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Library of Congress Subject Areas (434)
- L Education (417)
  - L Education (General) (417)
- Q Science (3)
  - Q Science (General) (3)
- R Medicine (109)
  - R Medicine (General) (109)
- T Technology (323)
  - T Technology (General) (322)
  - TA Engineering (General). Civil engineering (General) (41)
  - TH Building construction (1)