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Library of Congress Subject Areas (696)
- G Geography. Anthropology. Recreation (47)
  - G Geography (General) (33)
  - GE Environmental Sciences (14)
- H Social Sciences (239)
  - H Social Sciences (General) (236)
  - HB Economic Theory (1)
  - HF Commerce (1)
  - HG Finance (2)
- N Fine Arts (3)
  - N Visual arts (General) For photography, see TR (2)
  - NA Architecture (1)
- Q Science (60)
  - Q Science (General) (49)
  - QH Natural history (11)
    - QH301 Biology (11)
- R Medicine (2)
  - R Medicine (General) (2)
- S Agriculture (299)
  - S Agriculture (General) (299)
  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (1)
- T Technology (48)
  - T Technology (General) (33)
  - TA Engineering (General). Civil engineering (General) (2)
  - TD Environmental technology. Sanitary engineering (1)
  - TJ Mechanical engineering and machinery (11)
  - TL Motor vehicles. Aeronautics. Astronautics (1)