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Library of Congress Subject Areas (35)
- L Education (7)
  - L Education (General) (7)
- Q Science (6)
  - Q Science (General) (6)
- R Medicine (5)
  - R Medicine (General) (5)
- T Technology (17)
  - T Technology (General) (15)
  - TA Engineering (General). Civil engineering (General) (1)
  - TD Environmental technology. Sanitary engineering (1)