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Library of Congress Subject Areas (6498)
- A General Works (58)
  - AC Collections. Series. Collected works (1)
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  - AM Museums (General). Collectors and collecting (General) (24)
  - AS Academies and learned societies (General) (33)
- B Philosophy. Psychology. Religion (1096)
  - B Philosophy (General) (154)
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- C Auxiliary Sciences of History (16)
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- D History General and Old World (9)
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- G Geography. Anthropology. Recreation (390)
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- H Social Sciences (2264)
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- M Music and Books on Music (51)
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- N Fine Arts (661)
  - N Visual arts (General) For photography, see TR (29)
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- Q Science (2343)
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- R Medicine (839)
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- S Agriculture (137)
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- T Technology (842)
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  - TR Photography (3)
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- Z Bibliography. Library Science. Information Resources (527)
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  - ZA Information resources (511)
    - ZA4050 Electronic information resources (184)
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