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Library of Congress Subject Areas (257)
- G Geography. Anthropology. Recreation (14)
  - GE Environmental Sciences (14)
- H Social Sciences (101)
  - H Social Sciences (General) (100)
  - HB Economic Theory (1)
- Q Science (12)
  - Q Science (General) (1)
  - QH Natural history (11)
    - QH301 Biology (11)
- R Medicine (2)
  - R Medicine (General) (2)
- S Agriculture (114)
  - S Agriculture (General) (114)
- T Technology (16)
  - T Technology (General) (2)
  - TA Engineering (General). Civil engineering (General) (2)
  - TD Environmental technology. Sanitary engineering (1)
  - TJ Mechanical engineering and machinery (11)