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Library of Congress Subject Areas (17064)
- 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 (2021)
  - B Philosophy (General) (343)
  - BC Logic (1)
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  - BF Psychology (1607)
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  - BL Religion (54)
  - BM Judaism (3)
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  - BT Doctrinal Theology (2)
  - BV Practical Theology (2)
  - BX Christian Denominations (1)
- C Auxiliary Sciences of History (49)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (1)
  - CC Archaeology (9)
  - CD Diplomatics. Archives. Seals (30)
    - CD921 Archives (30)
  - CS Genealogy (1)
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- D History General and Old World (610)
  - D History (General) (446)
    - D051 Ancient History (2)
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    - D839 Post-war History, 1945 on (30)
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    - D901 Europe (General) (7)
  - DA Great Britain (173)
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- E History America (67)
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- F History United States, Canada, Latin America (60)
  - F001 United States local history (8)
  - F1001 Canada (General) (2)
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- G Geography. Anthropology. Recreation (431)
  - G Geography (General) (24)
  - GA Mathematical geography. Cartography (2)
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  - GC Oceanography (95)
  - GE Environmental Sciences (235)
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  - GT Manners and customs (6)
  - GV Recreation Leisure (74)
    - GV557 Sport (21)
- H Social Sciences (6130)
  - H Social Sciences (General) (1784)
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  - HB Economic Theory (1810)
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  - HD Industries. Land use. Labor (673)
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  - HV Social pathology. Social and public welfare (45)
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- J Political Science (1613)
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  - JV Colonies and colonization. Emigration and immigration. International migration (109)
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- K Law (1088)
  - K Law (General) (995)
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- L Education (285)
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- M Music and Books on Music (24)
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- N Fine Arts (216)
  - N Visual arts (General) For photography, see TR (63)
  - NA Architecture (23)
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  - NX Arts in general (105)
- P Language and Literature (1390)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (11)
  - PN Literature (General) (381)
    - PN0080 Criticism (49)
    - PN0441 Literary History (23)
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    - PN1993 Motion Pictures (75)
    - PN2000 Dramatic representation. The Theater (72)
  - PQ Romance literatures (3)
  - PR English literature (90)
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- Q Science (4200)
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  - QA Mathematics (2656)
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  - QC Physics (152)
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  - QH Natural history (1156)
    - QH301 Biology (890)
    - QH426 Genetics (288)
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- R Medicine (1515)
  - R Medicine (General) (489)
  - RA Public aspects of medicine (231)
    - RA0421 Public health. Hygiene. Preventive Medicine (101)
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    - RA790 Mental Health (106)
  - RB Pathology (8)
  - RC Internal medicine (638)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (130)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (210)
    - RC0500 Psychoanalysis (131)
    - RC1200 Sports Medicine (162)
  - RD Surgery (4)
  - RE Ophthalmology (69)
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  - RG Gynecology and obstetrics (21)
  - RJ Pediatrics (36)
    - RJ101 Child Health. Child health services (30)
  - RK Dentistry (4)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (21)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (42)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (7)
- S Agriculture (73)
  - S Agriculture (General) (50)
  - SB Plant culture (6)
  - SD Forestry (3)
  - SF Animal culture (2)
  - SH Aquaculture. Fisheries. Angling (15)
- T Technology (334)
  - T Technology (General) (60)
  - TA Engineering (General). Civil engineering (General) (5)
  - 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 (239)
  - TL Motor vehicles. Aeronautics. Astronautics (9)
  - TR Photography (22)
- U Military Science (23)
  - U Military Science (General) (23)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (113)
  - Z004 Books. Writing. Paleography (18)
  - Z665 Library Science. Information Science (7)
  - Z719 Libraries (General) (2)
  - ZA Information resources (89)
    - ZA4050 Electronic information resources (79)
    - ZA4450 Databases (5)