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Library of Congress Subject Areas (1055)
- G Geography. Anthropology. Recreation (2)
  - G Geography (General) (2)
- H Social Sciences (1)
  - H Social Sciences (General) (1)
- L Education (6)
  - L Education (General) (6)
- Q Science (122)
  - Q Science (General) (92)
  - QA Mathematics (25)
    - QA75 Electronic computers. Computer science (21)
    - QA76 Computer software (1)
  - QD Chemistry (6)
  - QR Microbiology (3)
- R Medicine (1)
  - RZ Other systems of medicine (1)
- S Agriculture (87)
  - S Agriculture (General) (87)
- T Technology (1012)
  - T Technology (General) (90)
  - TA Engineering (General). Civil engineering (General) (4)
  - TD Environmental technology. Sanitary engineering (1)
  - TE Highway engineering. Roads and pavements (2)
  - TJ Mechanical engineering and machinery (6)
  - TK Electrical engineering. Electronics Nuclear engineering (911)