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Library of Congress Subject Areas (16606)
- A General Works (9)
  - AC Collections. Series. Collected works (1)
  - AI Indexes (General) (3)
  - 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 (1963)
  - B Philosophy (General) (329)
  - BC Logic (1)
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  - BJ Ethics (37)
  - BL Religion (53)
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  - BT Doctrinal Theology (2)
  - BV Practical Theology (2)
  - BX Christian Denominations (1)
- C Auxiliary Sciences of History (41)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (1)
  - CC Archaeology (9)
  - CD Diplomatics. Archives. Seals (22)
    - CD921 Archives (22)
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- D History General and Old World (599)
  - D History (General) (439)
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    - D839 Post-war History, 1945 on (27)
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    - D901 Europe (General) (6)
  - DA Great Britain (167)
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- E History America (66)
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- F History United States, Canada, Latin America (60)
  - F001 United States local history (8)
  - F1001 Canada (General) (2)
  - F1201 Latin America (General) (52)
- G Geography. Anthropology. Recreation (410)
  - G Geography (General) (24)
  - GA Mathematical geography. Cartography (2)
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  - GE Environmental Sciences (227)
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  - GV Recreation Leisure (71)
    - GV557 Sport (19)
- H Social Sciences (6002)
  - H Social Sciences (General) (1741)
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  - HD Industries. Land use. Labor (661)
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  - HV Social pathology. Social and public welfare (45)
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  - HQ The family. Marriage. Women (186)
- J Political Science (1578)
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  - JV Colonies and colonization. Emigration and immigration. International migration (108)
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- K Law (1068)
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- L Education (275)
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- M Music and Books on Music (24)
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- N Fine Arts (201)
  - N Visual arts (General) For photography, see TR (57)
  - NA Architecture (22)
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  - NX Arts in general (97)
- P Language and Literature (1360)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (9)
  - PN Literature (General) (366)
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    - PN2000 Dramatic representation. The Theater (68)
  - PQ Romance literatures (3)
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- Q Science (4080)
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  - QC Physics (151)
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  - QH Natural history (1138)
    - QH301 Biology (875)
    - QH426 Genetics (283)
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- R Medicine (1447)
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  - RA Public aspects of medicine (221)
    - RA0421 Public health. Hygiene. Preventive Medicine (98)
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    - RA790 Mental Health (99)
  - RB Pathology (8)
  - RC Internal medicine (609)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (126)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (191)
    - RC0500 Psychoanalysis (127)
    - RC1200 Sports Medicine (160)
  - RD Surgery (4)
  - RE Ophthalmology (69)
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  - RG Gynecology and obstetrics (20)
  - RJ Pediatrics (36)
    - RJ101 Child Health. Child health services (30)
  - RK Dentistry (4)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (18)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (39)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (5)
- S Agriculture (68)
  - S Agriculture (General) (45)
  - SB Plant culture (6)
  - SD Forestry (3)
  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (15)
- T Technology (327)
  - T Technology (General) (58)
  - TA Engineering (General). Civil engineering (General) (5)
  - TD Environmental technology. Sanitary engineering (2)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (236)
  - TL Motor vehicles. Aeronautics. Astronautics (9)
  - TR Photography (21)
- U Military Science (23)
  - U Military Science (General) (23)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (90)
  - Z004 Books. Writing. Paleography (18)
  - Z665 Library Science. Information Science (7)
  - Z719 Libraries (General) (2)
  - ZA Information resources (66)
    - ZA4050 Electronic information resources (56)
    - ZA4450 Databases (5)