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Library of Congress Subject Areas (3906)
- A General Works (35)
  - AC Collections. Series. Collected works (16)
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  - AM Museums (General). Collectors and collecting (General) (8)
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  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (115)
  - B Philosophy (General) (32)
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- D History General and Old World (66)
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- E History America (9)
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- F History United States, Canada, Latin America (3)
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- G Geography. Anthropology. Recreation (64)
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- H Social Sciences (1031)
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- J Political Science (46)
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- L Education (932)
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  - LG Individual institutions (Asia. Africa) (8)
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- M Music and Books on Music (566)
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- N Fine Arts (650)
  - N Visual arts (General) For photography, see TR (404)
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- P Language and Literature (209)
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- Q Science (466)
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- R Medicine (286)
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- S Agriculture (46)
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- T Technology (487)
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  - TR Photography (252)
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- U Military Science (1)
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- Z Bibliography. Library Science. Information Resources (47)
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  - ZA Information resources (23)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (3)