# Library of Congress Classification:Class Q -- Science

Class Q: Science is a classification used by the Library of Congress Classification system. This article outlines the subclasses of Class Q.

## Q - Science (General)

    1-390.......Science (General)
       1-295......General
       300-390....Cybernetics
          350-390...Information theory

## QA - Mathematics

    1-939..............Mathematics
       1-43..............General
       47-59.............Tables
       71-90.............Instruments and machines
          75-76.95.........Calculating machines
             75.5-76.95......Electronic computers. Computer science
                76.73.A-Z......Individual languages A-Z
                   76.73.A12.....ABAP
                   76.73.A24.....ALGOL
                   76.73.A27.....APL
                   76.73.A35.....Ada
                   76.73.A67.....AppleScript
                   76.73.A8.......Assembly languages. Assemblers
                   76.73.A84.....AutoLISP
                   76.73.A95.....AWK
                   76.73.B155...B
                   76.73.B3......BASIC
                   76.73.B78....BSV 753
                   76.73.C15.....C
                   76.73.C153....C++
                   76.73.C154....C#
                   76.73.C25.....COBOL
                   76.73.C56.....Clipper
                   76.73.C58.....CoffeeScript
                   76.73.C75.....CSP
                   76.73.C87.....Curl
                   76.73.D138...D
                   76.73.D14.....D*
                   76.73.D23.....Dart
                   76.73.D25.....DRL
                   76.73.D95.....Dylan
                   76.73.E27.....EasyLanguage
                   76.73.E38.....ELAN
                   76.73.E75.....ERLANG
                   76.73.F16.....F
                   76.73.F23.....FOCUS
                   76.73.F25.....FORTRAN
                   76.73.F74.....FRED
                   76.73.G25....GW-BASIC
                   76.73.G63....Go
                   76.73.H37.....Haskell
                   76.73.H6.......HP-GL/2
                   76.73.H96.....HyperTalk
                   76.73.I22.......INFORMIX-4GL
                   76.73.J2........J#
                   76.73.J38.....Java
                   76.73.J39.....JavaScript
                   76.73.J63.....Job Control Language
                   76.73.J7.......JR
                   76.73.K63.....Kodu
                   76.73.K67.....KornShell
                   76.73.L23......LISP
                   76.73.L62......LogiQL
                   76.73.L63......LOGO
                   76.73.L66.......LotusScript
                   76.73.L82.......Lua
                   76.73.M15......M
                   76.73.M29......Mathematica
                   76.73.M35......Maude
                   76.73.M39......MDX
                   76.73.M53.....Microsoft Visual Basic
                   76.73.M6.......ML
                   MySQL see QA76.73.S67
                   76.73.N39.....NCL
                   76.73.O115...Objective-C
                   76.73.O213...OpenCL
                   76.73.P224....PHP
                   76.73.P25.....PL/1
                   76.73.P32......packetC
                   76.73.P67.....PostScript
                   PowerShell see QA76.73.W56
                   76.73.P75.....Processing
                   76.73.P76.....Prolog
                   76.73.P98.....Python
                   76.73.R25.....RPG
                   76.73.R3......R
                   76.73.R33....Racket
                   76.73.R83....Ruby
                   76.73.R87....Rust
                   76.73.S15.....S
                   76.73.S27.....SAS
                   76.73.S28.....Scala
                   76.73.S34.....Scheme
                   76.73.S345...Scratch
                   76.73.S35.....SDL
                   76.73.S59.....SPARK
                   76.73.S62.....SPARQL
                   76.73.S67.....SQL. MySQL
                   76.73.S95.....Swift
                   76.73.T44......Tcl
                   76.73.T97......TypeScript
                   76.73.U63......UPC
                   76.73.V27......VBScript
                   Visual Basic see QA76.73.M53
                   76.73.W56.....Windows PowerShell
                   76.73.W65.....Wolfram language
                   76.73.X16......X86 assembly language
                   76.73.X57......XPath
                   76.73.X58......XSLT
                   76.73.Z2.........Z
                76.75-76.765...Computer software
                   76.75...........Periodicals. Societies. Serials
                   76.751........Congresses
                   76.752........Dictionaries
                   76.753........Catalogs
                   76.754........General works
                   76.755........Handbooks, tables, etc.
                   76.756........Addresses, essays, lectures
                   76.758........Software engineering
                   76.76.A-Z.....Special topics, A-Z
                      76.76.A54....AngularJS
                      76.76.A63....Application program interfaces
                      76.76.A65....Application software
                      76.76.A87....Assemblers
                      76.76.A98....Automatic differentiations
                      76.76.C47....Certification of software
                      76.76.C54....Children's software
                      76.76.C64....Compatibility of software
                      76.76.C65....Compilers
                      76.76.C66....Component software
                      76.76.C672...Computer games
                      76.76.C68....Computer viruses
                      76.76.C69....Configuration management
                      76.76.C73....Costs
                      76.76.D47....Development
                      76.76.D49....Device drivers
                      76.76.D57....Disassemblers Including decompilers
                      76.76.D63....Documentation of software
                      76.76.E93....Evaluation of software
                      76.76.E95....Expert systems
                      76.76.F34....Failures of software
                      76.9.F48.....File conversion software
                      76.76.F75....Free computer software
                      76.76.G46....Generators
                      76.76.H85....Human factors
                      76.76.H94....Hypertext systems Including hypertext document markup languages, e. g. HTML (Document markup language), etc.
                      76.76.I55....Install programs
                      76.76.I57....Integrated software
                      76.76.I58....Intelligent agents
                      76.76.I59....Interactive media. Hypermedia
                      76.76.S65....Measurement, Software
                      76.76.M52....Microsoft .NET
                      76.76.M54....Middleware Including object monitors
                      76.76.O63....Operating systems Including DOS, UNIX, OS/2, etc.
                      76.76.P37....Patterns, Software
                      76.76.P74....Productivity
                      76.76.P76....Protection of software
                      76.76.Q35....Quality control
                      76.76.R42....Refactoring of software
                      76.76.R44....Reliability
                      76.76.R47....Reusability
                      76.76.S27.....SAP NetWeaver Gateway
                      76.76.S37....Screen savers
                      76.76.S375...Self-adaptive software
                      76.76.S46....Shareware
                      76.76.F34....Software failures
                      76.76.S63....Software frameworks
                      76.76.S64....Software maintenance
                      76.76.S65....Software measurement
                      76.76.S66....Software support
                      76.76.S69....Spyware
                      76.76.S73....Standards for software
                      76.76.S95....Systems software
                      76.76.T45....Teleprocessing monitors
                      76.76.T47....Termination
                      76.76.T48....Testing of software
                      76.76.T49....Text editors
                      76.76.T55....Threads
                      76.76.T83....Translators
                      76.76.U84....Utilities
                      76.76.V47....Verification and validation of software
                      76.76.C68....Viruses
                      76.76.W56....Windows
                      76.76.S64....Year 2000 date conversion
                   76.765........Firm-ware
                   76.77.........Operating Systems
                      76.76.T48.........General works
                      76.774.A-Z........Individual operating systems. By system, A-Z
                         76.774.A53........Android
                         76.774.B47........Berkeley BSD
                         76.774.D67........DOS
                         76.774.F74........FreeBSD
                         76.774.I67........iOS
                         76.774.L46........Linux
                         76.774.M33........Mac OS
                         76.774.M43........Microsoft Windows 7
                         76.774.M434.......Microsoft Windows 8
                         76.774.M435.......Microsoft Windows 10
                         76.774.M48........Microsoft Windows Me
                         76.774.M53........Microsoft Windows NT
                         76.774.M55........Microsoft Windows server
                         76.774.M56........Microsoft Windows Vista
                         76.774.M58........Microsoft Windows XP
                         76.774.S65........Solaris
                         76.774.U28........Ubuntu
                         76.774.U64........UNIX
                   76.8.A-Z......Special computers, computer systems, and microprocessors. By name, A-Z
                      76.8.A54......AN/FSQ-7
       101-145...........Elementary mathematics. Arithmetic
       150-272.5.........Algebra
       273-280...........Probabilities. Mathematical statistics
       299.6-433.........Analysis
       440-699...........Geometry. Trigonometry. Topology
       801-939...........Analytic mechanics

## QB - Astronomy

    1-991..........Astronomy
       1-139.........General
       140-237.......Practical and spherical astronomy
       275-343.......Geodesy
       349-421.......Theoretical astronomy and celestial mechanics
       455-456.......Astrogeology
       460-466.......Astrophysics
       468-480.......Non-optical methods of astronomy
       495-903.......Descriptive astronomy
          500.5-785....Solar System
          799-903......Stars
       980-991.......Cosmology

## QC - Physics

    1-999..............Physics
       1-75..............General
       81-114............Weights and measures
       120-168.85........Descriptive and experimental mechanics
       170-197...........Atomic physics. Constitution and properties of matter including molecular physics, relativity, quantum theory and solid state physics
       221-246...........Acoustics. Sound
       251-338.5.........Heat
          310.15-319.......Thermodynamics
       350-467...........Optics. Light
          450-467..........Spectroscopy
       474-496.9.........Radiation physics (General)
       501-766...........Electricity and magnetism
          501-721..........Electricity
             669-675.8.......Electromagnetic theory
             676-678.6.......Radio waves (Theory)
             680.............Quantum Electrodynamics
             701-715.4.......Electric discharge
             717.6-718.8.....Plasma physics. Ionized gases
          750-766..........Magnetism
       770-798...........Nuclear and particle physics. Atomic energy. Radioactivity
          793-793.5........Elementary particle physics
          794.95-798.......Radioactivity and radioactive substances
       801-809...........Geophysics. Cosmic physics
       811-849...........Geomagnetism
       851-999...........Meteorology. Climatology (including the Earth's atmosphere)
          974.5-976........Meteorological optics
          980-999..........Climatology and weather
             994.95-999......Weather forecasting

## QD - Chemistry

    1-999..............Chemistry
       1-65..............General (including alchemy)
       71-142............Analytical chemistry
       146-197...........Inorganic chemistry
       241-441...........Organic chemistry
          415-436..........Biochemistry
       450-801...........Physical and theoretical chemistry
          625-655..........Radiation chemistry
          701-731..........Photochemistry
       901-999...........Crystallography

## QE - Geology

    1-996.5............Geology
       1-350.62..........General (including geographical divisions)
       351-399.2.........Mineralogy
       420-499...........Petrology
       500-639.5.........Dynamic and structural geology
          521-545..........Volcanoes and earthquakes
          601-613.5........Structural geology
       640-699...........Stratigraphy
       701-760...........Paleontology
       760.8-899.2.......Paleozoology
       901-996.5.........Paleobotany

## QH - Natural history - Biology

    1-278.5............Natural History (General)
       1-199.5...........General (including nature conservation, geographical distribution)
       201-278.5.........Microscopy
    301-705.5..........Biology (General)
       359-425...........Evolution
       426-470...........Genetics
       471-489...........Reproduction
       501-531...........Life
       540-549.5.........Ecology
       573-671...........Cytology
       705-705.5.........Economic biology

## QK - Botany

    1-989..............Botany
       1-474.5...........General (including geographical distribution)
       474.8-495.........Spermatophyta. Phanerogams
          494-494.5........Gymnosperms
          495..............Angiosperms
       504-638...........Cryptogams
       640-707...........Plant anatomy
       710-899...........Plant physiology
       900-989...........Plant ecology

## QL - Zoology

    1-991..............Zoology
       1-355.............General (including geographical distribution)
       360-599.82........Invertebrates
          461-599.82.......Insects
       605-739.8.........Chordates. Vertebrates
          614-639.8........Fishes
          640-669.3........Reptiles and amphibians
          671-699..........Birds
          700-739.8........Mammals
       750-795...........Animal behavior
          791-795..........Stories and anecdotes
       799-799.5.........Morphology
       801-950.9.........Anatomy
       951-991...........Embryology

## QM - Human anatomy

    1-695..............Human anatomy
       1-511.............General
       531-549...........Regional anatomy
       550-577.8.........Human and comparative histology
       601-695...........Human embryology

## QP - Physiology

    1-981..............Physiology
       1-345.............General (including influence of the environment)
       351-495...........Neurophysiology and neuropsychology
       501-801...........Animal biochemistry
       901-981...........Experimental pharmacology

## QR - Microbiology

    1-502..............Microbiology
       1-74.5............General
       75-99.5...........Bacteria
       99.6-99.8.........Cyanobacteria
       100-130...........Microbial ecology
       171...............Microorganisms in the animal body
       180-198.5.........Immunology
       355-502...........Virology