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Library of Congress Subject Areas (17786)
- A General Works (79)
  - AC Collections. Series. Collected works (25)
  - AI Indexes (General) (29)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (28)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (39)
  - B Philosophy (General) (4)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (5)
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- E History America (1)
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- G Geography. Anthropology. Recreation (51)
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- H Social Sciences (6029)
  - H Social Sciences (General) (1274)
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  - HD Industries. Land use. Labor (809)
    - HD1401 Agriculture-Economic aspects (101)
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- L Education (839)
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- M Music and Books on Music (15)
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- N Fine Arts (1026)
  - N Visual arts (417)
    - N400-3990 Art museums, galleries, etc. (17)
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- P Language and Literature (439)
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    - P302-302.87 Discourse analysis (5)
    - P87 Communication. Mass Media (336)
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- Q Science (1433)
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    - QA76.87 Neural computers (33)
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    - QA76 Computer software (182)
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- R Medicine (25)
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  - RS Pharmacy and materia medica (2)
  - RZ Other systems of medicine (1)
- S Agriculture (1432)
  - S Agriculture (General) (1224)
    - S590-599.9 Soils. Soil science (161)
    - S631-667 Fertilizers and Improvement of the soil (147)
  - SB Plant culture (252)
    - SB599-990.5 Pests and Diseases (60)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (131)
  - SD Forestry (25)
  - SF Animal culture (22)
  - SH Aquaculture. Fisheries. Angling (25)
  - SK Hunting sports (1)
- T Technology (5638)
  - T Technology (General) (1981)
    - T55.4-60.8 Industrial engineering. Management engineering (471)
    - T201 Patents. Trademarks (8)
    - T385 Computer Graphics (118)
    - T58.6-58.62 Management Information Systems (577)
  - TA Engineering (General). Civil engineering (General) (636)
  - TC Hydraulic engineering. Ocean engineering (12)
  - TD Environmental technology. Sanitary engineering (918)
  - TE Highway engineering. Roads and pavements (51)
  - TF Railroad engineering and operation (9)
  - TG Bridge engineering (9)
  - TH Building construction (75)
  - TJ Mechanical engineering and machinery (57)
  - TK Electrical engineering. Electronics Nuclear engineering (110)
    - TK5105 Computer Network (45)
    - TK5105.882 Internet (41)
    - TK5105.888 World Wild Web (46)
  - TL Motor vehicles. Aeronautics. Astronautics (3)
  - TN Mining engineering. Metallurgy (7)
  - TP Chemical technology (1870)
    - TP155 Chemical engineering (1402)
    - TP368 Food processing and manufacture (332)
    - TP500 Fermentation industries. Beverages. Alcohol (16)
  - TR Photography (12)
  - TS Manufactures (254)
    - TS 155-194 Production Management, Operations Management (181)
    - TS 180-TS180.8 Material Handling (12)
  - TT Handicrafts Arts and crafts (11)
  - TX Home economics (18)
- U Military Science (8)
  - U Military Science (General) (8)
- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (71)
  - Z004 Books. Writing. Paleography (4)
  - Z665 Library Science. Information Science (43)
  - Z719 Libraries (General) (10)
  - ZA Information resources (22)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (12)