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Library of Congress subjects (94691)
- A General Works (76)
  - AC Collections. Series. Collected works (30)
  - AM Museums (General). Collectors and collecting (General) (29)
  - AS Academies and learned societies (General) (3)
  - AZ History of Scholarship The Humanities (12)
- B Philosophy. Psychology. Religion (5573)
  - B Philosophy (General) (1750)
  - BC Logic (171)
  - BD Speculative Philosophy (57)
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  - BL Religion (665)
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  - BT Doctrinal Theology (7)
  - BV Practical Theology (7)
    - BV1460 Religious Education (2)
  - BX Christian Denominations (33)
- C Auxiliary Sciences of History (188)
  - C Auxiliary sciences of history (General) (14)
  - CB History of civilization (14)
  - CC Archaeology (13)
  - CD Diplomatics. Archives. Seals (16)
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- D History General and Old World (5403)
  - D History (General) (1788)
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    - D839 Post-war History, 1945 on (266)
    - D880 Developing Countries (24)
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  - DA Great Britain (749)
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- E History America (512)
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- F History United States, Canada, Latin America (404)
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- G Geography. Anthropology. Recreation (5447)
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- H Social Sciences (57154)
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  - HV Social pathology. Social and public welfare. Criminology (8505)
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- J Political Science (32719)
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- K Law (5672)
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- L Education (3232)
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- M Music and Books on Music (99)
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- N Fine Arts (457)
  - N Visual arts (General) For photography, see TR (109)
  - NA Architecture (118)
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  - NX Arts in general (119)
- P Language and Literature (3996)
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  - PN Literature (General) (3625)
    - PN0080 Criticism (89)
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- Q Science (4378)
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- R Medicine (9006)
  - R Medicine (General) (725)
  - RA Public aspects of medicine (7554)
    - RA0421 Public health. Hygiene. Preventive Medicine (4433)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (30)
  - RB Pathology (24)
  - RC Internal medicine (510)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (39)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (265)
    - RC1200 Sports Medicine (6)
  - RD Surgery (58)
  - RE Ophthalmology (12)
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  - RG Gynecology and obstetrics (204)
  - RJ Pediatrics (215)
    - RJ101 Child Health. Child health services (190)
  - RK Dentistry (3)
  - RM Therapeutics. Pharmacology (210)
  - RS Pharmacy and materia medica (227)
  - RT Nursing (43)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (7)
  - RZ Other systems of medicine (126)
- S Agriculture (336)
  - S Agriculture (General) (236)
  - SB Plant culture (11)
  - SD Forestry (30)
  - SF Animal culture (38)
  - SH Aquaculture. Fisheries. Angling (19)
  - SK Hunting sports (1)
- T Technology (3115)
  - T Technology (General) (2527)
    - T201 Patents. Trademarks (74)
  - TA Engineering (General). Civil engineering (General) (39)
  - TC Hydraulic engineering. Ocean engineering (14)
  - TD Environmental technology. Sanitary engineering (73)
  - TE Highway engineering. Roads and pavements (21)
  - TF Railroad engineering and operation (37)
  - TG Bridge engineering (1)
  - TH Building construction (46)
  - TJ Mechanical engineering and machinery (20)
  - TK Electrical engineering. Electronics Nuclear engineering (70)
  - TL Motor vehicles. Aeronautics. Astronautics (30)
  - TN Mining engineering. Metallurgy (33)
  - TP Chemical technology (22)
  - TR Photography (76)
  - TS Manufactures (17)
  - TT Handicrafts Arts and crafts (4)
  - TX Home economics (16)
- U Military Science (449)
  - U Military Science (General) (439)
- V Naval Science (11)
  - V Naval Science (General) (8)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (706)
  - Z004 Books. Writing. Paleography (145)
  - Z665 Library Science. Information Science (170)
  - Z719 Libraries (General) (86)
  - ZA Information resources (331)
    - ZA4050 Electronic information resources (186)
    - ZA4450 Databases (29)