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Library of Congress Subject Areas (71)
- H Social Sciences (12)
  - H Social Sciences (General) (11)
  - HB Economic Theory (1)
- J Political Science (5)
  - JA Political science (General) (5)
  - JC Political theory (1)
  - JS Local government Municipal government (1)
- K Law (3)
  - K Law (General) (3)
  - KZ Law of Nations (2)
- L Education (1)
  - L Education (General) (1)
- S Agriculture (2)
  - S Agriculture (General) (2)
- T Technology (49)
  - T Technology (General) (7)
  - TA Engineering (General). Civil engineering (General) (42)