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Library of Congress Subject Areas (37589)
- A General Works (13)
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- B Philosophy. Psychology. Religion (69)
  - B Philosophy (General) (22)
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- C Auxiliary Sciences of History (67)
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  - CB History of civilization (9)
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- D History General and Old World (42)
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- E History America (6)
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- F History United States, Canada, Latin America (3)
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- G Geography. Anthropology. Recreation (116)
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- H Social Sciences (6585)
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- J Political Science (556)
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- K Law (3798)
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- L Education (394)
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- M Music and Books on Music (1)
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- N Fine Arts (75)
  - N Visual arts (General) For photography, see TR (12)
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- P Language and Literature (2046)
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- Q Science (4826)
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- R Medicine (8573)
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  - RK Dentistry (755)
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  - RV Botanic, Thomsonian, and eclectic medicine (16)
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  - RZ Other systems of medicine (48)
- S Agriculture (6262)
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  - SH Aquaculture. Fisheries. Angling (860)
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- T Technology (3962)
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  - TA Engineering (General). Civil engineering (General) (1007)
  - TC Hydraulic engineering. Ocean engineering (69)
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  - TH Building construction (31)
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  - TK Electrical engineering. Electronics Nuclear engineering (412)
  - TL Motor vehicles. Aeronautics. Astronautics (6)
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  - TP Chemical technology (24)
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  - TX Home economics (23)
- U Military Science (2)
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- V Naval Science (394)
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  - VM Naval architecture. Shipbuilding. Marine engineering (272)
- Z Bibliography. Library Science. Information Resources (3)
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