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Library of Congress Subject Areas (16383)
- 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 (1802)
  - B Philosophy (General) (26)
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  - BF Psychology (1718)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (175)
  - D History (General) (34)
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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 (47)
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- E History America (25)
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- F History United States, Canada, Latin America (29)
  - F1001 Canada (General) (1)
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- G Geography. Anthropology. Recreation (381)
  - G Geography (General) (47)
  - GA Mathematical geography. Cartography (111)
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  - GE Environmental Sciences (81)
  - GF Human ecology. Anthropogeography (81)
  - GN Anthropology (31)
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- H Social Sciences (5070)
  - H Social Sciences (General) (91)
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  - HB Economic Theory (691)
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  - HD Industries. Land use. Labor (1548)
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  - HQ The family. Marriage. Woman (154)
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  - HT Communities. Classes. Races (98)
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- J Political Science (792)
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  - JV Colonies and colonization. Emigration and immigration. International migration (90)
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- K Law (648)
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- L Education (340)
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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 (518)
  - M Music (309)
  - ML Literature of music (22)
  - MT Musical instruction and study (14)
- N Fine Arts (128)
  - N Visual arts (General) For photography, see TR (22)
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- P Language and Literature (882)
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  - PN Literature (General) (365)
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    - PN2000 Dramatic representation. The Theater (8)
  - PR English literature (23)
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- Q Science (3129)
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  - QH Natural history (108)
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  - QP Physiology (22)
  - QR Microbiology (137)
    - QR180 Immunology (51)
    - QR355 Virology (44)
- R Medicine (3917)
  - R Medicine (General) (215)
  - RA Public aspects of medicine (949)
    - RA0421 Public health. Hygiene. Preventive Medicine (433)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (6)
  - RC Internal medicine (1297)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (75)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (626)
    - RC1200 Sports Medicine (1)
  - RD Surgery (21)
  - RE Ophthalmology (561)
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  - RJ Pediatrics (230)
    - RJ101 Child Health. Child health services (87)
  - RK Dentistry (3)
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  - RM Therapeutics. Pharmacology (46)
  - RS Pharmacy and materia medica (8)
  - RT Nursing (525)
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  - RZ Other systems of medicine (34)
- S Agriculture (63)
  - S Agriculture (General) (26)
  - SB Plant culture (9)
  - SD Forestry (1)
  - SF Animal culture (15)
- T Technology (2572)
  - T Technology (General) (119)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1120)
  - TC Hydraulic engineering. Ocean engineering (54)
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  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (21)
  - TH Building construction (67)
  - TJ Mechanical engineering and machinery (447)
  - TK Electrical engineering. Electronics Nuclear engineering (630)
  - TL Motor vehicles. Aeronautics. Astronautics (263)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (5)
  - TR Photography (6)
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  - TX Home economics (50)
- U Military Science (24)
  - U Military Science (General) (2)
- V Naval Science (16)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (748)
  - Z665 Library Science. Information Science (653)
  - Z719 Libraries (General) (11)
  - ZA Information resources (89)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)