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Library of Congress Subject Areas (6776)
- A General Works (18)
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  - AS Academies and learned societies (General) (15)
- B Philosophy. Psychology. Religion (38)
  - B Philosophy (General) (5)
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- D History General and Old World (4)
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- G Geography. Anthropology. Recreation (28)
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- H Social Sciences (561)
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- L Education (230)
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- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
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- Q Science (1185)
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- S Agriculture (26)
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- T Technology (5005)
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  - TK Electrical engineering. Electronics Nuclear engineering (1770)
  - TL Motor vehicles. Aeronautics. Astronautics (185)
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- U Military Science (3)
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- Z Bibliography. Library Science. Information Resources (26)
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