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Library of Congress Subject Areas (15877)
- A General Works (7)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1696)
  - B Philosophy (General) (23)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (159)
  - D History (General) (31)
    - D111 Medieval History (1)
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    - D501 World War I (6)
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    - D839 Post-war History, 1945 on (5)
    - D901 Europe (General) (6)
  - DA Great Britain (33)
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  - DE The Mediterranean Region. The Greco-Roman World (6)
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  - DS Asia (41)
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- E History America (25)
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  - E151 United States (General) (19)
- F History United States, Canada, Latin America (27)
  - F1001 Canada (General) (1)
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- G Geography. Anthropology. Recreation (349)
  - G Geography (General) (47)
  - GA Mathematical geography. Cartography (110)
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  - GE Environmental Sciences (69)
  - GF Human ecology. Anthropogeography (64)
  - GN Anthropology (24)
  - GT Manners and customs (8)
  - GV Recreation Leisure (15)
- H Social Sciences (4895)
  - H Social Sciences (General) (87)
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  - HB Economic Theory (684)
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  - HT Communities. Classes. Races (97)
  - HV Social pathology. Social and public welfare (183)
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- J Political Science (768)
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- K Law (634)
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- L Education (327)
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    - LB2300 Higher Education (187)
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  - LC Special aspects of education (10)
    - LC5201 Education extension. Adult education. Continuing education (6)
  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (502)
  - M Music (298)
  - ML Literature of music (21)
  - MT Musical instruction and study (14)
- N Fine Arts (121)
  - N Visual arts (General) For photography, see TR (21)
  - NB Sculpture (1)
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- P Language and Literature (860)
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- Q Science (3012)
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  - QH Natural history (103)
    - QH301 Biology (44)
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  - QR Microbiology (103)
    - QR180 Immunology (42)
    - QR355 Virology (26)
- R Medicine (3713)
  - R Medicine (General) (209)
  - RA Public aspects of medicine (863)
    - RA0421 Public health. Hygiene. Preventive Medicine (352)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (4)
  - RC Internal medicine (1201)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (70)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (575)
    - RC1200 Sports Medicine (1)
  - RD Surgery (20)
  - RE Ophthalmology (533)
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  - RG Gynecology and obstetrics (344)
  - RJ Pediatrics (215)
    - RJ101 Child Health. Child health services (80)
  - RK Dentistry (3)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (43)
  - RS Pharmacy and materia medica (7)
  - RT Nursing (467)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (33)
- S Agriculture (63)
  - S Agriculture (General) (26)
  - SB Plant culture (9)
  - SD Forestry (1)
  - SF Animal culture (15)
- T Technology (2501)
  - T Technology (General) (118)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1092)
  - TC Hydraulic engineering. Ocean engineering (50)
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  - TE Highway engineering. Roads and pavements (7)
  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (20)
  - TH Building construction (66)
  - TJ Mechanical engineering and machinery (428)
  - TK Electrical engineering. Electronics Nuclear engineering (611)
  - TL Motor vehicles. Aeronautics. Astronautics (245)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (5)
  - TR Photography (6)
  - TS Manufactures (1)
  - TX Home economics (48)
- U Military Science (24)
  - U Military Science (General) (2)
- V Naval Science (13)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (735)
  - Z665 Library Science. Information Science (641)
  - Z719 Libraries (General) (11)
  - ZA Information resources (89)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)