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Library of Congress Subject Areas (39906)
- A General Works (88)
  - AC Collections. Series. Collected works (49)
  - AI Indexes (General) (15)
  - AS Academies and learned societies (General) (25)
- B Philosophy. Psychology. Religion (7)
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- D History General and Old World (3)
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- E History America (2)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (218)
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- H Social Sciences (16404)
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  - HT Communities. Classes. Races (31)
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- J Political Science (1463)
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- K Law (14)
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- L Education (168)
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- M Music and Books on Music (3)
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- N Fine Arts (49)
  - N Visual arts (General) For photography, see TR (24)
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- Q Science (6943)
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- R Medicine (19)
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- S Agriculture (3535)
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- T Technology (10981)
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- U Military Science (12)
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- Z Bibliography. Library Science. Information Resources (884)
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  - ZA Information resources (854)
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