Library of Congress Classification:Class Q -- Science

Last updated July 07, 2025

Class Q: Science is a classification used by the Library of Congress Classification system. This article outlines the subclasses of Class Q.^[1]^[2]

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

References

↑ "Library of Congress Classification Outline: Class Q - Science" (PDF). Library of Congress. 2019-05-01. Retrieved 2021-10-27.
↑ "Library of Congress Classification Full Text: Class Q - Science" (PDF). Library of Congress. 2019-05-01. Retrieved 2021-10-27.