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Library of Congress Subject Areas (3684)
- A General Works (34)
  - AC Collections. Series. Collected works (16)
  - AI Indexes (General) (1)
  - AM Museums (General). Collectors and collecting (General) (6)
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- B Philosophy. Psychology. Religion (114)
  - B Philosophy (General) (31)
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- D History General and Old World (67)
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- E History America (6)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (57)
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- H Social Sciences (1010)
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- J Political Science (45)
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- L Education (869)
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  - LG Individual institutions (Asia. Africa) (8)
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- M Music and Books on Music (527)
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- N Fine Arts (620)
  - N Visual arts (General) For photography, see TR (388)
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- P Language and Literature (193)
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- Q Science (392)
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- R Medicine (268)
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- S Agriculture (45)
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- T Technology (427)
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  - TR Photography (238)
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- U Military Science (1)
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- Z Bibliography. Library Science. Information Resources (45)
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  - ZA Information resources (22)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (2)