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Library of Congress Subject Areas (49)
- L Education (13)
  - L Education (General) (13)
- Q Science (10)
  - Q Science (General) (9)
  - QA Mathematics (1)
- R Medicine (1)
  - R Medicine (General) (1)
- S Agriculture (1)
  - S Agriculture (General) (1)
- T Technology (26)
  - T Technology (General) (20)
  - TA Engineering (General). Civil engineering (General) (2)
  - TD Environmental technology. Sanitary engineering (1)
  - TP Chemical technology (3)