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Library of Congress Subject Areas (18713)
- A General Works (188)
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  - AM Museums (General). Collectors and collecting (General) (4)
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- B Philosophy. Psychology. Religion (229)
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- C Auxiliary Sciences of History (17)
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- D History General and Old World (27)
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- E History America (25)
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- F History United States, Canada, Latin America (5)
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- G Geography. Anthropology. Recreation (73)
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- H Social Sciences (7225)
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- M Music and Books on Music (40)
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- N Fine Arts (64)
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- Q Science (2267)
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- R Medicine (4651)
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- S Agriculture (69)
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- T Technology (1723)
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  - TK Electrical engineering. Electronics Nuclear engineering (84)
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- U Military Science (78)
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- V Naval Science (195)
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  - VM Naval architecture. Shipbuilding. Marine engineering (159)
- Z Bibliography. Library Science. Information Resources (328)
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  - ZA Information resources (119)
    - ZA4050 Electronic information resources (64)
    - ZA4450 Databases (45)