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Library of Congress Subject Areas (1392)
- A General Works (43)
  - AC Collections. Series. Collected works (22)
  - AI Indexes (General) (9)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (15)
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- B Philosophy. Psychology. Religion (4)
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    - BV1460 Religious Education (1)
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- C Auxiliary Sciences of History (3)
  - C Auxiliary sciences of history (General) (2)
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- D History General and Old World (1)
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- E History America (2)
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- F History United States, Canada, Latin America (3)
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- G Geography. Anthropology. Recreation (4)
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- H Social Sciences (572)
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  - HV Social pathology. Social and public welfare (29)
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- J Political Science (73)
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- L Education (295)
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- M Music and Books on Music (2)
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- N Fine Arts (2)
  - N Visual arts (General) For photography, see TR (1)
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- Q Science (62)
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- R Medicine (4)
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- S Agriculture (144)
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- T Technology (20)
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- U Military Science (1)
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- V Naval Science (15)
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  - VM Naval architecture. Shipbuilding. Marine engineering (2)
- Z Bibliography. Library Science. Information Resources (6)
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  - Z719 Libraries (General) (4)
  - ZA Information resources (5)
    - ZA4050 Electronic information resources (3)
    - ZA4450 Databases (4)