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Library of Congress Subject Areas (32364)
- A General Works (74)
  - AC Collections. Series. Collected works (48)
  - AI Indexes (General) (12)
  - AS Academies and learned societies (General) (14)
- B Philosophy. Psychology. Religion (3)
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- D History General and Old World (1)
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- E History America (1)
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- G Geography. Anthropology. Recreation (127)
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- H Social Sciences (13260)
  - H Social Sciences (General) (5776)
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- J Political Science (1235)
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  - JV Colonies and colonization. Emigration and immigration. International migration (7)
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- L Education (139)
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- M Music and Books on Music (2)
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- N Fine Arts (46)
  - N Visual arts (General) For photography, see TR (22)
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- P Language and Literature (3)
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- Q Science (5779)
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- S Agriculture (2427)
  - S Agriculture (General) (2173)
  - SB Plant culture (273)
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  - SH Aquaculture. Fisheries. Angling (9)
- T Technology (8947)
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    - T201 Patents. Trademarks (27)
  - TA Engineering (General). Civil engineering (General) (2162)
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- U Military Science (12)
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- Z Bibliography. Library Science. Information Resources (733)
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