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Library of Congress Subject Areas (23942)
- A General Works (278)
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  - AM Museums (General). Collectors and collecting (General) (7)
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- B Philosophy. Psychology. Religion (280)
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- C Auxiliary Sciences of History (22)
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- D History General and Old World (42)
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- G Geography. Anthropology. Recreation (108)
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- L Education (1080)
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- M Music and Books on Music (59)
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- N Fine Arts (77)
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- Q Science (3141)
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- R Medicine (5884)
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- S Agriculture (100)
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- T Technology (2352)
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  - TX Home economics (62)
- U Military Science (95)
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- V Naval Science (266)
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  - VM Naval architecture. Shipbuilding. Marine engineering (219)
- Z Bibliography. Library Science. Information Resources (406)
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  - ZA Information resources (165)
    - ZA4050 Electronic information resources (84)
    - ZA4450 Databases (66)