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Library of Congress Subject Areas (4111)
- A General Works (82)
  - AC Collections. Series. Collected works (58)
  - AI Indexes (General) (9)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (17)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (71)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (1)
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- E History America (1)
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- G Geography. Anthropology. Recreation (9)
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- H Social Sciences (39)
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  - HV Social pathology. Social and public welfare (2)
- K Law (17)
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- L Education (290)
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- M Music and Books on Music (3)
  - M Music (3)
- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- P Language and Literature (5)
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- Q Science (301)
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- R Medicine (3520)
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  - RA Public aspects of medicine (619)
    - RA0421 Public health. Hygiene. Preventive Medicine (563)
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  - RK Dentistry (896)
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  - RT Nursing (732)
  - RV Botanic, Thomsonian, and eclectic medicine (5)
  - RX Homeopathy (6)
  - RZ Other systems of medicine (65)
- S Agriculture (11)
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- T Technology (63)
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  - TD Environmental technology. Sanitary engineering (39)
  - TP Chemical technology (16)
  - TR Photography (2)
- Z Bibliography. Library Science. Information Resources (103)
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  - Z719 Libraries (General) (51)
  - ZA Information resources (42)
    - ZA4050 Electronic information resources (1)
    - ZA4450 Databases (37)