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Library of Congress Subject Areas (15559)
- A General Works (277)
  - AC Collections. Series. Collected works (65)
  - AI Indexes (General) (56)
  - AM Museums (General). Collectors and collecting (General) (13)
  - AS Academies and learned societies (General) (163)
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- B Philosophy. Psychology. Religion (217)
  - B Philosophy (General) (35)
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- C Auxiliary Sciences of History (28)
  - C Auxiliary sciences of history (General) (5)
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- D History General and Old World (76)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (213)
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- L Education (8249)
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- M Music and Books on Music (16)
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- N Fine Arts (301)
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- R Medicine (605)
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- S Agriculture (115)
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- T Technology (1473)
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  - TK Electrical engineering. Electronics Nuclear engineering (113)
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  - TR Photography (52)
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  - TX Home economics (44)
- U Military Science (6)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (132)
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  - Z665 Library Science. Information Science (52)
  - Z719 Libraries (General) (47)
  - ZA Information resources (48)
    - ZA4050 Electronic information resources (19)
    - ZA4450 Databases (14)