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Library of Congress Subject Areas (3614)
- 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 (2102)
  - H Social Sciences (General) (1540)
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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)
- J Political Science (5)
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- K Law (260)
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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 (883)
  - Q Science (General) (878)
  - QD Chemistry (5)
  - QK Botany (6)
- R Medicine (40)
  - R Medicine (General) (24)
  - RA Public aspects of medicine (18)
    - RA0421 Public health. Hygiene. Preventive Medicine (10)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (5)
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  - RS Pharmacy and materia medica (5)
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  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RZ Other systems of medicine (6)
- S Agriculture (6)
  - S Agriculture (General) (5)
  - SB Plant culture (1)
- Technology (302)
  - T Technology (General) (27)
  - TA Engineering (General). Civil engineering (General) (25)
  - TB Environmental Engineering (9)
  - TC Hydraulic engineering. Ocean engineering (4)
  - TD Environmental technology. Sanitary engineering (134)
  - TE Highway engineering. Roads and pavements (2)
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  - TI Food Technology (15)
  - TM Industrial Engineering (6)
  - TP Chemical technology (87)
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