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Library of Congress Subject Areas (16492)
- A General Works (311)
  - AC Collections. Series. Collected works (76)
  - AI Indexes (General) (64)
  - AM Museums (General). Collectors and collecting (General) (14)
  - AS Academies and learned societies (General) (178)
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- B Philosophy. Psychology. Religion (227)
  - B Philosophy (General) (40)
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- C Auxiliary Sciences of History (28)
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- D History General and Old World (78)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (230)
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- H Social Sciences (4520)
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- L Education (8696)
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- M Music and Books on Music (17)
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- N Fine Arts (322)
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- R Medicine (635)
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- S Agriculture (129)
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- T Technology (1653)
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  - TR Photography (54)
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- U Military Science (6)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (139)
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  - Z719 Libraries (General) (47)
  - ZA Information resources (49)
    - ZA4050 Electronic information resources (19)
    - ZA4450 Databases (15)