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Library of Congress Subject Areas (13190)
- A General Works (7)
  - AC Collections. Series. Collected works (2)
  - 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 (860)
  - B Philosophy (General) (86)
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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 (216)
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  - DA Great Britain (75)
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- E History America (14)
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- F History United States, Canada, Latin America (3)
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- G Geography. Anthropology. Recreation (662)
  - G Geography (General) (53)
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- H Social Sciences (2802)
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- K Law (483)
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- L Education (951)
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  - LC Special aspects of education (137)
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  - LF Individual institutions (Europe) (1)
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- M Music and Books on Music (82)
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- N Fine Arts (500)
  - N Visual arts (General) For photography, see TR (164)
  - NA Architecture (279)
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  - NX Arts in general (68)
- P Language and Literature (707)
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  - PN Literature (General) (426)
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  - PQ Romance literatures (4)
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  - PZ Childrens literature (8)
- Q Science (3789)
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- R Medicine (1439)
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  - RA Public aspects of medicine (310)
    - RA0421 Public health. Hygiene. Preventive Medicine (174)
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  - RB Pathology (11)
  - RC Internal medicine (202)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (50)
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    - RC1200 Sports Medicine (50)
  - RD Surgery (9)
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    - RJ101 Child Health. Child health services (23)
  - RK Dentistry (54)
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  - RM Therapeutics. Pharmacology (171)
  - RS Pharmacy and materia medica (260)
  - RT Nursing (282)
  - RV Botanic, Thomsonian, and eclectic medicine (13)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (50)
- S Agriculture (1297)
  - S Agriculture (General) (988)
  - SB Plant culture (478)
  - SD Forestry (42)
  - SF Animal culture (67)
  - SH Aquaculture. Fisheries. Angling (47)
- T Technology (2504)
  - T Technology (General) (587)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (849)
  - TC Hydraulic engineering. Ocean engineering (20)
  - TD Environmental technology. Sanitary engineering (201)
  - TE Highway engineering. Roads and pavements (6)
  - TF Railroad engineering and operation (13)
  - TG Bridge engineering (7)
  - TH Building construction (142)
  - TJ Mechanical engineering and machinery (144)
  - TK Electrical engineering. Electronics Nuclear engineering (561)
  - TL Motor vehicles. Aeronautics. Astronautics (93)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (149)
  - TR Photography (18)
  - TS Manufactures (132)
  - 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 (104)
  - Z004 Books. Writing. Paleography (72)
  - Z665 Library Science. Information Science (16)
  - Z719 Libraries (General) (3)
  - ZA Information resources (16)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (2)