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Library of Congress Subject Areas (133)
- A General Works (46)
  - AC Collections. Series. Collected works (27)
  - AI Indexes (General) (46)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (54)
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- B Philosophy. Psychology. Religion (3)
  - B Philosophy (General) (27)
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    - BV1460 Religious Education (6)
- C Auxiliary Sciences of History (6)
  - C Auxiliary sciences of history (General) (2)
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- D History General and Old World (3)
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- E History America (8)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (11)
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- H Social Sciences (87)
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- J Political Science (24)
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- L Education (133)
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  - LD Individual institutions (United States) (2)
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- M Music and Books on Music (5)
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- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (12)
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- P Language and Literature (23)
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- Q Science (22)
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- R Medicine (332)
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  - RB Pathology (15)
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    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1)
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  - RM Therapeutics. Pharmacology (28)
  - RS Pharmacy and materia medica (96)
  - RT Nursing (332)
  - RV Botanic, Thomsonian, and eclectic medicine (5)
  - RZ Other systems of medicine (29)
- S Agriculture (222)
  - S Agriculture (General) (222)
  - SB Plant culture (37)
  - SD Forestry (66)
  - SF Animal culture (93)
  - SH Aquaculture. Fisheries. Angling (26)
- T Technology (25)
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    - T201 Patents. Trademarks (18)
  - TA Engineering (General). Civil engineering (General) (190)
  - TC Hydraulic engineering. Ocean engineering (11)
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  - TF Railroad engineering and operation (7)
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  - TH Building construction (35)
  - TJ Mechanical engineering and machinery (69)
  - TK Electrical engineering. Electronics Nuclear engineering (202)
  - TL Motor vehicles. Aeronautics. Astronautics (6)
  - TN Mining engineering. Metallurgy (1)
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  - TX Home economics (8)
- U Military Science (22)
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- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (29)
  - Z004 Books. Writing. Paleography (8)
  - Z665 Library Science. Information Science (28)
  - Z719 Libraries (General) (10)
  - ZA Information resources (29)
    - ZA4050 Electronic information resources (12)
    - ZA4450 Databases (7)