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Library of Congress Subject Areas (24412)
- A General Works (28)
  - AC Collections. Series. Collected works (5)
  - AI Indexes (General) (5)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (17)
- B Philosophy. Psychology. Religion (882)
  - B Philosophy (General) (11)
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- C Auxiliary Sciences of History (9)
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- D History General and Old World (288)
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- E History America (1)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (1423)
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- H Social Sciences (10706)
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- J Political Science (1899)
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- K Law (970)
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- L Education (4028)
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- M Music and Books on Music (65)
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- N Fine Arts (81)
  - N Visual arts (General) For photography, see TR (42)
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- P Language and Literature (644)
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- Q Science (2980)
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- R Medicine (174)
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- S Agriculture (124)
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- T Technology (1923)
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  - TH Building construction (192)
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  - TK Electrical engineering. Electronics Nuclear engineering (209)
  - TL Motor vehicles. Aeronautics. Astronautics (17)
  - TP Chemical technology (1)
  - TR Photography (15)
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  - TX Home economics (32)
- U Military Science (42)
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- V Naval Science (2)
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  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (127)
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  - ZA Information resources (14)
    - ZA4050 Electronic information resources (9)
    - ZA4450 Databases (1)