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Library of Congress Subject Areas (41397)
- A General Works (113)
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  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (39)
- B Philosophy. Psychology. Religion (16)
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- C Auxiliary Sciences of History (1)
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- D History General and Old World (7)
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- E History America (5)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (238)
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- H Social Sciences (17151)
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- J Political Science (1518)
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- M Music and Books on Music (4)
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- N Fine Arts (50)
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- Q Science (7179)
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- R Medicine (22)
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- S Agriculture (3681)
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- T Technology (11391)
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- U Military Science (17)
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- Z Bibliography. Library Science. Information Resources (892)
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  - ZA Information resources (857)
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    - ZA4450 Databases (433)