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Library of Congress Subject Areas (3648)
- A General Works (1)
  - AC Collections. Series. Collected works (1)
- G Geography. Anthropology. Recreation (23)
  - G Geography (General) (11)
  - GE Environmental Sciences (12)
- H Social Science (2130)
  - H Social Sciences (General) (1550)
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  - HB Economic Theory (111)
  - HC Economic History and Conditions (161)
  - HD Industries. Land use. Labor (5)
    - HD28 Management. Industrial Management (3)
    - HD61 Risk Management (2)
  - HE Transportation and Communications (199)
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  - HV Social pathology. Social and public welfare (5)
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- K Law (261)
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- L Education (3)
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- N Fine Arts (6)
  - N Visual arts (General) For photography, see TR (5)
  - NE Print media (6)
- P Language and Literature (2)
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- Q Science (885)
  - Q Science (General) (880)
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- R Medicine (40)
  - R Medicine (General) (24)
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    - RA0421 Public health. Hygiene. Preventive Medicine (10)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (5)
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  - RZ Other systems of medicine (6)
- S Agriculture (6)
  - S Agriculture (General) (5)
  - SB Plant culture (1)
- Technology (305)
  - T Technology (General) (27)
  - TA Engineering (General). Civil engineering (General) (26)
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  - TC Hydraulic engineering. Ocean engineering (4)
  - TD Environmental technology. Sanitary engineering (134)
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  - TP Chemical technology (87)
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