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Library of Congress Subject Areas (2453)
- B Philosophy. Psychology. Religion (18)
  - BF Psychology (18)
- C Auxiliary Sciences of History (2)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (1)
- H Social Sciences (1486)
  - H Social Sciences (General) (122)
  - HB Economic Theory (32)
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  - HV Social pathology. Social and public welfare (138)
  - HX Socialism. Communism. Anarchism (1)
- J Political Science (261)
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- K Law (208)
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- L Education (3)
  - L Education (General) (3)
- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- P Language and Literature (116)
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    - PN2000 Dramatic representation. The Theater (3)
  - PR English literature (29)
- Q Science (13)
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  - QA Mathematics (7)
    - QA75 Electronic computers. Computer science (2)
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  - QP Physiology (4)
- R Medicine (3)
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  - RA Public aspects of medicine (2)
    - RA0421 Public health. Hygiene. Preventive Medicine (2)
- S Agriculture (72)
  - S Agriculture (General) (43)
  - SB Plant culture (47)
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- T Technology (306)
  - T Technology (General) (164)
    - T201 Patents. Trademarks (79)
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