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Library of Congress Subject Areas (9972)
- A General Works (44)
  - AC Collections. Series. Collected works (31)
  - AI Indexes (General) (4)
  - AM Museums (General). Collectors and collecting (General) (8)
  - AS Academies and learned societies (General) (1)
- B Philosophy. Psychology. Religion (582)
  - B Philosophy (General) (118)
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- C Auxiliary Sciences of History (63)
  - C Auxiliary sciences of history (General) (24)
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    - CD921 Archives (5)
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- D History General and Old World (136)
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- E History America (36)
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- F History United States, Canada, Latin America (88)
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- G Geography. Anthropology. Recreation (743)
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- H Social Sciences (3135)
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- K Law (580)
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- L Education (2585)
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- M Music and Books on Music (258)
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- N Fine Arts (804)
  - N Visual arts (General) For photography, see TR (104)
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- P Language and Literature (484)
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- Q Science (1939)
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- R Medicine (1440)
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    - RJ101 Child Health. Child health services (62)
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  - RT Nursing (264)
  - RV Botanic, Thomsonian, and eclectic medicine (6)
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  - RZ Other systems of medicine (112)
- S Agriculture (1140)
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  - SH Aquaculture. Fisheries. Angling (78)
- T Technology (1023)
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    - T201 Patents. Trademarks (4)
  - TA Engineering (General). Civil engineering (General) (63)
  - TC Hydraulic engineering. Ocean engineering (40)
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  - TH Building construction (27)
  - TJ Mechanical engineering and machinery (8)
  - TK Electrical engineering. Electronics Nuclear engineering (24)
  - TL Motor vehicles. Aeronautics. Astronautics (5)
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  - TR Photography (8)
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  - TX Home economics (10)
- U Military Science (8)
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- V Naval Science (36)
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  - VM Naval architecture. Shipbuilding. Marine engineering (17)
- Z Bibliography. Library Science. Information Resources (176)
  - Z004 Books. Writing. Paleography (3)
  - Z665 Library Science. Information Science (47)
  - Z719 Libraries (General) (15)
  - ZA Information resources (143)
    - ZA4050 Electronic information resources (66)
    - ZA4450 Databases (17)