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Library of Congress Subject Areas (23555)
- A General Works (16)
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  - AM Museums (General). Collectors and collecting (General) (1)
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- B Philosophy. Psychology. Religion (2322)
  - B Philosophy (General) (153)
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- C Auxiliary Sciences of History (32)
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- D History General and Old World (309)
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- E History America (18)
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- F History United States, Canada, Latin America (6)
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- G Geography. Anthropology. Recreation (1494)
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- M Music and Books on Music (224)
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- Q Science (6521)
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- R Medicine (2999)
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- S Agriculture (2471)
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- T Technology (3947)
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  - TH Building construction (288)
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  - TK Electrical engineering. Electronics Nuclear engineering (674)
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- U Military Science (25)
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- V Naval Science (75)
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- Z Bibliography. Library Science. Information Resources (180)
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  - ZA Information resources (64)
    - ZA4050 Electronic information resources (18)
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