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Library of Congress Subject Areas (40182)
- A General Works (97)
  - AC Collections. Series. Collected works (53)
  - AI Indexes (General) (15)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (30)
- B Philosophy. Psychology. Religion (9)
  - B Philosophy (General) (1)
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  - BP Islam. Bahaism. Theosophy, etc (2)
- D History General and Old World (4)
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- E History America (4)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (220)
  - G Geography (General) (91)
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- H Social Sciences (16517)
  - H Social Sciences (General) (7125)
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    - HD28 Management. Industrial Management (2198)
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  - HQ The family. Marriage. Woman (23)
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  - HT Communities. Classes. Races (37)
  - HV Social pathology. Social and public welfare (28)
  - HX Socialism. Communism. Anarchism (8)
- J Political Science (1473)
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- K Law (15)
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- L Education (178)
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- M Music and Books on Music (4)
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- N Fine Arts (50)
  - N Visual arts (General) For photography, see TR (24)
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- Q Science (6971)
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- R Medicine (20)
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  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RZ Other systems of medicine (2)
- S Agriculture (3566)
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  - SH Aquaculture. Fisheries. Angling (16)
- T Technology (11082)
  - T Technology (General) (3924)
    - T201 Patents. Trademarks (34)
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  - TK Electrical engineering. Electronics Nuclear engineering (216)
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  - TP Chemical technology (980)
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  - TX Home economics (27)
- U Military Science (15)
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- Z Bibliography. Library Science. Information Resources (885)
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  - ZA Information resources (854)
    - ZA4050 Electronic information resources (114)
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