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Library of Congress Subject Areas (18976)
- A General Works (189)
  - AC Collections. Series. Collected works (56)
  - AI Indexes (General) (44)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (102)
  - AZ History of Scholarship The Humanities (3)
- 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 (76)
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- H Social Sciences (7255)
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- L Education (855)
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- M Music and Books on Music (41)
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- N Fine Arts (65)
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- Q Science (2317)
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- R Medicine (4829)
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- S Agriculture (70)
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- T Technology (1754)
  - T Technology (General) (761)
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  - TA Engineering (General). Civil engineering (General) (480)
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  - TH Building construction (48)
  - TJ Mechanical engineering and machinery (328)
  - TK Electrical engineering. Electronics Nuclear engineering (87)
  - TL Motor vehicles. Aeronautics. Astronautics (56)
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  - TR Photography (14)
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  - TX Home economics (51)
- 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 (330)
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  - Z719 Libraries (General) (141)
  - ZA Information resources (120)
    - ZA4050 Electronic information resources (65)
    - ZA4450 Databases (45)