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Library of Congress Subject Areas (18077)
- 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 (2262)
  - B Philosophy (General) (379)
  - BC Logic (1)
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  - BF Psychology (1817)
  - BH Aesthetics (15)
  - BJ Ethics (39)
  - BL Religion (64)
  - BM Judaism (3)
  - BP Islam. Bahaism. Theosophy, etc (11)
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  - BS The Bible (1)
  - 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)
  - CC Archaeology (9)
  - CD Diplomatics. Archives. Seals (30)
    - CD921 Archives (30)
  - CS Genealogy (1)
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- D History General and Old World (639)
  - D History (General) (458)
    - D051 Ancient History (2)
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    - D204 Modern History (31)
    - D501 World War I (34)
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    - D839 Post-war History, 1945 on (32)
    - D890 Eastern Hemisphere (8)
    - D901 Europe (General) (8)
  - DA Great Britain (194)
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  - DE The Mediterranean Region. The Greco-Roman World (1)
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  - DS Asia (36)
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- E History America (71)
  - E11 America (General) (27)
  - E151 United States (General) (49)
- F History United States, Canada, Latin America (68)
  - F001 United States local history (11)
  - F1001 Canada (General) (2)
  - F1201 Latin America (General) (57)
- G Geography. Anthropology. Recreation (451)
  - G Geography (General) (25)
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  - GC Oceanography (97)
  - GE Environmental Sciences (242)
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  - GT Manners and customs (8)
  - GV Recreation Leisure (77)
    - GV557 Sport (23)
- H Social Sciences (6438)
  - H Social Sciences (General) (1956)
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  - HB Economic Theory (1836)
  - HC Economic History and Conditions (39)
  - HD Industries. Land use. Labor (690)
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    - HD58.7 Organizational behavior, change and effectiveness. Corporate culture (137)
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  - HN Social history and conditions. Social problems. Social reform (99)
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  - HT Communities. Classes. Races (108)
  - HV Social pathology. Social and public welfare (57)
  - HX Socialism. Communism. Anarchism (18)
  - HQ The family. Marriage. Women (219)
- J Political Science (1695)
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  - JA Political science (General) (981)
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    - JN101 Great Britain (78)
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  - JQ Political institutions Asia (21)
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  - JV Colonies and colonization. Emigration and immigration. International migration (118)
  - JX International law (314)
  - JZ International relations (206)
- K Law (1137)
  - K Law (General) (1035)
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- L Education (349)
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  - LD Individual institutions (United States) (1)
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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 (1451)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (12)
  - PN Literature (General) (398)
    - PN0080 Criticism (54)
    - PN0441 Literary History (25)
    - PN1990 Broadcasting (38)
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    - PN2000 Dramatic representation. The Theater (77)
  - PQ Romance literatures (4)
  - PR English literature (101)
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- Q Science (4399)
  - Q Science (General) (250)
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  - QC Physics (153)
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  - QH Natural history (1201)
    - QH301 Biology (928)
    - QH426 Genetics (302)
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  - QR Microbiology (110)
    - QR180 Immunology (6)
    - QR355 Virology (7)
- R Medicine (1558)
  - R Medicine (General) (498)
  - RA Public aspects of medicine (245)
    - RA0421 Public health. Hygiene. Preventive Medicine (104)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (8)
    - RA790 Mental Health (117)
  - RB Pathology (9)
  - RC Internal medicine (654)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (134)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (212)
    - RC0500 Psychoanalysis (139)
    - RC1200 Sports Medicine (164)
  - RD Surgery (4)
  - RE Ophthalmology (69)
  - RF Otorhinolaryngology (2)
  - RG Gynecology and obstetrics (21)
  - RJ Pediatrics (40)
    - RJ101 Child Health. Child health services (34)
  - RK Dentistry (4)
  - RL Dermatology (3)
  - RM Therapeutics. Pharmacology (27)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (49)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (14)
- S Agriculture (81)
  - S Agriculture (General) (54)
  - SB Plant culture (6)
  - SD Forestry (3)
  - SF Animal culture (5)
  - SH Aquaculture. Fisheries. Angling (17)
- T Technology (378)
  - T Technology (General) (85)
  - TA Engineering (General). Civil engineering (General) (8)
  - TD Environmental technology. Sanitary engineering (4)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (253)
  - 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 (224)
  - 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)
  - ZR Rights Retention (7)
  - ZX OA Fund (books and chapters) (25)
  - ZY UKRI funded books and chapters (1)
  - ZZ OA Fund (articles) (73)