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Library of Congress Subject Areas (16750)
- A General Works (6)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (1281)
  - B Philosophy (General) (95)
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    - BV1460 Religious Education (3)
- C Auxiliary Sciences of History (23)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (2)
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- D History General and Old World (240)
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  - DA Great Britain (86)
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- E History America (14)
  - E11 America (General) (6)
  - E151 United States (General) (9)
- F History United States, Canada, Latin America (4)
  - F001 United States local history (2)
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- G Geography. Anthropology. Recreation (865)
  - G Geography (General) (58)
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- H Social Sciences (3762)
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- J Political Science (170)
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- K Law (689)
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- L Education (1277)
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    - LC5201 Education extension. Adult education. Continuing education (65)
  - LF Individual institutions (Europe) (1)
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- M Music and Books on Music (144)
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  - MT Musical instruction and study (19)
- N Fine Arts (624)
  - N Visual arts (General) For photography, see TR (228)
  - NA Architecture (318)
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  - NX Arts in general (88)
- P Language and Literature (765)
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  - PN Literature (General) (450)
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  - PQ Romance literatures (8)
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  - PZ Childrens literature (8)
- Q Science (4463)
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- R Medicine (1769)
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  - RA Public aspects of medicine (423)
    - RA0421 Public health. Hygiene. Preventive Medicine (279)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (21)
  - RC Internal medicine (235)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (59)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (41)
    - RC1200 Sports Medicine (61)
  - RD Surgery (13)
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  - RJ Pediatrics (48)
    - RJ101 Child Health. Child health services (30)
  - RK Dentistry (55)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (176)
  - RS Pharmacy and materia medica (272)
  - RT Nursing (338)
  - RV Botanic, Thomsonian, and eclectic medicine (19)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (56)
- S Agriculture (1756)
  - S Agriculture (General) (1396)
  - SB Plant culture (519)
  - SD Forestry (47)
  - SF Animal culture (87)
  - SH Aquaculture. Fisheries. Angling (62)
- T Technology (2875)
  - T Technology (General) (614)
    - T201 Patents. Trademarks (3)
  - TA Engineering (General). Civil engineering (General) (1098)
  - TC Hydraulic engineering. Ocean engineering (21)
  - TD Environmental technology. Sanitary engineering (221)
  - TE Highway engineering. Roads and pavements (10)
  - TF Railroad engineering and operation (14)
  - TG Bridge engineering (7)
  - TH Building construction (170)
  - TJ Mechanical engineering and machinery (153)
  - TK Electrical engineering. Electronics Nuclear engineering (579)
  - TL Motor vehicles. Aeronautics. Astronautics (97)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (156)
  - TR Photography (23)
  - TS Manufactures (138)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (21)
- U Military Science (10)
  - U Military Science (General) (10)
- V Naval Science (71)
  - V Naval Science (General) (21)
  - VM Naval architecture. Shipbuilding. Marine engineering (52)
- Z Bibliography. Library Science. Information Resources (120)
  - Z004 Books. Writing. Paleography (72)
  - Z665 Library Science. Information Science (20)
  - Z719 Libraries (General) (5)
  - ZA Information resources (27)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (5)