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Library of Congress Subject Areas (14923)
- 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 (1585)
  - B Philosophy (General) (20)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (137)
  - D History (General) (27)
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    - D901 Europe (General) (5)
  - DA Great Britain (31)
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  - DE The Mediterranean Region. The Greco-Roman World (5)
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- E History America (22)
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- F History United States, Canada, Latin America (23)
  - F1001 Canada (General) (1)
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- G Geography. Anthropology. Recreation (303)
  - G Geography (General) (47)
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  - GV Recreation Leisure (13)
- H Social Sciences (4513)
  - H Social Sciences (General) (84)
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  - HB Economic Theory (663)
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  - HQ The family. Marriage. Woman (133)
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  - HT Communities. Classes. Races (89)
  - HV Social pathology. Social and public welfare (171)
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- J Political Science (676)
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- K Law (594)
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- L Education (310)
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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 (475)
  - M Music (284)
  - ML Literature of music (21)
  - MT Musical instruction and study (14)
- N Fine Arts (106)
  - N Visual arts (General) For photography, see TR (19)
  - NB Sculpture (1)
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- P Language and Literature (811)
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- Q Science (2798)
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  - QH Natural history (93)
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- R Medicine (3336)
  - R Medicine (General) (203)
  - RA Public aspects of medicine (723)
    - RA0421 Public health. Hygiene. Preventive Medicine (237)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (4)
  - RC Internal medicine (1048)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (54)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (473)
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  - RD Surgery (20)
  - RE Ophthalmology (494)
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  - RG Gynecology and obstetrics (297)
  - RJ Pediatrics (192)
    - RJ101 Child Health. Child health services (74)
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  - RM Therapeutics. Pharmacology (21)
  - RS Pharmacy and materia medica (6)
  - RT Nursing (374)
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  - RZ Other systems of medicine (32)
- S Agriculture (54)
  - S Agriculture (General) (23)
  - SB Plant culture (7)
  - SD Forestry (1)
  - SF Animal culture (12)
- T Technology (2332)
  - T Technology (General) (110)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1046)
  - TC Hydraulic engineering. Ocean engineering (45)
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  - TE Highway engineering. Roads and pavements (7)
  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (19)
  - TH Building construction (61)
  - TJ Mechanical engineering and machinery (390)
  - TK Electrical engineering. Electronics Nuclear engineering (561)
  - TL Motor vehicles. Aeronautics. Astronautics (205)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (3)
  - TR Photography (6)
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  - TX Home economics (33)
- U Military Science (22)
  - U Military Science (General) (2)
- V Naval Science (8)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (714)
  - Z665 Library Science. Information Science (622)
  - Z719 Libraries (General) (11)
  - ZA Information resources (85)
    - ZA4050 Electronic information resources (67)
    - ZA4450 Databases (10)