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Library of Congress Subject Areas (3265)
- A General Works (33)
  - AC Collections. Series. Collected works (16)
  - AI Indexes (General) (1)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (13)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (114)
  - B Philosophy (General) (31)
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- D History General and Old World (67)
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    - D839 Post-war History, 1945 on (3)
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- E History America (6)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (49)
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- H Social Sciences (806)
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- J Political Science (45)
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- L Education (835)
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  - LG Individual institutions (Asia. Africa) (8)
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- M Music and Books on Music (477)
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- N Fine Arts (585)
  - N Visual arts (General) For photography, see TR (367)
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- P Language and Literature (175)
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    - P Philology. Linguistics (33)
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- Q Science (357)
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- R Medicine (243)
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- S Agriculture (45)
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  - SH Aquaculture. Fisheries. Angling (3)
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- T Technology (378)
  - T Technology (General) (87)
  - TA Engineering (General). Civil engineering (General) (21)
  - TD Environmental technology. Sanitary engineering (3)
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  - TK Electrical engineering. Electronics Nuclear engineering (19)
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  - TP Chemical technology (7)
  - TR Photography (229)
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  - TX Home economics (4)
- U Military Science (1)
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- Z Bibliography. Library Science. Information Resources (45)
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  - ZA Information resources (22)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (2)