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Library of Congress Subject Areas (3471)
- 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 (2026)
  - H Social Sciences (General) (1466)
  - HA Statistics (2)
  - 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)
  - HF Commerce (1)
  - HG Finance (48)
  - HH Accounting (2)
  - HI Communication Studies (7)
  - HJ Public Finance (24)
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  - HL Management (13)
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  - HN Social history and conditions. Social problems. Social reform (5)
  - HT Communities. Classes. Races (1)
  - HV Social pathology. Social and public welfare (5)
- J Political Science (5)
  - J General legislative and executive papers (2)
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- K Law (244)
  - K Law (General) (244)
- L Education (3)
  - L Education (General) (3)
- N Fine Arts (6)
  - N Visual arts (General) For photography, see TR (5)
  - NE Print media (6)
- P Language and Literature (2)
  - P Philology. Linguistics (2)
- Q Science (831)
  - Q Science (General) (826)
  - 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)
  - RC Internal medicine (1)
  - 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 (303)
  - 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)
  - TF Railroad engineering and operation (1)
  - TH Building construction (1)
  - TI Food Technology (15)
  - TM Industrial Engineering (6)
  - TP Chemical technology (88)
  - TS Manufactures (2)