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Library of Congress Subject Areas (18001)
- A General Works (11)
  - AC Collections. Series. Collected works (3)
  - AI Indexes (General) (4)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (2)
- B Philosophy. Psychology. Religion (2242)
  - B Philosophy (General) (379)
  - BC Logic (1)
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  - BL Religion (63)
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- C Auxiliary Sciences of History (49)
  - C Auxiliary sciences of history (General) (2)
  - CC Archaeology (9)
  - CD Diplomatics. Archives. Seals (30)
    - CD921 Archives (30)
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- D History General and Old World (637)
  - D History (General) (458)
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  - DA Great Britain (193)
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- E History America (71)
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- F History United States, Canada, Latin America (68)
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- G Geography. Anthropology. Recreation (450)
  - G Geography (General) (25)
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    - GV557 Sport (23)
- H Social Sciences (6417)
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  - HV Social pathology. Social and public welfare (57)
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- J Political Science (1692)
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  - JV Colonies and colonization. Emigration and immigration. International migration (117)
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- K Law (1134)
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- L Education (349)
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- M Music and Books on Music (24)
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- N Fine Arts (236)
  - N Visual arts (General) For photography, see TR (73)
  - NA Architecture (26)
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  - NX Arts in general (113)
- P Language and Literature (1448)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (12)
  - PN Literature (General) (397)
    - PN0080 Criticism (54)
    - PN0441 Literary History (25)
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  - PQ Romance literatures (4)
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- Q Science (4391)
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- R Medicine (1552)
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  - RA Public aspects of medicine (243)
    - RA0421 Public health. Hygiene. Preventive Medicine (104)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (8)
    - RA790 Mental Health (116)
  - RB Pathology (9)
  - RC Internal medicine (652)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (134)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (212)
    - RC0500 Psychoanalysis (138)
    - RC1200 Sports Medicine (163)
  - RD Surgery (4)
  - RE Ophthalmology (69)
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  - RG Gynecology and obstetrics (21)
  - RJ Pediatrics (41)
    - RJ101 Child Health. Child health services (35)
  - RK Dentistry (4)
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  - RM Therapeutics. Pharmacology (26)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (46)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (11)
- S Agriculture (80)
  - S Agriculture (General) (53)
  - SB Plant culture (6)
  - SD Forestry (3)
  - SF Animal culture (5)
  - SH Aquaculture. Fisheries. Angling (17)
- T Technology (373)
  - T Technology (General) (83)
  - TA Engineering (General). Civil engineering (General) (8)
  - TD Environmental technology. Sanitary engineering (3)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (251)
  - TL Motor vehicles. Aeronautics. Astronautics (9)
  - TR Photography (25)
  - TS Manufactures (1)
- U Military Science (30)
  - U Military Science (General) (30)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (201)
  - Z004 Books. Writing. Paleography (19)
  - Z665 Library Science. Information Science (8)
  - Z719 Libraries (General) (4)
  - ZA Information resources (90)
    - ZA4050 Electronic information resources (80)
    - ZA4450 Databases (6)
  - ZX OA Fund (books and chapters) (21)
  - ZZ OA Fund (articles) (62)