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Library of Congress Subject Areas (197)
- A General Works (52)
  - AI Indexes (General) (51)
  - AS Academies and learned societies (General) (1)
- H Social Sciences (37)
  - H Social Sciences (General) (10)
  - HA Statistics (1)
  - HB Economic Theory (10)
  - HC Economic History and Conditions (1)
  - HD Industries. Land use. Labor (1)
  - HF Commerce (13)
  - HG Finance (1)
- K Law (3)
  - K Law (General) (3)
- L Education (12)
  - L Education (General) (12)
- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- Q Science (2)
  - Q Science (General) (2)
- S Agriculture (2)
  - S Agriculture (General) (2)
- T Technology (88)
  - T Technology (General) (88)
  - TR Photography (1)