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Library of Congress Subject Areas (14070)
- A General Works (6)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1479)
  - B Philosophy (General) (17)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (118)
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    - D901 Europe (General) (4)
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- E History America (19)
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- F History United States, Canada, Latin America (22)
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- G Geography. Anthropology. Recreation (258)
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- H Social Sciences (4217)
  - H Social Sciences (General) (83)
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  - HQ The family. Marriage. Woman (124)
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- J Political Science (593)
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- K Law (553)
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- L Education (288)
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  - LC Special aspects of education (10)
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  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (466)
  - M Music (280)
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  - MT Musical instruction and study (14)
- N Fine Arts (99)
  - N Visual arts (General) For photography, see TR (19)
  - NB Sculpture (1)
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- P Language and Literature (766)
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- Q Science (2580)
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  - QH Natural history (86)
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- R Medicine (3049)
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  - RA Public aspects of medicine (628)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (3)
  - RC Internal medicine (936)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (50)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (394)
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  - RD Surgery (14)
  - RE Ophthalmology (457)
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  - RJ Pediatrics (177)
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  - RK Dentistry (3)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (18)
  - RS Pharmacy and materia medica (3)
  - RT Nursing (341)
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  - RZ Other systems of medicine (32)
- S Agriculture (48)
  - S Agriculture (General) (22)
  - SB Plant culture (5)
  - SD Forestry (1)
  - SF Animal culture (11)
- T Technology (2162)
  - T Technology (General) (103)
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  - TA Engineering (General). Civil engineering (General) (1012)
  - TC Hydraulic engineering. Ocean engineering (42)
  - TD Environmental technology. Sanitary engineering (6)
  - TE Highway engineering. Roads and pavements (7)
  - TF Railroad engineering and operation (4)
  - TG Bridge engineering (19)
  - TH Building construction (54)
  - TJ Mechanical engineering and machinery (346)
  - TK Electrical engineering. Electronics Nuclear engineering (508)
  - TL Motor vehicles. Aeronautics. Astronautics (178)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (3)
  - TR Photography (6)
  - TX Home economics (17)
- U Military Science (20)
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- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (695)
  - Z665 Library Science. Information Science (608)
  - Z719 Libraries (General) (11)
  - ZA Information resources (79)
    - ZA4050 Electronic information resources (64)
    - ZA4450 Databases (9)