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Library of Congress Subject Areas (16932)
- A General Works (322)
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  - AM Museums (General). Collectors and collecting (General) (15)
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- B Philosophy. Psychology. Religion (233)
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- C Auxiliary Sciences of History (28)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (240)
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- M Music and Books on Music (17)
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- N Fine Arts (327)
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- Q Science (1622)
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- R Medicine (753)
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- S Agriculture (139)
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- T Technology (1726)
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  - TK Electrical engineering. Electronics Nuclear engineering (127)
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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 (142)
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  - ZA Information resources (50)
    - ZA4050 Electronic information resources (20)
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