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Library of Congress Subject Areas (4197)
- A General Works (39)
  - AC Collections. Series. Collected works (17)
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  - AM Museums (General). Collectors and collecting (General) (8)
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  - AZ History of Scholarship The Humanities (5)
- B Philosophy. Psychology. Religion (116)
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- D History General and Old World (66)
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- E History America (10)
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- F History United States, Canada, Latin America (4)
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- G Geography. Anthropology. Recreation (68)
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- H Social Sciences (1031)
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- J Political Science (46)
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- L Education (984)
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- M Music and Books on Music (648)
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- N Fine Arts (680)
  - N Visual arts (General) For photography, see TR (421)
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- P Language and Literature (224)
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- Q Science (497)
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- R Medicine (330)
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- S Agriculture (43)
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- T Technology (601)
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  - TA Engineering (General). Civil engineering (General) (63)
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  - TR Photography (260)
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  - TX Home economics (4)
- U Military Science (2)
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- Z Bibliography. Library Science. Information Resources (45)
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  - ZA Information resources (21)
    - ZA4050 Electronic information resources (15)
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