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Library of Congress Subject Areas (11)
- A General Works
  - AC Collections. Series. Collected works
  - AI Indexes (General)
  - AM Museums (General). Collectors and collecting (General)
  - AS Academies and learned societies (General)
  - AZ History of Scholarship The Humanities
- B Philosophy. Psychology. Religion
  - B Philosophy (General)
  - BC Logic
  - BD Speculative Philosophy
  - BF Psychology
  - BH Aesthetics
  - BJ Ethics
  - BL Religion
  - BM Judaism
  - BP Islam. Bahaism. Theosophy, etc
  - BQ Buddhism
  - BR Christianity
  - BS The Bible
  - BT Doctrinal Theology
  - BV Practical Theology
    - BV1460 Religious Education
  - BX Christian Denominations
- C Auxiliary Sciences of History
  - C Auxiliary sciences of history (General)
  - CB History of civilization
  - CC Archaeology
  - CD Diplomatics. Archives. Seals
    - CD921 Archives
  - CE Technical chronology. Calendar
  - CJ Numismatics
  - CN Inscriptions. Epigraphy.
  - CR Heraldry
  - CS Genealogy
  - CT Biography
- D History General and Old World
  - D History (General)
    - D051 Ancient History
    - D111 Medieval History
    - D204 Modern History
    - D501 World War I
    - D731 World War II
    - D839 Post-war History, 1945 on
    - D880 Developing Countries
    - D890 Eastern Hemisphere
    - D901 Europe (General)
  - DA Great Britain
    - DAW Central Europe
  - DB Austria
  - DC France
  - DD Germany
  - DE The Mediterranean Region. The Greco-Roman World
  - DF Greece
  - DG Italy
  - DH Netherlands (The Low Countries)
  - DJ Netherlands (Holland)
    - DJK Eastern Europe
  - DK Russia. Soviet Union. Former Soviet Republics
  - DL Northern Europe. Scandinavia
  - DP Spain
  - DR Balkan Peninsula
  - DS Asia
  - DT Africa
  - DU Oceania (South Seas)
- E History America
  - E11 America (General)
  - E151 United States (General)
- F History United States, Canada, Latin America
  - F001 United States local history
  - F1001 Canada (General)
  - F1201 Latin America (General)
- G Geography. Anthropology. Recreation
  - G Geography (General)
  - GA Mathematical geography. Cartography
  - GB Physical geography
  - GC Oceanography
  - GE Environmental Sciences
  - GF Human ecology. Anthropogeography
  - GN Anthropology
  - GR Folklore
  - GT Manners and customs
  - GV Recreation Leisure
- H Social Sciences
  - H Social Sciences (General)
  - HA Statistics
  - HB Economic Theory
  - HC Economic History and Conditions
  - HD Industries. Land use. Labor
    - HD28 Management. Industrial Management
    - HD61 Risk Management
  - HE Transportation and Communications
  - HF Commerce
    - HF5601 Accounting
  - HG Finance
  - HJ Public Finance
  - HM Sociology
  - HN Social history and conditions. Social problems. Social reform
  - HQ The family. Marriage. Woman
  - HS Societies secret benevolent etc
  - HT Communities. Classes. Races
  - HV Social pathology. Social and public welfare
  - HX Socialism. Communism. Anarchism
- J Political Science
  - J General legislative and executive papers
  - JA Political science (General)
  - JC Political theory
  - JF Political institutions (General)
  - JK Political institutions (United States)
  - JL Political institutions (America except United States)
  - JN Political institutions (Europe)
    - JN101 Great Britain
    - JN1187 Scotland
  - JQ Political institutions Asia
  - JS Local government Municipal government
  - JV Colonies and colonization. Emigration and immigration. International migration
  - JX International law
  - JZ International relations
- K Law
  - K Law (General)
  - KD England and Wales
    - KDC Scotland
  - KF United States Federal Law
  - KZ Law of Nations
- L Education
  - L Education (General)
  - LA History of education
  - LB Theory and practice of education
    - LB1501 Primary Education
    - LB1603 Secondary Education. High schools
    - LB2300 Higher Education
    - LB2361 Curriculum
  - LC Special aspects of education
    - LC5201 Education extension. Adult education. Continuing education
  - LD Individual institutions (United States)
  - LE Individual institutions (America except United States)
  - LF Individual institutions (Europe)
  - LG Individual institutions (Asia. Africa)
  - LT Textbooks
- M Music and Books on Music
  - M Music
  - ML Literature of music
  - MT Musical instruction and study
- N Fine Arts
  - N Visual arts (General) For photography, see TR
  - NA Architecture
  - NB Sculpture
  - NC Drawing Design Illustration
  - ND Painting
  - NE Print media
  - NK Decorative arts Applied arts Decoration and ornament
  - NX Arts in general
- P Language and Literature
  - P Philology. Linguistics
  - PA Classical philology
  - PB Modern European Languages
    - PB1501 Gaelic (Scottish Gaelic, Erse)
  - PC Romance languages
  - PD Germanic languages
  - PE English
  - PF West Germanic
  - PG Slavic, Baltic, Albanian languages and literature
  - PH Finno-Ugrian, Basque languages and literatures
  - PI Oriental languages and literatures
  - PJ Semitic
  - PK Indo-Iranian
  - PL Languages and literatures of Eastern Asia, Africa, Oceania
  - PM Hyperborean, Indian, and Artificial languages
  - PN Literature (General)
    - PN0080 Criticism
    - PN0441 Literary History
    - PN1990 Broadcasting
    - PN1993 Motion Pictures
    - PN2000 Dramatic representation. The Theater
  - PQ Romance literatures
  - PR English literature
  - PS American literature
  - PT Germanic literature
  - PZ Childrens literature
- Q - SCIENCE (9)
  - Q1-390 Science (General)
    - Q300-390 Cybernetics
    - Q350-390 Information theory
  - QA1-939 --- Mathematics (2)
    - QA01-43 General (1)
      - QA08 Philosophy of Mathematics
      - QA09-QA10 Mathematical logic (1)
      - QA11-QA20 Study and teaching. Research
      - QA21-QA33 History
      - QA41 Formulas, notation, abbreviations
    - QA075-76.95 Calculating machines
      - QA75.5 Computers
      - QA76 Software
        QA76.17 History
        QA76.2 Biography
        QA76.38 Hybrid computers
        QA76.4 Analog computers
        QA76.5 Digital computers
        QA76.6 Programming
        QA76.71 Individual programs and operating systems
        QA76.72 Applications
        QA76.8 Special computers
        QA76.85 Fifth generation computers
        QA76.9 Other topics (prefer QA76_76 for software topics)
        QA76.9.A23 Abstract data types
        QA76.9.A73 Architecture, Computer
        QA76.9.A955 Automatic hypothesis formation
        QA76.9.A96 Automatic theorem proving
        QA76.9.C62 Computer arithmetic
        QA76.9.C64 Computer literacy
        QA76.9.C643 Computer organization
        QA76.9.C65 Computer simulation
        QA76.9.C659 Computers and children
        QA76.9.C66 Computers and civilization
        QA76.9.D6 Documentation
        QA76.9.E25 Economic aspects
        QA76.9.E94 Evaluation of computer performance
        QA76.9.F35 Computers and family
        QA76.9.F38 Fault tolerant computing
        QA76.9.G3 Game theory
        QA76.9.G68 Government policy
        QA76.9.G7 Graphics (cf QA76_76.I4)
        QA76.9.H36 Hashing
        QA76.9.I55 Input design
        QA76.9.I58 Interactive computer systems
        QA76.9.M35 Mathematics, Computer
        QA76.9.M65 Moral and religious aspects
        QA76.9.P75 Psychological aspects
        QA76.9.S8 Standards
        QA76.9.S84 Structured techniques
        QA76.9.S88 System design
        QA76.9.V5 Virtual computer systems
    - QA093 Popular mathematical works
    - QA095 Mathematical recreations
    - QA099 Mathematical curiosities
    - QA101-QA145 Elementary mathematics
    - QA150-QA272 Algebra (1)
      - QA162 Abstract algebra
      - QA164 Combinatorics
      - QA166 Graph theory
      - QA184-QA205 Linear and multilinear algebras. Matrices
        QA186 Vector spaces
        QA188-QA199 Matrices
        QA200 Vector and tensor algebras
      - QA211-QA224 Theory of equations
      - QA241-QA255 Theory of numbers
    - QA273-QA275 Probabilities
    - QA276-280 Mathematical Statistics
    - QA297-QA299.4 Numerical analysis
    - QA299.6-433 Analysis
      - QA303-312 Calculus
      - QA315-316 Calculus of variations
      - QA319-329 Functional Analysis
      - QA331-355 Theory of Functions
        QA342 Logarithmic, circular, and exponential functions
        QA343 Elliptic functions, elliptic integrals, modular functions
      - QA370-387 Differential Equations
    - QA440-699 Geometry, Trigonometry, Topology
      - QA531-538 Trigonometry
      - QA611-614 Topology
    - QA801-939 Analytic Mechanics
      - QA841-QA842 Kinematics
      - QA843-QA871 Dynamics
      - QA901-QA930 Mechanics of deformable bodies. Fluid mechanics.
      - QA931-QA939 Elasticity. Plasticity.
  - QB1-991 Astronomy (2)
    - QB140-237 Practical and spherical astronomy
    - QB275-343 Geodesy
    - QB349-421 Theoretical astronomy and celestial mechanics
    - QB455-456 Astrogeology
    - QB460-466 Astrophysics
    - QB468-480 Non-optical methods of astronomy
    - QB495-903 Descriptive astronomy
      - QB500.5-785 Solar system
        QB600 Planets
      - QB790 Interstellar Matter
        QB791.3 Dark Matter
      - QB799-903 Stars
        QB851 Clusters and nebulae
        QB856 Galaxies
        QB860 Quasars
        QB870 Stellar spectroscopy
    - QB980-991 Cosmogony. Cosmology (2)
      - QB991.B54 Big bang theory
      - QB991.C64 Cosmic background radiation
      - QB991.C65 Cosmic rotation
      - QB991.C66 Cosmological distances
      - QB991.C87 Curvature cosmology
      - QB991.C92 Cyclic universe theory
      - QB991.E53 End of the universe
      - QB991.E94 Expanding universe (2)
      - QB991.G73 Great Attractor
      - QB991.I54 Inflationary universe
      - QB991.L37 Large scale structure
      - QB991.N34 Naked singularities
      - QB991.P45 Phase transformations
      - QB991.Q36 Quantum cosmology
      - QB991.T67 Topological defects
  - QC1-999 Physics (5)
    - QC081-114 Weights and measures
    - QC1-75 General physics (1)
      - QC05 Dictionaries and encyclopaedias
      - QC07-9 History of physics
      - QC16.A-Z Biographies of individuals A-Z
      - QC20 Mathematical physics
    - QC120-168.86 Descriptive and experimental mechanics
      - QC133-137.5 Dynamics
        QC136 Vibration
      - QC138-168.86 Fluids, fluid mechanics
        QC150-168.86 Fluid dynamics
        QC168-168.86 Gas dynamics
        QC157 Waves
        QC161-167 Gases
        QC166 Vacuum
    - QC170-197 Atomic physics (4)
      - QC173-QC197 Constitution and properties of matter (4)
        QC173.4.C65 Condensed matter
        QC173.4.S94 Surfaces
        QC173.5-173.65 Relativity physics
        QC173.59.S65 Space and time
        QC173.6 General relativity [Physics]
        QC173.65 Special relativity
        QC173.7 Field theory
        QC173.96-174.52 Quantum theory (4)
        QC174.17.S9 Symmetry and supergravity
        QC174.2-174.26 Wave mechanics
        QC174.45 Quantum field theory
        QC174.8-175.47 Statistical physics
        QC176 - 179 Solid state physics
        QC178 Gravitation
    - QC221-246 Acoustics
      - QC244 Ultrasonics
    - QC251-338.5 Heat
      - QC278 Low temperature
      - QC310.15-319 Thermodynamics
        QC311.5 Statistical thermodynamics
      - QC320-338.5 Heat transfer
    - QC350-467 Optics, light
      - QC446.2-446.3 Nonlinear optics, quantum optics
      - QC450-467 Spectroscopy
        QC457 Infra-red spectrum
        QC459 Ultra-violet spectrum
    - QC474-496.9 Radiation physics
      - QC481 X-rays
      - QC482.D5 Diffraction
      - QC485 Cosmic ray physics
      - QC491 Mossbauer effect
      - QC495 Colour
    - QC501-766 Electricity and magnetism
      - QC501-721 Electricity
        QC570-597 Electrostatics
        QC584-597 Dielectrics
        QC610.9-611.8 Semiconductor physics
        QC621.S8 Superconductivity
        QC631 Electrodynamics
        QC660.5-700 Electric oscillations, electric waves
        QC665.E4 Electromagnetic fields
        QC676-678.6 Radio waves
        QC717.6-718.8 Plasma physics, ionized gases
      - QC750-766 Magnetism
        QC762 Nuclear magnetic resonance
    - QC770-798 Nuclear and particle physics, atomic energy,radioactivity
      - QC793-793.5 Elementary particle physics
        QC793.3.F5 Field theories
        QC793.3.H5 High energy physics
        QC793.3.S9 Symmetry
      - QC794.6.S3 Scattering
      - QC794.6.S85 String models
      - QC794.95-798 Radioactivity and radioactive substances
    - QC801-809 Geophysics
    - QC811-849 Geomagnetism
    - QC851-999 Meteorology
      - QC980-989 Climatology and weather
        QC981.8.C5 Climate change
  - QD1-999 Chemistry
    - QD071-142 Analytical chemistry
    - QD146-197 Inorganic chemistry
    - QD241-441 Organic chemistry
      - QD415-436 Biochemistry
    - QD450-801 Physical and theoretical chemistry
      - QD625-655 Radiation chemistry
      - QD701-731 Photochemistry
    - QD901-999 Crystallography
  - QE1-996.5 Geology
    - QE351-399.2 Mineralogy
    - QE420-499 Petrology
    - QE500-639.5 Dynamic and structural geology
      - QE521-545 Volcanoes and earthquakes
      - QE601-613.5 Structural geology
    - QE640-699 Stratigraphy
    - QE701-760 Paleontology
    - QE760.8-899.2 Paleozoology
    - QE901-996.5 Paleobotany
  - QH1-278.5 Natural history (General)
    - QH201-278.5 Microscopy
    - QH301-705.5 Biology (General)
      - QH359-425 Evolution
      - QH426-470 Genetics
      - QH471-489 Reproduction
      - QH501-531 Life
      - QH540-549.5 Ecology
      - QH573-671 Cytology
      - QH705-705.5 Economic biology
  - QK1-989 Botany
    - QK474.8-495 Spermatophyta. Phanerogams
    - QK494-494.5 Gymnosperms
    - QK495 Angiosperms
    - QK504-(638) Cryptogams
    - QK640-(707) Plant anatomy
    - QK710-899 Plant physiology
    - QK900-989 Plant ecology
  - QL1-991 Zoology
    - QL360-599.82 Invertebrates
      - QL461-599.82 Insects
    - QL605-739.8 Chordates. Vertebrates
      - QL614-639.8 Fishes
      - QL640-669.3 Reptiles and amphibians
      - QL671-699 Birds
      - QL700-739.8 Mammals
      - QL750-795 Animal behavior
        QL791-795 Stories and anecdotes
      - QL799-799.5 Morphology
      - QL801-950.9 Anatomy
      - QL951-991 Embryology
  - QM1-695 Human anatomy
    - QM531-549 Regional anatomy
    - QM550-577.8 Human and comparative histology
    - QM601-695 Human embryology
  - QP1-981 Physiology
    - QP351-495 Neurophysiology and neuropsychology
    - QP501-801 Animal biochemistry
    - QP901)-(981) Experimental pharmacology
  - QR1-502 Microbiology
    - QR075-99.5 Bacteria
    - QR099.6-99.8 Cyanobacteria
    - QR100-130 Microbial ecology
    - QR171 Microorganisms in the animal body
    - QR180-189.5 Immunology
    - QR355-502 Virology
- R Medicine
  - R Medicine (General)
  - RA Public aspects of medicine
    - RA0421 Public health. Hygiene. Preventive Medicine
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine
  - RB Pathology
  - RC Internal medicine
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
    - RC1200 Sports Medicine
  - RD Surgery
  - RE Ophthalmology
  - RF Otorhinolaryngology
  - RG Gynecology and obstetrics
  - RJ Pediatrics
    - RJ101 Child Health. Child health services
  - RK Dentistry
  - RL Dermatology
  - RM Therapeutics. Pharmacology
  - RS Pharmacy and materia medica
  - RT Nursing
  - RV Botanic, Thomsonian, and eclectic medicine
  - RX Homeopathy
  - RZ Other systems of medicine
- S Agriculture
  - S Agriculture (General)
  - SB Plant culture
  - SD Forestry
  - SF Animal culture
  - SH Aquaculture. Fisheries. Angling
  - SK Hunting sports
- T Technology (1)
  - T Technology (General)
    - T201 Patents. Trademarks
  - TA Engineering (General). Civil engineering (General)
  - TC Hydraulic engineering. Ocean engineering
  - TD Environmental technology. Sanitary engineering
  - TE Highway engineering. Roads and pavements
  - TF Railroad engineering and operation
  - TG Bridge engineering
  - TH Building construction
  - TJ Mechanical engineering and machinery
  - TK Electrical engineering. Electronics Nuclear engineering
  - TL Motor vehicles. Aeronautics. Astronautics (1)
  - TN Mining engineering. Metallurgy
  - TP Chemical technology
  - TR Photography
  - TS Manufactures
  - TT Handicrafts Arts and crafts
  - TX Home economics
- U Military Science
  - U Military Science (General)
- V Naval Science
  - V Naval Science (General)
  - VM Naval architecture. Shipbuilding. Marine engineering
- Z Bibliography. Library Science. Information Resources (1)
  - Z004 Books. Writing. Paleography
  - Z665 Library Science. Information Science
  - Z719 Libraries (General)
  - ZA Information resources (1)
    - ZA4050 Electronic information resources (1)
    - ZA4450 Databases

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