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Library of Congress Subject Areas (15071)
- A General Works (6)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (1081)
  - B Philosophy (General) (85)
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    - BV1460 Religious Education (2)
- C Auxiliary Sciences of History (23)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (2)
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- D History General and Old World (229)
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    - D901 Europe (General) (6)
  - DA Great Britain (82)
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  - DE The Mediterranean Region. The Greco-Roman World (5)
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- E History America (14)
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- F History United States, Canada, Latin America (3)
  - F001 United States local history (2)
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- G Geography. Anthropology. Recreation (739)
  - G Geography (General) (56)
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- H Social Sciences (3317)
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- J Political Science (139)
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- K Law (559)
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- L Education (1054)
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  - LF Individual institutions (Europe) (1)
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- M Music and Books on Music (102)
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- N Fine Arts (574)
  - N Visual arts (General) For photography, see TR (199)
  - NA Architecture (300)
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  - NX Arts in general (85)
- P Language and Literature (738)
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  - PN Literature (General) (442)
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- Q Science (4098)
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  - QH Natural history (212)
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- R Medicine (1560)
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  - RA Public aspects of medicine (349)
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  - RB Pathology (12)
  - RC Internal medicine (210)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (52)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (29)
    - RC1200 Sports Medicine (55)
  - RD Surgery (10)
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    - RJ101 Child Health. Child health services (23)
  - RK Dentistry (54)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (175)
  - RS Pharmacy and materia medica (265)
  - RT Nursing (291)
  - RV Botanic, Thomsonian, and eclectic medicine (13)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (54)
- S Agriculture (1533)
  - S Agriculture (General) (1202)
  - SB Plant culture (491)
  - SD Forestry (45)
  - SF Animal culture (78)
  - SH Aquaculture. Fisheries. Angling (50)
- T Technology (2739)
  - T Technology (General) (589)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1039)
  - TC Hydraulic engineering. Ocean engineering (21)
  - TD Environmental technology. Sanitary engineering (211)
  - TE Highway engineering. Roads and pavements (9)
  - TF Railroad engineering and operation (14)
  - TG Bridge engineering (7)
  - TH Building construction (163)
  - TJ Mechanical engineering and machinery (145)
  - TK Electrical engineering. Electronics Nuclear engineering (567)
  - TL Motor vehicles. Aeronautics. Astronautics (94)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (150)
  - TR Photography (20)
  - TS Manufactures (135)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (19)
- U Military Science (10)
  - U Military Science (General) (10)
- V Naval Science (70)
  - V Naval Science (General) (20)
  - VM Naval architecture. Shipbuilding. Marine engineering (52)
- Z Bibliography. Library Science. Information Resources (105)
  - Z004 Books. Writing. Paleography (72)
  - Z665 Library Science. Information Science (17)
  - Z719 Libraries (General) (3)
  - ZA Information resources (16)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (2)