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Library of Congress Subject Areas (4148)
- A General Works (38)
  - AC Collections. Series. Collected works (17)
  - AI Indexes (General) (1)
  - AM Museums (General). Collectors and collecting (General) (8)
  - AS Academies and learned societies (General) (14)
  - AZ History of Scholarship The Humanities (5)
- B Philosophy. Psychology. Religion (117)
  - B Philosophy (General) (34)
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- D History General and Old World (66)
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    - D839 Post-war History, 1945 on (3)
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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 (1027)
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- J Political Science (46)
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- K Law (58)
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- L Education (972)
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  - LG Individual institutions (Asia. Africa) (9)
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- M Music and Books on Music (646)
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- N Fine Arts (679)
  - N Visual arts (General) For photography, see TR (420)
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- P Language and Literature (225)
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- Q Science (484)
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- R Medicine (325)
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- S Agriculture (43)
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  - SH Aquaculture. Fisheries. Angling (3)
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- T Technology (580)
  - T Technology (General) (196)
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  - TA Engineering (General). Civil engineering (General) (61)
  - TD Environmental technology. Sanitary engineering (12)
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  - TK Electrical engineering. Electronics Nuclear engineering (40)
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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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  - ZA Information resources (21)
    - ZA4050 Electronic information resources (15)
    - ZA4450 Databases (3)