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Library of Congress Subject Areas (17201)
- A General Works (332)
  - AC Collections. Series. Collected works (83)
  - AI Indexes (General) (75)
  - AM Museums (General). Collectors and collecting (General) (15)
  - AS Academies and learned societies (General) (182)
  - AZ History of Scholarship The Humanities (31)
- B Philosophy. Psychology. Religion (235)
  - B Philosophy (General) (43)
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    - BV1460 Religious Education (5)
- C Auxiliary Sciences of History (28)
  - C Auxiliary sciences of history (General) (5)
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- D History General and Old World (83)
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- E History America (1)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (249)
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- H Social Sciences (4600)
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- L Education (9054)
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- M Music and Books on Music (17)
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- N Fine Arts (332)
  - N Visual arts (General) For photography, see TR (92)
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- P Language and Literature (979)
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- Q Science (1658)
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- R Medicine (759)
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  - RL Dermatology (15)
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  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RZ Other systems of medicine (67)
- S Agriculture (143)
  - S Agriculture (General) (63)
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  - SH Aquaculture. Fisheries. Angling (68)
  - SK Hunting sports (3)
- T Technology (1762)
  - T Technology (General) (1320)
    - T201 Patents. Trademarks (16)
  - TA Engineering (General). Civil engineering (General) (111)
  - TC Hydraulic engineering. Ocean engineering (4)
  - TD Environmental technology. Sanitary engineering (19)
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  - TH Building construction (12)
  - TJ Mechanical engineering and machinery (99)
  - TK Electrical engineering. Electronics Nuclear engineering (127)
  - TL Motor vehicles. Aeronautics. Astronautics (25)
  - TN Mining engineering. Metallurgy (25)
  - TP Chemical technology (23)
  - TR Photography (55)
  - TS Manufactures (31)
  - TT Handicrafts Arts and crafts (39)
  - TX Home economics (58)
- U Military Science (6)
  - U Military Science (General) (6)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (143)
  - Z004 Books. Writing. Paleography (21)
  - Z665 Library Science. Information Science (59)
  - Z719 Libraries (General) (47)
  - ZA Information resources (50)
    - ZA4050 Electronic information resources (20)
    - ZA4450 Databases (15)