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Library of Congress Subject Areas (4181)
- A General Works (39)
  - AC Collections. Series. Collected works (17)
  - AI Indexes (General) (1)
  - AM Museums (General). Collectors and collecting (General) (8)
  - AS Academies and learned societies (General) (15)
  - AZ History of Scholarship The Humanities (5)
- B Philosophy. Psychology. Religion (117)
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- D History General and Old World (66)
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- E History America (10)
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- F History United States, Canada, Latin America (4)
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- G Geography. Anthropology. Recreation (68)
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- H Social Sciences (1031)
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- J Political Science (46)
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- K Law (58)
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- L Education (979)
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  - LG Individual institutions (Asia. Africa) (9)
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- M Music and Books on Music (647)
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- N Fine Arts (680)
  - N Visual arts (General) For photography, see TR (421)
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- P Language and Literature (225)
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- Q Science (490)
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- R Medicine (330)
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- S Agriculture (43)
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  - SH Aquaculture. Fisheries. Angling (3)
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- T Technology (593)
  - T Technology (General) (204)
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  - TA Engineering (General). Civil engineering (General) (63)
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  - TK Electrical engineering. Electronics Nuclear engineering (47)
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  - TR Photography (260)
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  - TX Home economics (4)
- U Military Science (2)
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- Z Bibliography. Library Science. Information Resources (45)
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  - Z719 Libraries (General) (16)
  - ZA Information resources (21)
    - ZA4050 Electronic information resources (15)
    - ZA4450 Databases (3)