# Library of Congress Classification:Class T -- Technology

Class T: Technology is a classification used by the Library of Congress Classification system. This page outlines the subclasses of Class T.

## T - Technology (general)

    10.5-11.9...................................Communication of technical information
    11.95-12.5.................................Industrial directories
       55-55.3............................................Industrial safety. Industrial accident prevention
    55.4-60.8...................................Industrial engineering. Management engineering
       57-57.97..........................................Applied mathematics. Quantitative methods
          57.6-57.97.............................................Operations research. Systems analysis
       58.4................................................Managerial control systems
       58.5-58.64.......................................Information technology
       58.6-58.62.......................................Management information systems
       58.7-58.8.........................................Production capacity. Manufacturing capacity
       59-59.2............................................Standardization
       59.5................................................Automation
       59.7-59.77.......................................Human engineering in industry. Man-machine systems
       60-60.8............................................Work measurement. Methods engineering
    61-173.......................................Technical Education. Technical schools
    173.2-174.5...............................Technological change
    175-178.....................................Industrial research. Research and development
    201-342.....................................Patents. Trademarks
    351-385.....................................Mechanical drawing. Engineering graphics
    391-995.....................................Exhibitions. Trade shows. World Fairs.

## TA - Engineering (general). Civil engineering

    164..........................................Bioengineering
    165..........................................Engineering instruments, meters, etc. Industrial instrumentation
    166-167...................................Human engineering
    168..........................................Systems engineering
    170-171...................................Environmental engineering
    174..........................................Engineering design
    177.4-185................................Engineering economy
    190-194...................................Management of engineering works
    197-198...................................Engineering meteorology
    213-215...................................Engineering machinery, tools, and implements
    329-348...................................Engineering mathematics. Engineering analysis
    349-359...................................Mechanics of engineering. Applied mechanics
    365-367...................................Acoustics in engineering. Acoustical engineering
    401-492...................................Materials of engineering and construction. Mechanics of materials
    495..........................................Disasters and engineering
    501-625...................................Surveying
    630-695...................................Structural engineering (General)
    703-712...................................Engineering geology. Rock mechanics. Soil mechanics. Underground construction
    715-787...................................Earthwork. Foundations
    800-820...................................Tunneling. Tunnels
    1001-1280...............................Transportation engineering
    1501-1820...............................Applied optics. Photonics
    2001-2040...............................Plasma engineering. Applied plasma dynamics

## TC - Hydraulic engineering. Ocean engineering

    1-978.................................Hydraulic engineering
       160-181...................................Technical hydraulics
       183-201...................................General preliminary operations. Dredging. Submarine building
       203-380...................................Harbors and coast protective works. Coastal engineering. Lighthouses
       401-506...................................River, lake, and water-supply engineering (General)
       530-537...................................River protective works. Regulation. Flood control
       540-558...................................Dams. Barrages
       601-791...................................Canals and inland navigation. Waterways
       801-978...................................Irrigation engineering. Reclamation of wasteland. Drainage
    1501-1800.........................Ocean engineering

## TD - Environmental technology. Sanitary engineering

    159-168...................................Municipal engineering
    169-171.8................................Environmental protection
    172-193.5................................Environmental pollution
    194-195...................................Environmental effects of industries and plants
    201-500...................................Water supply for domestic and industrial purposes
       419-428.........................................Water pollution
       429.5-480.7..................................Water purification. Water treatment and conditioning. Saline water conversion
       481-493.........................................Water distribution systems
    511-780...................................Sewage collection and disposal systems. Sewerage
    783-812.5................................Municipal refuse. Solid wastes
    813-870...................................Street cleaning. Litter and its removal
    878-894...................................Special types of environment. Including soil pollution, air pollution, noise pollution
    895-899...................................Industrial and factory sanitation
       896-899.........................................Industrial and factory wastes
    920-934...................................Rural and farm sanitary engineering
    940-949...................................Low temperature sanitary engineering
    1020-1066...............................Hazardous substances and their disposal

## TE - Highway engineering. Roads and pavements

    175-176.5................................Highway design. Interchanges and intersections
    177-178.8................................Roadside development. Landscaping
    200-205...................................Materials for roadmaking
    206-209.5................................Location engineering
    210-228.3................................Construction details. Including foundations, maintenance, equipment
    250-278.8................................Pavements and paved roads
    279..........................................Streets
    279.5-298................................Pedestrian facilities
       280-295.........................................Sidewalks. Footpaths. Flagging
       298................................................Curbs. Curbstones

## TF - Railroad engineering and operation

    200-320...................................Railway construction
    340-499...................................Railway equipment and supplies
    501-668...................................Railway operation and management
    670-851...................................Local and light railways
       840-851.........................................Elevated railways and subways
    855-1127.................................Electric railways
    1300-1620................................High speed ground transportation

## TG - Bridge engineering

    1-470................................Bridge engineering

## TH - Building construction

    845-895...................................Architectural engineering. Structural engineering of buildings
    900-915...................................Construction equipment in building
    1000-1725...............................Systems of building construction. Including fireproof construction, concrete construction
    2025-3000...............................Details in building design and construction. Including walls, roofs
    3301-3411...............................Maintenance and repair
    4021-4977...............................Buildings: Construction with reference to use. Including public buildings, dwellings
    5011-5701...............................Construction by phase of the work (Building trades)
    6014-6081...............................Environmental engineering of buildings. Sanitary engineering of buildings
    6101-6887...............................Plumbing and pipefitting
    7005-7699...............................Heating and ventilation. Air conditioning
    7700-7975...............................Illumination. Lighting
    8001-8581...............................Decoration and decorative furnishings
    9025-9745...............................Protection of buildings. Including protection from dampness, fire, burglary

## TJ - Mechanical engineering and machinery

    163.13-163.25..........................Power resources
    163.26-163.5............................Energy conservation
    170-179...................................Mechanics applied to machinery. Dynamics
    181-210...................................Mechanical movements
    210.2-211.47............................Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General)
    212-225...................................Control engineering systems. Automatic machinery (General)
    227-240...................................Machine design and drawing
    241-254.7................................Machine construction (General)
    255-265...................................Heat engines
    266-267.5................................Turbines. Turbomachines (General)
    268-740...................................Steam engineering
       603-695.........................................Locomotives
    751-805...................................Miscellaneous motors and engines. Including gas, gasoline, diesel engines
    807-830...................................Renewable energy sources
    836-927...................................Hydraulic machinery
    940-940.5................................Vacuum technology
    950-1030..................................Pneumatic machinery
    1040-1119................................Machinery exclusive of prime movers
    1125-1345................................Machine shops and machine shop practice
    1350-1418................................Hoisting and conveying machinery
    1425-1475................................Lifting and pressing machinery
    1480-1496................................Agricultural machinery. Farm machinery
    1501-1519................................Sewing machines

## TK - Electrical engineering. Electronics. Nuclear engineering

    301-399...................................Electric meters
    452-454.4................................Electric apparatus and materials. Electric circuits. Electric networks
    1001-1841...............................Production of electric energy or power. Powerplants. Central stations
    2000-2891...............................Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
    2896-2985...............................Production of electricity by direct energy conversion
    3001-3521...............................Distribution or transmission of electric power
    4001-4102...............................Applications of electric power
    4125-4399...............................Electric lighting
    4601-4661...............................Electric heating
    5101-6720...............................Telecommunication. Including telegraphy, telephone, radio, radar, television
    7800-8360...............................Electronics
       7885-7895.....................................Computer engineering. Computer hardware
       8300-8360.....................................Photoelectronic devices (General)
    9001-9401...............................Nuclear engineering. Atomic power
    9900-9971...............................Electricity for amateurs. Amateur constructors' manuals

## TL - Motor vehicles. Aeronautics. Astronautics

    1-484.......................................Motor vehicles. Cycles
    500-777...................................Aeronautics. Aeronautical engineering
    780-785.8................................Rocket propulsion. Rockets
    787-4050.................................Astronautics. Space travel

## TN - Mining engineering. Metallurgy

    263-271...................................Mineral deposits. Metallic ore deposits. Prospecting
    275-325...................................Practical mining operations. Safety measures
    331-347...................................Mine transportation, haulage and hoisting. Mining machinery
    400-580...................................Ore deposits and mining of particular metals
    600-799...................................Metallurgy
    799.5-948................................Nonmetallic minerals
    950-997...................................Building and ornamental stones

## TP - Chemical technology

    155-156...................................Chemical engineering
    200-248...................................Chemicals: Manufacture, use, etc.
    248.13-248.65.........................Biotechnology
    250-261...................................Industrial electrochemistry
    267.5-301................................Explosives and pyrotechnics
    315-360...................................Fuel
    368-456...................................Food processing and manufacture
    480-498...................................Low temperature engineering. Cryogenic engineering. Refrigeration
    500-660...................................Fermentation industries. Beverages. Alcohol
    670-699...................................Oils, fats, and waxes
       690-692.5......................................Petroleum refining. Petroleum products
    700-746...................................Illuminating industries (Nonelectric)
    751-762...................................Gas industry
    785-869...................................Clay industries. Ceramics. Glass
    875-888...................................Cement industries
    890-933...................................Textile bleaching, dyeing, printing, etc.
    934-945...................................Paints, pigments, varnishes, etc.
    1080-1185...............................Polymers and polymer manufacture

## TR - Photography

    250-265...................................Cameras
    287-500...................................Photographic processing. Darkroom technique
    504-508...................................Transparencies. Diapositives
    510-545...................................Color photography
    550-581...................................Studio and laboratory
    590-620...................................Lighting
    624-835...................................Applied photography. Including artistic, commercial, medical photography, photocopying processes
    845-899...................................Cinematography. Motion pictures
    925-1050.................................Photomechanical processes

## TS - Manufactures

    155-194...................................Production management. Operations management
    195-198.8................................Packaging
    200-770...................................Metal manufactures. Metalworking
    780-788...................................Stonework
    800-937...................................Wood technology. Lumber
       840-915.........................................Wood products. Furniture
       920-937.........................................Chemical processing of wood
    940-1047..................................Leather industries. Tanning
    1060-1070................................Furs
    1080-1268................................Paper manufacture and trade
    1300-1865................................Textile industries
    1870-1935................................Rubber industry
    1950-1982................................Animal products
    2120-2159................................Cereals and grain. Milling industry
    2220-2283................................Tobacco industry
    2284-2288................................Animal feeds and feed mills. Pet food industry

## TT - Handicrafts. Arts and crafts

    161-170.7................................Manual training. School shops
    174-176...................................Articles for children
    180-200...................................Woodworking. Furniture making. Upholstering
    201-203...................................Lathework. Turning
    205-267...................................Metalworking
    300-382.8................................Painting. Wood finishing
    387-410...................................Soft home furnishings
    490-695...................................Clothing manufacture. Dressmaking. Tailoring
    697-927...................................Home arts. Homecrafts. Including sewing, embroidery, decorative crafts
    950-979...................................Hairdressing. Beauty culture. Barbers' work
    980-999...................................Laundry work

## TX - Home economics

    301-339...................................The house. Including arrangement, care, servants
    341-641...................................Nutrition. Foods and food supply
    642-840...................................Cooking
    851-885...................................Dining-room service
    901-946.5................................Hospitality industry. Hotels, clubs, restaurants, etc. Food service
    950-953...................................Taverns, barrooms, saloons
    955-985...................................Building operation and housekeeping
    1100-1105...............................Mobile home living
    1110........................................Recreational vehicle living