIZATION N 5 20 0 1 

VECTOR SPACES N 604 748 152 247 

VECTORCARDIOGRAPHY N 33 183 10 13 

VECTORS (MATHEMATICS) N 1232 1477 140 449 

VEGA LAUNCH VEHICLE N 1 14 0 21 

VEGA PROJECT N 142 315 0 28 

VEGARD-KAPLAN BANDS N 5 14 0 5 

VEGETABLES N 64 46 15 56 

VEGETATION N 1706 1213 86 708 

VEGETATION GROWTH N 408 455 49 212 
NASA COMBINED FILE POSTING STATISTICS 

910117 

 "'**  SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

VEGETATIVE INDEX N 136 368 1 29 

VEHICLE WHEELS N 163 75 10 154 

VEHICLES N 74 27 18 92 

VEHICULAR TRACKS N 65 69 2 51 

VEINS N 40 179 8 67 

VELA SATELLITES N 71 171 1 12 

VELOCITY N 1722 354 66 1703 

VELOCITY COUPLING N 51 7 0 22 

VELOCITY DISTRIBUTION N 3508 17154 24 1372 2

VELOCITY ERRORS N 76 506 1 57 

VELOCITY MEASUREMENT N 2089 4141 60 1035 

VELOCITY MODULATION N 50 139 1 27 

VENEERS N 13 0 0 6 

VENERA SATELLITES N 185 750 5 71 

VENERA 10 SATELLITE N 6 47 0 8 

VENERA 11 SATELLITE N 5 49 0 4 

VENERA 12 SATELLITE N 1 46 0 5 

VENERA 2 SATELLITE N 2 4 0 0 

VENERA 3 SATELLITE N 2 3 0 0 

VENERA 4 SATELLITE N 27 96 0 7 

VENERA 5 SATELLITE N 5 19 0 0 

VENERA 6 SATELLITE N 3 28 0 0 

VENERA 7 SATELLITE N 1 11 0 1 

VENERA 8 SATELLITE N 11 39 0 2 

VENERA 9 SATELLITE N 9 70 0 9 

VENEZIANO MODEL N 62 2 0 11 

VENEZUELA N 38 24 6 19 

VENN DIAGRAMS N 3 7 3 3 

VENTILATION N 443 369 133 363 

VENTILATION FANS N 35 39 7 25 

VENTILATORS N 24 29 5 33 

VENTING N 152 84 0 200 

VENTRAL SECTIONS N 3 12 0 1 

VENTS N 87 41 1 127 

VENTURI TUBES N 93 96 1 52 

VENUS (PLANET) N 524 997 69 621 

VENUS ATMOSPHERE N 477 2352 28 355 

VENUS CLOUDS N 62 451 2 63 

VENUS FLY TRAP ROCKET VEHICLE N 0 0 0 5 

VENUS ORBITING IMAGING RADAR (SPACECRAFT) N 5 18 0 7 

VENUS PROBES N 196 297 13 145 

VENUS RADAR ECHOES N 14 117 0 8 

VENUS SURFACE N 142 447 2 72 

VERBAL COMMUNICATION N 182 141 117 91 

VERMICULITE N 11 5 0 6 

VERMONT N 61 25 7 38 

VERNEUIL PROCESS N 12 10 0 5 

VERNIER ENGINES N 19 25 0 87 

VERONIQUE ROCKET VEHICLES N 9 5 0 4 

VERSATILITY N 22 23 0 14 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

VERTEBRAE N 54 46 4 15 

VERTEBRATES N 42 91 65 63 

VERTICAL AIR CURRENTS N 463 1546 3 130 

VERTICAL DISTRIBUTION N 935 8558 7 379 

VERTICAL FLIGHT N 67 140 20 65 

VERTICAL JUNCTION SOLAR CELLS N 5 6 0 2 

VERTICAL LANDING N 91 229 10 122 

VERTICAL MOTION N 289 1224 6 106 

VERTICAL MOTION SIMULATORS N 12 9 0 14 

VERTICAL ORIENTATION N 521 112 0 420 

VERTICAL PERCEPTION N 81 127 3 32 

VERTICAL TAKEOFF N 82 154 9 106 

VERTICAL TAKEOFF AIRCRAFT N 694 809 55 1469 

VERTICAL 8 ROCKET N 0 0 0 

VERTIGO N 72 59 2 15 

VERY HIGH FREQUENCIES N 859 1314 18 1028 

VERY HIGH FREQUENCY RADIO EQUIPMENT N 105 132 4 148 

VERY LARGE ARRAY (VLA) N 116 791 0 17 

VERY LARGE SCALE INTEGRATION N 702 1201 80 256 

VERY LONG BASE INTERFEROMETRY N 486 1443 5 159 

VERY LONG BASELINE ARRAY (VLBA) N 6 24 0 1 

VERY LOW FREQUENCIES N 776 2073 11 664 

VESSELS N 19 43 5 16 

VESTA ASTEROID N 17 103 1 7 

VESTIBULAR NYSTAGMUS N 73 200 5 26 

VESTIBULAR TESTS N 447 660 17 161 

VESTIBULES N 264 300 29 144 

VESTS N 31 5 0 27 

VETERINARY MEDICINE N 22 1 15 1 1 

VHF OMNIRANGE NAVIGATION N 140 231 4 17 

VHSIC (CIRCUITS) N 69 277 6 330 

VIABILITY N 99 29 1 120 

VIBRATION N 2302 295 457 2582 

VIBRATION DAMPING N 1534 5023 58 616 

VIBRATION EFFECTS N 932 1707 47 597 

VIBRATION ISOLATORS N 466 724 36 357 

VIBRATION MEASUREMENT N 689 1146 52 421 

VIBRATION METERS N 95 122 6 53 

VIBRATION MODE N 856 5206 17 335 

VIBRATION PERCEPTION N 27 102 2 13 

VIBRATION SIMULATORS N 169 256 3 83 

VIBRATION TESTS N 1437 1854 52 2371 

VIBRATIONAL FREEZING N 11 11 0 2 

VIBRATIONAL SPECTRA N 1068 3843 108 475 

VIBRATIONAL STRESS N 326 418 20 183 

VIBRATORY LOADS N 252 345 9 139 

VIBRATORY POLISHING N 8 14 2 9 

VICTOR MK-1 AIRCRAFT N 0 0 0 4 

VIDEO COMMUNICATION N 195 498 33 105 

VIDEO DATA N 615 789 33 492 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

VIDEO DISKS N 54 19 8 49 

VIDEO EQUIPMENT N 500 598 60 415 

VIDEO LANDMARK ACQUISITION AND TRACKING N 5 4 0 5 

VIDEO SIGNALS N 122 149 0 137 

VIDEO TAPE RECORDERS N 37 49 0 31 

VIDEO TAPES N 15 13 0 9 

VIDICONS N 278 382 5 420 

VIETNAM N 35 26 11 74 

VIEW EFFECTS N 70 135 1 21 

VIEWING N 97 55 5 105 

VIGNETTING N 14 19 0 4 

VIKING LANDER SPACECRAFT N 155 358 11 97 

VIKING LANDER 1 N 16 85 2 6 

VIKING LANDER 2 N 8 47 2 4 

VIKING MARS PROGRAM N 169 320 33 137 

VIKING ORBITER SPACECRAFT N 141 242 4 48 

VIKING ORBITER 1 N 11 38 2 2 

VIKING ORBITER 1975 N 14 46 1 24 

VIKING ORBITER 2 N 7 31 1 2 

VIKING ROCKET VEHICLE N 9 20 1 16 

VIKING SPACECRAFT N 56 145 3 39 

VIKING 1 SPACECRAFT N 12 20 0 4 

VIKING 2 SPACECRAFT N 12 12 0 2 

VIKING 75 ENTRY VEHICLE N 18 20 1 27 

VINEYARDS N 14 14 2 1 

VINTI THEORY N 7 13 0 1 

VINYL COPOLYMERS N 91 20 13 52 

VINYL POLYMERS N 243 98 25 164 

VINYL RADICAL N 45 9 1 36 

VINYLIDENE N 42 32 0 12 

VIOLENCE N 3 4 28 5 

VIRAL DISEASES N 12 11 0 12 

VIRGIN ISLANDS N 14 10 10 20 

VIRGINIA N 278 70 157 255 

VIRGO GALACTIC CLUSTER N 23 653 0 13 

VIRIAL COEFFICIENTS N 8 13 0 3 

VIRIAL THEOREM N 68 484 7 32 

VIRTUAL MEMORY SYSTEMS N 29 26 3 3 

VIRTUAL PROPERTIES N 59 200 4 15 

VIRULENCE N 12 4 10 28 

VIRUSES N 146 80 156 292 

VISCERA N 8 57 1 3 

VISCOELASTIC CYLINDERS N 35 158 2 14 

VISCOELASTIC DAMPING N 65 206 3 16 

VISCOELASTICITY N 1397 2827 112 722 

VISCOMETERS N 109 63 2 42 

VISCOMETRY N 56 76 10 21 

VI SCOPLASTIC ITY N 393 806 13 83 

VISCOPUMPS N 2 7 0 1 

VISCOSITY N 2411 2763 135 1468 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ****** .. TYPE STAR IAA NLN OTHER 

VISCOUNT AIRCRAFT N 11 4 0 7 

VISCOUS DAMPING N 200 648 2 71 

VISCOUS DRAG N 128 306 4 62 

VISCOUS FLOW N 2244 6409 95 931 

VISCOUS FLUIDS N 372 2286 14 172 

VISIBILITY N 1343 917 25 849 

VISIBLE INFRARED SPIN SCAN RADIOMETER N 86 129 1 16 

VISIBLE SPECTRUM N 322 2287 14 286 

VISION N 478 225 146 500 

VISORS N 47 20 0 61 

VISUAL ACCOMMODATION N 36 169 4 19 

VISUAL ACUITY N 404 436 10 160 

VISUAL AIDS N 317 132 90 202 

VISUAL CONTROL N 117 148 3 67 

VISUAL DISCRIMINATION N 338 566 9 107 

VISUAL FIELDS N 170 741 15 57 

VISUAL FLIGHT N 114 144 5 65 

VISUAL FLIGHT RULES N 78 68 0 41 

VISUAL OBSERVATION N 378 1451 22 558 

VISUAL PERCEPTION N 1885 1976 180 937 

VISUAL PHOTOMETRY N 55 554 2 15 

VISUAL PIGMENTS N 10 106 0 6 

VISUAL SIGNALS N 200 214 10 94 

VISUAL STIMULI N 392 2019 13 133 

VISUAL TASKS N 191 1007 4 48 

VITAMINS N 59 63 56 45 

VITERBI DECODERS N 124 359 0 19 

VITON RUBBER (TRADEMARK) N 23 13 0 12 

VITREOUS MATERIALS N 114 129 9 78 

VITRIFICATION N 68 36 3 32 

VJ-101 AIRCRAFT N 5 3 0 1 

VLASOV EQUATIONS N 363 1293 5 71 

VLF EMISSION RECORDERS N 13 276 4 12 

VOCAL CORDS N 15 7 1 3 

VOCODERS N 163 60 4 131 

VOICE N 43 17 9 28 

VOICE COMMUNICATION N 1137 1124 77 1193 

VOICE CONTROL N 70 96 0 27 

VOICE DATA PROCESSING N 332 260 20 151 

VOICE OF AMERICA N 5 2 0 4 

VOID RATIO N 170 158 3 67 

VOIDS N 383 479 8 172 

VOIGT EFFECT N 28 154 1 10 

VOLATILITY N 432 526 12 268 

VOLCANOES N 633 1087 89 363 

VOLCANOLOGY N 694 931 72 372 

VOLT-AMPERE CHARACTERISTICS N 537 10443 13 192 1

VOLTAGE AMPLIFIERS N 76 93 9 61 

VOLTAGE CONTROLLED OSCILLATORS N 36 182 1 34 

VOLTAGE CONVERTERS (ACTO AC) N 27 49 3 25 
NASA COMBINED FILE POSTING STATISTICS 

910117 

"'"'***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

VOLTAGE CONVERTERS (DC TO DC) N 162 397 8 88 

VOLTAGE GENERATORS N 88 144 3 85 

VOLTAGE REGULATORS N 601 637 50 764 

VOLTERRA EQUATIONS N 258 832 23 53 

VOLTMETERS N 212 100 16 173 

VOLUME N 338 290 39 446 

VOLUMETRIC ANALYSIS N 189 216 25 119 

VOLUMETRIC EFFICIENCY N 19 26 0 7 

VOLUMETRIC STRAIN N 21 80 1 12 

VOMITING N 30 44 1 39 

VON KARMAN EQUATION N 101 512 5 28 

VON ZEIPEL METHOD N 15 73 0 1 

VORTEX ADVISORY SYSTEM N 0 2 0 1 

VORTEX ALLEVIATION N 32 22 0 29 

VORTEX AVOIDANCE N 11 5 0 9 

VORTEX BRE~· DOWN N 227 483 1 81 

VORTEX FILAMENTS N 33 141 0 9 

VORTEX FLAPS N 46 42 0 61 

VORTEX GENERATORS N 259 513 2 147 

VORTEX INJECTORS N 17 33 0 7 

VORTEX PRECESSION N 3 3 0 0 

VORTEX RINGS N 145 391 2 31 

VORTEX SHEDDING N 252 664 1 136 

VORTEX SHEETS N 275 731 0 99 

VORTEX STREETS N 71 358 0 22 

VORTICES N 3952 8069 77 1931 1

VORTICITY N 673 2498 14 203 

VORTICITY EQUATIONS N 178 577 0 31 

VORTICITY TRANSPORT HYPOTHESIS N 28 94 1 6 

VOSKHOD MANNED SPACECRAFT N 16 36 1 3 

VOSKHOD 1 SPACECRAFT N 0 3 0 0 

VOSKHOD 2 SPACECRAFT N 8 20 2 0 

VOSTOK SPACECRAFT N 23 44 0 10 

VOSTOK 1 SPACECRAFT N 0 0 0 1 

VOSTOK 2 SPACECRAFT N 1 2 0 0 

VOSTOK 3 SPACECRAFT N 1 3 0 0 

VOSTOK 4 SPACECRAFT N 1 2 0 0 

VOSTOK 5 SPACECRAFT N 0 1 0 0 

VOSTOK 6 SPACECRAFT N 0 1 0 0 

VOTING N 7 7 27 4 

VOWELS N 57 14 0 13 

VOYAGER PROJECT N 382 733 19 259 

VOYAGER 1 SPACECRAFT N 153 490 0 61 

VOYAGER 1977 MISSION N 5 22 0 3 

VOYAGER 2 SPACECRAFT N 166 641 0 71 

VSAT (NETWORK) N 0 34 0 0 

VULCAN AIRCRAFT N 2 6 0 9 

VULCANIZED ELASTOMERS N 65 26 6 70 

VULCANIZING N 41 18 7 66 

VULNERABILITY N 516 68 10 3360 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

VYCOR N 12 4 0 11 

VZ-2 AIRCRAFT N 1 2 0 1 

VZ-8 AIRCRAFT N 0 1 0 2 

WABASH RIVER BASIN (IL-IN-OH) N 18 0 0 2 

WADIS N 2 3 0 2 

WAFERS N 622 447 11 594 

WAGE SURVEYS N 13 7 124 30 

WAKEFULNESS N 69 204 7 31 

WAKES N 960 1507 24 793 

WALES N 11 38 0 7 

WALKING N 98 78 3 30 

WALKING MACHINES N 57 181 5 36 

WALL FLOW N 1126 4709 13 316 

WALL JETS N 159 538 3 43 

WALL PRESSURE N 399 923 8 179 

WALL TEMPERATURE N 495 2507 4 246 

WALLOPS ISLAND N 26 59 3 38 

WALLS N 987 367 37 557 

WALSH FUNCTION N 101 235 12 37 

WANKEL ENGINES N 24 66 7 12 

WAR GAMES N 119 59 8 417 

WARFARE N 341 160 251 1881 

WARHEADS N 58 29 5 1032 

WARM FRONTS N 29 106 0 15 

WARNING N 27 16 2 22 

WARNING SYSTEMS N 1034 720 42 1893 

WARPAGE N 57 192 3 32 

WASHERS N 0 3 0 2 

WASHERS (CLEANERS) N 20 9 2 17 

WASHERS (SPACERS) N 15 24 0 48 

WASHING N 84 52 8 68 

WASHINGTON N 280 134 55 246 

WASP SOUNDING ROCKET N 1 0 0 5 

WASP A LOY N 31 68 1 25 

WASTE DISPOSAL N 2438 733 525 2113 

WASTE ENERGY UTILIZATION N 549 467 56 371 

WASTE HEAT N 93 37 4 49 

WASTE TREATMENT N 453 187 46 340 

WASTE UTILIZATION N 690 736 140 518 

WASTE WATER N 556 227 81 498 

WASTES N 205 11 86 227 

WATER N 3318 3119 355 2608 

WATER BALANCE N 200 200 28 89 

WATER CIRCULATION N 243 377 20 213 

WATER COLOR N 120 156 1 46 

WATER CONSUMPTION N 146 107 14 177 

WATER COOLED REACTORS N 275 45 6 87 

WATER CURRENTS N 211 76 13 140 

WATER DEPRIVATION N 13 16 0 7 

WATER DEPTH N 246 201 4 144 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM *** .. **"' TYPE STAR IAA NLN OTHER 

WATER EROSION N 195 187 5 238 

WATER FLOW N 1038 833 55 736 

WATER HAMMER N 36 24 12 14 

WATER HEATING N 485 412 14 340 

WATER IMMERSION N 61 117 0 26 

WATER INJECTION N 103 99 0 100 

WATER INTAKES N 3 9 0 9 

WATER LANDING N 70 88 2 106 

WATER LOSS N 78 60 0 39 

WATER MANAGEMENT N 842 279 156 680 

WATER MASERS N 27 550 0 2 

WATER MODERATED REACTORS N 107 7 0 43 

WATER POLLUTION N 2629 833 585 2620 

WATER PRESSURE N 98 63 6 67 

WATER QUALITY N 1653 531 248 2025 

WATER RECLAMATION N 360 249 27 236 

WATER RESOURCES N 1600 452 273 1491 

WATER RUNOFF N 343 93 10 213 

WATER SPLITTING N 138 249 0 17 

WATER TABLES N 129 29 5 186 

WATER TAKEOFF AND LANDING AIRCRAFT N 14 15 1 14 

WATER TEMPERATURE N 765 1070 26 486 

WATER TREATMENT N 916 315 232 723 

WATER TUNNEL TESTS N 109 208 0 88 

WATER VAPOR N 1907 4389 38 953 

WATER VEHICLES N 59 58 5 169 

WATER WAVES N 1443 1430 78 961 

WATER WHEELS N 5 0 6 5 

WATERFOWL N 16 12 15 17 

WATERPROOFING N 103 22 9 336 

WATERSHEDS N 580 170 60 390 

WATERWAVE ENERGY N 41 45 14 29 

WATERWAVE ENERGY CONVERSION N 29 140 17 35 

WATERWAVE POWERED MACHINES N 4 32 3 3 

WATERWAYS N 35 6 8 35 

WATTMETERS N 28 27 5 22 

WAVE AMPLIFICATION N 117 685 3 49 

WAVE ATTENUATION N 457 1945 11 269 

WAVE DEGRADATION N 34 72 0 12 

WAVE DIFFRACTION N 529 4343 46 212 

WAVE DISPERSION N 625 4272 21 215 

WAVE DRAG N 96 170 0 50 

WAVE EQUATIONS N 1083 4575 141 342 

WAVE EXCITATION N 232 2574 6 106 

WAVE FRONT DEFORMATION N 81 582 1 45 

WAVE FRONT RECONSTRUCTION N 112 1710 10 53 

WAVE FRONTS N 389 1651 17 312 

WAVE FUNCTIONS N 1538 2090 77 557 

WAVE GENERATION N 285 1509 17 176 

WAVE INCIDENCE CONTROL N 10 23 0 3 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

WAVE INTERACTION N 862 4483 52 391 

WAVE PACKETS N 90 884 5 48 

WAVE PROPAGATION N 6242 11881 514 3153 2

WAVE REFLECTION N 702 3304 19 264 

WAVE RESISTANCE N 38 125 3 52 

WAVE SCATTERING N 619 1945 43 281 

WAVEFORMS N 1223 3124 47 831 

WAVEGUIDE ANTENNAS N 155 948 4 112 

WAVEGUIDE FILTERS N 55 335 3 34 

WAVEGUIDE LASERS N 52 535 1 41 

WAVEGUIDE TUNERS N 18 86 0 25 

WAVEGUIDE WINDOWS N 60 112 2 84 

WAVEGUIDES N 1813 5292 157 1319 

WAVELENGTH DIVISION MULTIPLEXING N 26 114 0 6 

WAVELENGTHS N 1382 3390 51 883 

WAVERIDERS N 9 50 0 1 

WAVES N 117 54 132 125 

WAXES N 50 43 13 53 

WEAK ENERGY INTERACTIONS N 85 147 7 39 

WEAK INTERACTIONS (FIELD THEORY) N 122 178 10 38 

WEAPON SYSTEM MANAGEMENT N 46 133 5 155 

WEAPON SYSTEM 107A-1 N 0 0 0 11 

WEAPON SYSTEM 107A-2 N 0 0 0 9 

WEAPON SYSTEM 133A N 0 0 0 23 

WEAPON SYSTEM 133B N 0 0 0 53 

WEAPON SYSTEM 315A N 0 0 0 2 

WEAPON SYSTEMS N 1317 1666 132 5913 

WEAPONS N 213 39 72 1185 

WEAPONS DELIVERY N 107 240 1 469 

WEAPONS DEVELOPMENT N 105 147 20 760 

WEAPONS INDUSTRY N 45 18 9 64 

WEAR N 1140 697 123 749 

WEAR INHIBITORS N 205 212 8 128 

WEAR RESISTANCE N 299 527 3 54 

WEAR TESTS N 707 1282 19 442 

WEATHER N 1612 383 213 1169 

WEATHER DATA RECORDERS N 114 100 5 43 

WEATHER FORECASTING N 3606 1659 167 1845 

WEATHER MODIFICATION N 755 353 80 326 

WEATHER RECONNAISSANCE AIRCRAFT N 57 16 1 34 

WEATHER STATIONS N 1155 463 35 515 

WEATHERING N 393 234 32 272 

WEATHERPROOFING N 44 11 5 61 

WEAVING N 62 95 2 191 

WEBBING N 14 18 0 19 

WEBER TEST N 1 4 0 2 

WEBER-FECHNER LAW N 2 11 1 5 

WEBS N 2 14 0 5 

WEBS (SHEETS) N 91 33 1 44 

WEBS (SUPPORTS) N 80 55 2 40 
NASA COMBINED FILE POSTING STATISTICS 

910117 

**•*'*** SUBJECT TERM ******• TYPE STAR IAA NLN OTHER 

WEDGE FLOW N 121 685 1 49 

WEDGES N 302 676 5 150 

WEIBEL INSTABILITY N 4 8 0 5 

INEIBULL DENSITY FUNCTIONS N 409 910 6 130 

WEIERSTRASS FUNCTIONS N 24 108 9 9 

WEIGHT N 48 24 2 58 

WEIGHT (MASS) N 730 274 45 1340 

WEIGHT ANALYSIS N 261 799 5 610 

WEIGHT INDICATORS N 79 84 2 62 

WEIGHT MEASUREMENT N 108 135 47 79 

INE I GHT REDUCT! ON N 708 2509 8 704 

WEIGHTING FUNCTIONS N 871 1882 11 234 

WEIGHTLESS FLUIDS N 8 30 0 10 

WEIGHTLESSNESS N 2350 1939 97 1968 

WEIGHTLESSNESS SIMULATION N 409 495 6 131 

WELD STRENGTH N 473 749 40 388 

WELD TESTS N 374 634 20 298 

INELDABILITY N 262 295 18 238 

WELDED JOINTS N 1151 1441 90 925 

WELDED STRUCTURES N 390 359 57 450 

WELDING N 789 566 332 1305 

WELDING MACHINES N 98 251 13 111 

WELLS N 542 103 17 599 

WENTZEL-KRAMER-BRILLOUIN METHOD N 56 521 2 11 

INESER AIRCRAFT N 1 0 0 0 

WEST COMET N 5 37 0 0 

WEST FORD PROJECT N 1 0 0 0 

WEST GERMANY N 1478 1354 213 939 

WEST INDIES N 59 2 6 19 

WEST VIRGINIA N 86 17 10 99 

WESTAR SATELLITES N 4 50 0 37 

WESTERN HEMISPHERE N 1 15 2 5 

WESTLAND AIRCRAFT N 11 37 1 1 

WESTLAND GROUND EFFECT MACHINES N 1 1 0 0 

WESTLAND WHIRLWIND HELICOPTER N 5 2 0 5 

\NET CELLS N 38 8 3 57 

WET SPINNING N 4 3 0 5 

WETLANDS N 354 195 29 175 

INETTABILITY N 132 150 7 68 

WETTING N 279 295 7 198 

WHALES N 17 5 10 16 

WHARVES N 12 0 5 28 

WHEAT N 562 281 13 94 

WHEATSTONE BRIDGES N 47 97 2 37 

WHEEL BRAKES N 44 50 1 54 

WHEELCHAIRS N 8 3 0 7 

WHEELS N 143 96 6 129 

WHIP ANTENNAS N 17 17 0 46 

WHIPLASH INJURIES N 18 10 2 4 

WHIRL TOWERS N 9 15 0 1 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

WHISKER COMPOSITES N 172 604 3 192 

WHISKERS (CRYSTALS) N 142 256 11 161 

WHISPERING GALLERY MODES N 22 83 0 2 

WHISTLER RECORDERS N 9 47 0 2 

WHISTLERS N 275 1773 6 101 

WHITE DWARF STARS N 268 2806 24 99 

WHITE HOLES (ASTRONOMY) N 1 38 2 1 

WHITE LIGHT HOLOGRAPHY N 27 86 2 5 

WHITE NOISE N 744 2298 11 247 

WHITEOUT N 5 0 0 0 

WHITHAM RULE N 15 49 0 7 

WHITTAKER FUNCTIONS N 13 40 1 3 

WICKS N 108 174 1 44 

WIDE ANGLE LENSES N 85 141 1 73 

WIDEBAND COMMUNICATION N 200 891 13 175 

WIDMANSTATTEN STRUCTURE N 11 119 0 5 

WIDTH N 108 113 0 79 

WIENER FILTERING N 123 395 13 43 

WIENER HOPF EQUATIONS N 119 582 9 26 

WIGGLER MAGNETS N 216 497 0 17 

WIGNER COEFFICIENT N 61 70 3 23 

WILDERNESS N 35 24 10 28 

WILDLIFE N 202 65 86 184 

WILDLIFE RADIOLOCATION N 38 17 3 11 

WILLISTON BASIN (NORTH AMERICA) N 0 1 0 2 

WINCHES N 34 21 3 64 

WIND (METEOROLOGY) N 3099 803 124 1985 

WIND DIRECTION N 1098 1269 6 552 

WIND EFFECTS N 1273 2597 50 595 

WINO EROSION N 63 62 1 36 

WIND MEASUREMENT N 1182 1819 16 518 

WIND PRESSURE N 312 165 36 182 

WIND PROFILES N 1356 2533 10 717 

WIND RIVER RANGE (WY) N 13 4 0 1 

WIND SHEAR N 915 1473 11 340 

WIND TUNNEL APPARATUS N 496 598 12 238 

WIND TUNNEL CALIBRATION N 201 185 7 105 

WIND TUNNEL DRIVES N 100 66 1 40 

WIND TUNNEL MODELS N 2309 1635 18 2834 

WIND TUNNEL NOZZLES N 102 125 2 62 

WIND TUNNEL STABILITY TESTS N 754 368 11 1161 

WIND TUNNEL TESTS N 5825 6944 75 7322 2

WIND TUNNEL WALLS N 560 519 7 266 

WIND TUNNELS N 1010 740 114 1012 

WIND TURBINES N 770 389 11 313 

WIND VANES N 46 53 2 11 

WIND VARIATIONS N 360 717 6 124 

WIND VELOCITY N 2658 3492 24 1393 

WIND VELOCITY MEASUREMENT N 605 1512 5 457 

WINDING N 152 119 12 204 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM "'****** TYPE STAR IAA NLN OTHER 

WINDMILLS (WINDPOWEREO MACHINES) N 332 394 52 195 

WINDOWS N 45 92 4 39 

WINDOWS (APERTURES) N 409 387 17 362 

WINDOWS (INTERVALS) N 90 122 4 83 

WINOPOWER UTILIZATION N 1157 817 142 599 

WINOPOWEREO GENERATORS N 767 800 53 341 

WINDPOWEREO PUMPS N 43 25 5 23 

WINDS ALOFT N 117 310 4 50 

WINDSHIELDS N 211 136 2 214 

WINES N 3 2 6 2 

WING CAMBER N 61 112 1 70 

WING FLAPS N 183 262 4 140 

WING FLOW METHOD TESTS N 57 214 1 61 

WING LOADING N 396 816 13 287 

WING NACELLE CONFIGURATIONS N 58 82 0 55 

WING OSCILLATIONS N 316 810 2 140 

WING PANELS N 155 259 1 172 

WING PLANFORMS N 351 545 7 220 

WING PROFILES N 440 1253 18 299 

WING ROOTS N 62 70 0 39 

WING SLOTS N 76 46 2 82 

WING SPAN N 108 249 2 69 

WING TANKS N 49 33 0 75 

WING TIP VORTICES N 89 205 1 59 

WING TIPS N 181 238 3 170 

WING-FUSELAGE STORES N 74 67 2 70 

WINGED VEHICLES N 31 104 1 25 

WINGLETS N 90 91 0 61 

WINGS N 1220 1098 108 1741 

WINTER N 885 2227 13 351 

WIRE N 834 708 41 704 

WIRE BRIDGE CIRCUITS N 35 20 3 12 

WIRE CLOTH N 69 81 0 67 

WIRE GRID LENSES N 20 46 0 11 

WIRE WINDING N 98 145 4 147 

WIRELESS COMMUNICATION N 45 38 8 54 

WIRING N 203 123 71 260 

WISCONSIN N 152 69 11 128 

WISWESSER NOTATIONS N 4 0 1 1 

WDLF-RAYET STARS N 99 1082 3 19 

WOLVES N 1 2 1 0 

WOOD N 360 162 145 367 

WOODEN STRUCTURES N 33 16 26 43 

WOOL N 25 25 5 25 

WORD PROCESSING N 99 32 63 34 

WORDS (LANGUAGE) N 455 126 266 228 

WORK N 143 72 221 508 

WORK CAPACITY N 321 1006 31 134 

WORK FUNCTIONS N 351 860 14 250 

WORK HARDENING N 140 799 4 54 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

WORK SOFTENING N 4 25 0 1 

WORK-REST CYCLE N 161 413 8 76 

WORKING FLUIDS N 453 1512 14 188 

WORKLOADS (PSYCHOPHYSIOLOGY) N 814 894 47 306 

WORKSTATIONS N 303 203 8 121 

WORLD DATA CENTERS N 175 36 9 69 

WORLD METEOROLOGICAL ORGANIZATION N 151 15 53 22 

WORMS N 27 17 8 23 

WOUND HEALING N 25 15 10 48 

WRANGELL MOUNTAINS (AK) N 9 2 1 0 

WRAP N 2 7 0 4 

WRECKAGE N 24 8 2 8 

WRENCHES N 24 5 1 55 

WRINKLING N 25 72 1 16 

WRIST N 31 40 1 18 

WROUGHT ALLOYS N 48 398 11 26 

WURTZITE N 15 55 0 4 

WYOMING N 238 70 67 172 

X MESONS N 1 0 0 0 

X RAY ABSORPTION N 217 254 13 62 

X RAY ANALYSIS N 1370 2633 130 681 

X RAY APPARATUS N 141 252 18 148 

X RAY ASTRONOMY N 806 3655 61 557 

X RAY ASTROPHYSICS FACILITY N 41 100 0 49 

X RAY BINARIES N 177 1134 3 17 

X RAY DENSITY MEASUREMENT N 87 192 1 27 

X RAY DIFFRACTION N 2210 3508 138 1087 

X RAY FLUORESCENCE N 384 275 17 213 

X RAY IMAGERY N 233 670 12 112 

X RAY INSPECTION N 206 418 12 182 

X RAY IRRADIATION N 273 441 4 142 

X RAY LASERS N 175 467 4 65 

X RAY SCATTERING N 276 373 23 102 

X RAY SOURCES N 852 5495 27 406 

X RAY SPECTRA N 814 2668 12 260 

X RAY SPECTROSCOPY N 953 1511 97 415 

X RAY STARS N 36 1147 4 24 

X RAY STRESS ANALYSIS N 38 118 0 24 

X RAY STRESS MEASUREMENT N 29 98 3 11 

X RAY TELESCOPES N 269 761 7 159 

X RAY TIMING EXPLORER N 3 4 0 9 

X RAY TUBES N 17 21 0 10 

X RAYS N 1799 1486 200 1422 

X WING ROTORS N 22 48 0 18 

X-Y PLOTTERS N 66 118 3 29 

X-1 AIRCRAFT N 1 8 2 2 

X-13 AIRCRAFT N 0 2 0 1 

X-14 AIRCRAFT N 6 7 0 5 

X-15 AIRCRAFT N 60 50 13 119 

X-17 REENTRY VEHICLE N 0 1 0 2 
NASA COMBINED FILE POSTING STATISTICS 

910117 

'*'****** SUBJECT TERM ***-"'*** TYPE STAR IAA NLN OTHER 

X-19 AIRCRAFT N 0 2 0 4 

X-2 AIRCRAFT N 1 2 0 1 

X-20 AIRCRAFT N 6 9 1 165 

X-21 AIRCRAFT N 0 1 0 3 

X-21A AIRCRAFT N 0 0 1 3 

X-22 AIRCRAFT N 16 13 0 11 

X-22A AIRCRAFT N 4 16 0 14 

X-24 AIRCRAFT N 14 13 1 50 

X-248 ENGINE N 6 0 0 4 

X-254 ENGINE N 0 1 0 4 

X-258 ENGINES N 0 2 0 3 

X-258-B1 ENGINE N 0 0 0 2 

X-259 ENGINE N 0 1 0 2 

X-29 AIRCRAFT N 61 131 1 47 

X-3 AIRCRAFT N 1 1 0 0 

X-30 VEHICLE N 5 22 0 0 

X-405 ENGINE N 1 0 0 0 

X-5 AIRCRAFT N 2 3 0 0 

XANTHIC ACIDS N 2 1 1 1 

XANTHINES N 7 15 0 3 

XC-142 AIRCRAFT N 10 6 0 21 

XENON N 657 1127 8 306 

XENON CHLORIDE LASERS N 50 269 0 7 

XENON COMPOUNDS N 31 151 0 22 

XENON FLUORIDE LASERS N 43 273 1 36 

XENON ISOTOPES N 70 239 1 28 

XENON LAMPS N 127 193 1 141 

XENON 129 N 7 32 0 2 

XENON 133 N 22 39 0 9 

XENON 135 N 11 0 0 2 

XEROGRAPHY N 9 14 12 19 

XH-51 HELICOPTER N 9 6 0 6 

XI HYPERONS N 6 0 0 1 

XLR-99 ENGINE N 0 1 0 0 

XM-33 ENGINE N 0 1 0 2 

XV-11A AIRCRAFT N 0 1 0 0 

XV-15 AIRCRAFT N 40 82 0 38 

XV-3 AIRCRAFT N 1 3 0 3 

XV-4 AIRCRAFT N 2 9 0 6 

XV-5 AIRCRAFT N 7 4 0 12 

XV-SA AIRCRAFT N 1 0 0 2 

XV-9A AIRCRAFT N 0 1 1 0 

XYLENE N 48 35 1 42 

XYLOSE N 6 4 0 6 

YAG LASERS N 492 2121 4 272 

VAGI ANTENNAS N 60 146 2 26 

YAK 40 AIRCRAFT N 7 16 2 7 

YANG-MILLS FIELDS N 12 26 0 11 

YANG-MILLS THEORY N 30 46 1 37 

YARNS N 64 89 4 177 
NASA COMBINED FILE POSTING STATISTICS 

910117 

******* SUBJECT TERM **"'  TYPE STAR IAA NLN OTHER 

YAW N 570 670 1 612 

YAWING MOMENTS N 170 209 1 113 

YC-14 AIRCRAFT N 11 58 0 16 

YEAST N 78 68 16 71 

YELLOWSTONE NATIONAL PARK (ID-MT-WY) N 26 10 11 13 

YEMEN N 13 7 1 5 

YF-12 AIRCRAFT N 46 37 0 64 

YF-16 AIRCRAFT N 23 24 0 32 

YIELD N 436 131 7 381 

YIELD POINT N 265 1225 6 122 

YIELD STRENGTH N 905 2104 34 551 

YLF LASERS N 0 4 0 0 

YLR-91-AJ-1 ENGINE N 0 0 0 2 

YO-YO DEVICES N 14 24 0 8 

YOKES N 10 21 0 13 

YOUNG-HELMHOLTZ THEORY N 3 1 0 0 

YOUTH N 7 23 22 12 

YS-11 AIRCRAFT N 1 4 0 1 

YTTERBIUM N 85 89 0 46 

YTTERBIUM COMPOUNDS N 27 38 0 7 

YTTERBIUM ISOTOPES N 13 4 0 2 

YTTRIUM N 267 193 10 113 

YTTRIUM ALLOYS N 72 187 1 25 

YTTRIUM COMPOUNDS N 215 491 1 74 

YTTRIUM ISOTOPES N 15 10 0 5 

YTTRIUM OXIDES N 517 1809 0 101 

YTTRIUM-ALUMINUM GARNET N 89 282 1 149 

YTTRIUM-IRON GARNET N 124 452 2 129 

YUGOSLAVIA N 49 31 9 37 

YUKAWA POTENTIAL N 40 21 1 6 

YUKON TERRITORY N 1 2 0 1 

Z-37 AIRCRAFT N 0 4 0 0 

ZAIRE N 15 17 3 10 

ZAMBIA N 8 4 5 1 

ZEEMAN EFFECT N 256 972 15 104 

ZENER EFFECT N 29 45 3 24 

ZENITH N 155 818 2 36 

ZEOLITES N 142 46 17 83 

ZERO ANGLE OF ATTACK N 41 207 0 20 

ZERO FORCE CURVES N 5 29 0 1 

ZERO LIFT N 41 23 0 28 

ZERO POINT ENERGY N 4 19 0 2 

ZERO POWER REACTOR 2 N 2 0 0 0 

ZERO POWER REACTOR 3 N 11 0 0 0 

ZERO POWER REACTOR 6 N 6 0 0 0 

ZERO POWER REACTOR 9 N 4 0 0 0 

ZERO POWER REACTORS N 88 0 1 11 

ZERO SOUND N 8 3 0 2 

ZETA AURIGAE STAR N 7 7 0 1 

ZETA PINCH N 93 147 1 14 
NASA COMBINED FILE POSTING STATISTICS 

910117 

** ***** SUBJECT TERM ******* TYPE STAR IAA NLN OTHER 

ZETA THERMONUCLEAR REACTOR N 8 22 0 5 

ZIEGLER CATALYST N 9 2 1 3 

ZIMBABWE N 9 10 5 6 

ZINC N 832 642 44 558 

ZINC ALLOYS N 315 841 12 159 

ZINC ANTIMONIDE$ N 0 5 0 1 

ZINC CHLORIDES N 23 19 1 15 

ZINC COATINGS N 109 32 6 76 

ZINC COMPOUNDS N 292 205 7 220 

ZINC FLUORIDES N 3 8 0 4 

ZINC ISOTOPES N 26 11 0 5 

ZINC OXIDES N 294 283 7 202 

ZINC SELENIDES N 185 293 0 120 

ZINC SULFIDES N 208 333 5 135 

ZINC TELLURIDES N 60 127 0 29 

ZINC TUNGSTATE$ N 0 9 0 1 

ZINC-BROMIDE BATTERIES N 35 24 0 3 

ZINC-CHLORINE BATTERIES N 14 15 0 6 

ZINC-OXYGEN BATTERIES N 32 17 2 21 

ZINCBLENDE N 29 53 1 11 

ZIPPERS N 4 1 0 9 

ZIRCALOY 2 (TRADEMARK) N 72 19 1 55 

ZIRCALOYS (TRADEMARK) N 199 25 1 74 

ZIRCONATES N 83 70 0 40 

ZIRCONIUM N 582 505 22 405 

ZIRCONIUM ALLOYS N 445 1239 12 278 

ZIRCONIUM CARBIDES N 69 268 2 68 

ZIRCONIUM COMPOUNDS N 187 211 4 153 

ZIRCONIUM HYDRIDES N 53 51 0 86 

ZIRCONIUM IODIDES N 4 6 0 3 

ZIRCONIUM ISOTOPES N 34 21 0 15 

ZIRCONIUM NITRIDES N 11 86 0 5 

ZIRCONIUM OXIDES N 539 1175 2 287 

ZIRCONIUM TITANATE$ N 13 17 0 1 

ZIRCONIUM 95 N 7 4 0 5 

ZODIAC N 0 3 2 5 

ZODIACAL DUST N 43 130 1 15 

ZODIACAL LIGHT N 123 425 4 78 

ZONAL FL0\11 (METEOROLOGY) N 157 824 0 23 

ZONAL HARMONICS N 91 301 0 31 

ZOND SPACE PROBES N 13 64 1 3 

ZOND 1 SPACE PROBE N 0 2 0 1 

ZOND 2 SPACE PROBE N 0 2 0 1 

ZOND 3 SPACE PROBE N 6 26 0 2 

ZOND 4 SPACE PROBE N 1 1 0 1 

ZOND 5 SPACE PROBE N 16 20 0 0 

ZOND 6 SPACE PROBE N 9 13 0 1 

ZOND 7 SPACE PROBE N 8 9 0 0 

ZOND 8 SPACE PROBE N 0 9 0 1 

ZONE MELTING N 182 289 8 137 
910117 

NASA 

******* SUBJECT TERM ******* 

ZOOM 

ZOOLOGY 

LENSES 

ZUNI 

ZOOPLANKTON 

ROCKET VEHICLE 

TOTAL NUMBER OF TERMS 

TOTAL STAR POSTINGS 

TOTAL IAA POSTINGS 

TOTAL NLN POSTINGS 

TOTAL OTHER POSTINGS 

TOTAL POSTINGS 

COMBINED FILE POSTING 

TYPE 

N 

N 

N 

N 

17304 

9113224 

5108962 

595234 

3930663 

18748083 

STAR 

7 

5 

56 

0 

STATISTICS 

IAA 

8 

20 

3 

9 

NLN 

112 

0 

1 

0 

OTHER 

11 

6 

2 

34