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Library of Congress Subject Areas (18120)
- A General Works (81)
  - AC Collections. Series. Collected works (26)
  - AI Indexes (General) (30)
  - 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 (52)
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- H Social Sciences (6222)
  - H Social Sciences (General) (1291)
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  - HD Industries. Land use. Labor (833)
    - HD1401 Agriculture-Economic aspects (101)
    - HD28 Management. Industrial Management (294)
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- L Education (843)
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- M Music and Books on Music (15)
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- N Fine Arts (1048)
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    - N400-3990 Art museums, galleries, etc. (17)
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- P Language and Literature (440)
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    - P302-302.87 Discourse analysis (5)
    - P87 Communication. Mass Media (337)
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- Q Science (1448)
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    - QA76.87 Neural computers (36)
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- R Medicine (28)
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  - RS Pharmacy and materia medica (2)
  - RZ Other systems of medicine (1)
- S Agriculture (1455)
  - S Agriculture (General) (1244)
    - S590-599.9 Soils. Soil science (161)
    - S631-667 Fertilizers and Improvement of the soil (149)
  - SB Plant culture (259)
    - SB599-990.5 Pests and Diseases (64)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (134)
  - SD Forestry (25)
  - SF Animal culture (22)
  - SH Aquaculture. Fisheries. Angling (25)
  - SK Hunting sports (1)
- T Technology (5715)
  - T Technology (General) (2021)
    - T55.4-60.8 Industrial engineering. Management engineering (481)
    - T201 Patents. Trademarks (8)
    - T385 Computer Graphics (125)
    - T58.6-58.62 Management Information Systems (590)
  - TA Engineering (General). Civil engineering (General) (654)
  - TC Hydraulic engineering. Ocean engineering (12)
  - TD Environmental technology. Sanitary engineering (923)
  - TE Highway engineering. Roads and pavements (52)
  - TF Railroad engineering and operation (9)
  - TG Bridge engineering (9)
  - TH Building construction (76)
  - TJ Mechanical engineering and machinery (58)
  - TK Electrical engineering. Electronics Nuclear engineering (112)
    - TK5105 Computer Network (47)
    - TK5105.882 Internet (42)
    - TK5105.888 World Wild Web (46)
  - TL Motor vehicles. Aeronautics. Astronautics (3)
  - TN Mining engineering. Metallurgy (7)
  - TP Chemical technology (1878)
    - TP155 Chemical engineering (1402)
    - TP368 Food processing and manufacture (340)
    - TP500 Fermentation industries. Beverages. Alcohol (16)
  - TR Photography (12)
  - TS Manufactures (261)
    - TS 155-194 Production Management, Operations Management (185)
    - TS 180-TS180.8 Material Handling (13)
  - 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)