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Library of Congress Subject Areas (19)
- H Social Sciences (17)
  - H Social Sciences (General) (12)
  - HB Economic Theory (5)
  - HC Economic History and Conditions (5)
  - HN Social history and conditions. Social problems. Social reform (1)
- T Technology (2)
  - T Technology (General) (2)
  - TA Engineering (General). Civil engineering (General) (2)