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Library of Congress Subject Areas (20702)
- A General Works (13)
  - AC Collections. Series. Collected works (5)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (6)
- B Philosophy. Psychology. Religion (1935)
  - B Philosophy (General) (141)
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    - BV1460 Religious Education (4)
- C Auxiliary Sciences of History (30)
  - C Auxiliary sciences of history (General) (6)
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- D History General and Old World (266)
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- E History America (15)
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- F History United States, Canada, Latin America (5)
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- G Geography. Anthropology. Recreation (1239)
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- H Social Sciences (5529)
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- J Political Science (255)
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- L Education (1756)
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- M Music and Books on Music (190)
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- N Fine Arts (903)
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- P Language and Literature (910)
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- Q Science (5582)
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- R Medicine (2551)
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  - RB Pathology (54)
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  - RM Therapeutics. Pharmacology (193)
  - RS Pharmacy and materia medica (319)
  - RT Nursing (427)
  - RV Botanic, Thomsonian, and eclectic medicine (27)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (65)
- S Agriculture (2218)
  - S Agriculture (General) (1816)
  - SB Plant culture (563)
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  - SH Aquaculture. Fisheries. Angling (77)
- T Technology (3468)
  - T Technology (General) (960)
    - T201 Patents. Trademarks (5)
  - TA Engineering (General). Civil engineering (General) (1141)
  - TC Hydraulic engineering. Ocean engineering (28)
  - TD Environmental technology. Sanitary engineering (244)
  - TE Highway engineering. Roads and pavements (11)
  - TF Railroad engineering and operation (15)
  - TG Bridge engineering (7)
  - TH Building construction (248)
  - TJ Mechanical engineering and machinery (246)
  - TK Electrical engineering. Electronics Nuclear engineering (625)
  - TL Motor vehicles. Aeronautics. Astronautics (99)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (186)
  - TR Photography (29)
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- U Military Science (14)
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- V Naval Science (75)
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  - VM Naval architecture. Shipbuilding. Marine engineering (54)
- Z Bibliography. Library Science. Information Resources (169)
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  - Z665 Library Science. Information Science (31)
  - Z719 Libraries (General) (8)
  - ZA Information resources (59)
    - ZA4050 Electronic information resources (18)
    - ZA4450 Databases (5)