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Library of Congress Subject Areas (22751)
- A General Works (15)
  - AC Collections. Series. Collected works (7)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (6)
- B Philosophy. Psychology. Religion (2231)
  - B Philosophy (General) (153)
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    - BV1460 Religious Education (4)
- C Auxiliary Sciences of History (31)
  - C Auxiliary sciences of history (General) (6)
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- D History General and Old World (301)
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- E History America (15)
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- F History United States, Canada, Latin America (6)
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- G Geography. Anthropology. Recreation (1427)
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- H Social Sciences (6525)
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- L Education (2070)
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- M Music and Books on Music (210)
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- N Fine Arts (1088)
  - N Visual arts (General) For photography, see TR (517)
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- P Language and Literature (980)
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- Q Science (6235)
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- R Medicine (2848)
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  - RK Dentistry (65)
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  - RS Pharmacy and materia medica (325)
  - RT Nursing (445)
  - RV Botanic, Thomsonian, and eclectic medicine (29)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (69)
- S Agriculture (2394)
  - S Agriculture (General) (1984)
  - SB Plant culture (578)
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- T Technology (3828)
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    - T201 Patents. Trademarks (5)
  - TA Engineering (General). Civil engineering (General) (1168)
  - TC Hydraulic engineering. Ocean engineering (31)
  - TD Environmental technology. Sanitary engineering (253)
  - TE Highway engineering. Roads and pavements (13)
  - TF Railroad engineering and operation (15)
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  - TH Building construction (282)
  - TJ Mechanical engineering and machinery (262)
  - TK Electrical engineering. Electronics Nuclear engineering (670)
  - TL Motor vehicles. Aeronautics. Astronautics (106)
  - TN Mining engineering. Metallurgy (97)
  - TP Chemical technology (206)
  - TR Photography (39)
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  - TX Home economics (21)
- U Military Science (18)
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- V Naval Science (75)
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  - VM Naval architecture. Shipbuilding. Marine engineering (54)
- Z Bibliography. Library Science. Information Resources (174)
  - Z004 Books. Writing. Paleography (76)
  - Z665 Library Science. Information Science (32)
  - Z719 Libraries (General) (8)
  - ZA Information resources (62)
    - ZA4050 Electronic information resources (18)
    - ZA4450 Databases (6)