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Library of Congress Subject Areas (18693)
- A General Works (188)
  - AC Collections. Series. Collected works (56)
  - AI Indexes (General) (44)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (101)
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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 (7219)
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- L Education (803)
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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 (2266)
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- R Medicine (4647)
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- S Agriculture (69)
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- T Technology (1722)
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  - TA Engineering (General). Civil engineering (General) (480)
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  - TH Building construction (48)
  - TJ Mechanical engineering and machinery (319)
  - TK Electrical engineering. Electronics Nuclear engineering (84)
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  - TR Photography (13)
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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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  - Z665 Library Science. Information Science (96)
  - Z719 Libraries (General) (140)
  - ZA Information resources (119)
    - ZA4050 Electronic information resources (64)
    - ZA4450 Databases (45)