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Library of Congress Subject Areas (6213)
- A General Works (197)
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  - AI Indexes (General) (25)
  - AM Museums (General). Collectors and collecting (General) (3)
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- B Philosophy. Psychology. Religion (141)
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- C Auxiliary Sciences of History (9)
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- G Geography. Anthropology. Recreation (15)
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- K Law (17)
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- L Education (1050)
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- M Music and Books on Music (8)
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- Q Science (634)
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- R Medicine (5054)
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  - RA Public aspects of medicine (807)
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  - RM Therapeutics. Pharmacology (77)
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- S Agriculture (29)
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- T Technology (116)
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- Z Bibliography. Library Science. Information Resources (193)
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  - ZA Information resources (72)
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