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Library of Congress Subject Areas (22348)
- A General Works (129)
  - AC Collections. Series. Collected works (40)
  - AI Indexes (General) (39)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (50)
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- B Philosophy. Psychology. Religion (52)
  - B Philosophy (General) (5)
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- C Auxiliary Sciences of History (8)
  - C Auxiliary sciences of history (General) (1)
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    - CD921 Archives (1)
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- D History General and Old World (10)
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- E History America (2)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (71)
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- H Social Sciences (7548)
  - H Social Sciences (General) (1704)
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  - HC Economics (1989)
  - HD Industries. Land use. Labor (1028)
    - HD1401 Agriculture-Economic aspects (112)
    - HD28 Management. Industrial Management (368)
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- J Political Science (1156)
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- L Education (925)
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- M Music and Books on Music (20)
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- N Fine Arts (1145)
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    - N400-3990 Art museums, galleries, etc. (19)
    - N61-72 Theory. Philosophy. Aesthetics of the visual arts (54)
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  - NA Architecture (477)
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  - NX Arts in general (165)
- P Language and Literature (468)
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- Q Science (1785)
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    - QA76.87 Neural computers (59)
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    - QA76 Computer software (226)
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- R Medicine (34)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
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    - RJ101 Child Health. Child health services (1)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (2)
  - RS Pharmacy and materia medica (2)
  - RZ Other systems of medicine (1)
- S Agriculture (1899)
  - S Agriculture (General) (1624)
    - S590-599.9 Soils. Soil science (224)
    - S631-667 Fertilizers and Improvement of the soil (185)
  - SB Plant culture (339)
    - SB599-990.5 Pests and Diseases (94)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (163)
  - SD Forestry (40)
  - SF Animal culture (28)
  - SH Aquaculture. Fisheries. Angling (32)
  - SK Hunting sports (2)
- T Technology (7277)
  - T Technology (General) (2619)
    - T55.4-60.8 Industrial engineering. Management engineering (646)
    - T201 Patents. Trademarks (8)
    - T385 Computer Graphics (146)
    - T58.6-58.62 Management Information Systems (704)
  - TA Engineering (General). Civil engineering (General) (761)
  - TC Hydraulic engineering. Ocean engineering (14)
  - TD Environmental technology. Sanitary engineering (1216)
  - TE Highway engineering. Roads and pavements (67)
  - TF Railroad engineering and operation (16)
  - TG Bridge engineering (14)
  - TH Building construction (95)
  - TJ Mechanical engineering and machinery (137)
  - TK Electrical engineering. Electronics Nuclear engineering (132)
    - TK5105 Computer Network (57)
    - TK5105.882 Internet (48)
    - TK5105.888 World Wild Web (51)
  - TL Motor vehicles. Aeronautics. Astronautics (8)
  - TN Mining engineering. Metallurgy (9)
  - TP Chemical technology (2432)
    - TP155 Chemical engineering (1859)
    - TP368 Food processing and manufacture (425)
    - TP500 Fermentation industries. Beverages. Alcohol (18)
  - TR Photography (14)
  - TS Manufactures (347)
    - TS 155-194 Production Management, Operations Management (247)
    - TS 180-TS180.8 Material Handling (26)
  - TT Handicrafts Arts and crafts (14)
  - TX Home economics (21)
- U Military Science (10)
  - U Military Science (General) (10)
- V Naval Science (10)
  - V Naval Science (General) (3)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (85)
  - Z004 Books. Writing. Paleography (5)
  - Z665 Library Science. Information Science (46)
  - Z719 Libraries (General) (14)
  - ZA Information resources (31)
    - ZA4050 Electronic information resources (11)
    - ZA4450 Databases (16)