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Library of Congress Subject Areas (6225)
- A General Works (57)
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  - AI Indexes (General) (1)
  - AM Museums (General). Collectors and collecting (General) (23)
  - AS Academies and learned societies (General) (33)
- B Philosophy. Psychology. Religion (1036)
  - B Philosophy (General) (151)
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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 (370)
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- H Social Sciences (2156)
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- M Music and Books on Music (49)
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- N Fine Arts (602)
  - N Visual arts (General) For photography, see TR (28)
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- Q Science (2285)
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- R Medicine (828)
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- S Agriculture (134)
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- T Technology (820)
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  - TR Photography (3)
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- Z Bibliography. Library Science. Information Resources (523)
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  - ZA Information resources (509)
    - ZA4050 Electronic information resources (184)
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