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Library of Congress Subject Areas (3128)
- B Philosophy. Psychology. Religion (130)
  - BF Psychology (128)
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- C Auxiliary Sciences of History (1)
  - CB History of civilization (1)
- D History General and Old World (7)
  - D History (General) (7)
- G Geography. Anthropology. Recreation (73)
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- H Social Sciences (967)
  - H Social Sciences (General) (437)
  - HB Economic Theory (98)
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  - HD Industries. Land use. Labor (6)
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- L Education (449)
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- M Music and Books on Music (7)
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- N Fine Arts (3)
  - N Visual arts (General) For photography, see TR (2)
  - NX Arts in general (1)
- P Language and Literature (769)
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- Q Science (565)
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- R Medicine (15)
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- S Agriculture (63)
  - S Agriculture (General) (58)
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  - SH Aquaculture. Fisheries. Angling (1)
- T Technology (202)
  - T Technology (General) (59)
  - TA Engineering (General). Civil engineering (General) (79)
  - TC Hydraulic engineering. Ocean engineering (2)
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- Z Bibliography. Library Science. Information Resources (95)
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