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Library of Congress Subject Areas (14465)
- 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 (1542)
  - B Philosophy (General) (20)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (127)
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    - D901 Europe (General) (4)
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  - DE The Mediterranean Region. The Greco-Roman World (5)
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- E History America (19)
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- F History United States, Canada, Latin America (23)
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- G Geography. Anthropology. Recreation (279)
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- H Social Sciences (4357)
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- J Political Science (643)
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- K Law (579)
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- L Education (302)
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  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (469)
  - M Music (280)
  - ML Literature of music (21)
  - MT Musical instruction and study (14)
- N Fine Arts (103)
  - N Visual arts (General) For photography, see TR (19)
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- P Language and Literature (790)
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    - PN2000 Dramatic representation. The Theater (6)
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- Q Science (2666)
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- R Medicine (3164)
  - R Medicine (General) (194)
  - RA Public aspects of medicine (656)
    - RA0421 Public health. Hygiene. Preventive Medicine (194)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (3)
  - RC Internal medicine (1003)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (51)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (446)
    - RC1200 Sports Medicine (1)
  - RD Surgery (15)
  - RE Ophthalmology (469)
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  - RG Gynecology and obstetrics (282)
  - RJ Pediatrics (187)
    - RJ101 Child Health. Child health services (72)
  - RK Dentistry (3)
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  - RM Therapeutics. Pharmacology (18)
  - RS Pharmacy and materia medica (4)
  - RT Nursing (355)
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  - RZ Other systems of medicine (32)
- S Agriculture (51)
  - S Agriculture (General) (22)
  - SB Plant culture (6)
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  - SF Animal culture (12)
- T Technology (2235)
  - T Technology (General) (107)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1026)
  - TC Hydraulic engineering. Ocean engineering (42)
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  - TF Railroad engineering and operation (5)
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  - TH Building construction (57)
  - TJ Mechanical engineering and machinery (360)
  - TK Electrical engineering. Electronics Nuclear engineering (542)
  - TL Motor vehicles. Aeronautics. Astronautics (184)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (3)
  - TR Photography (6)
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  - TX Home economics (21)
- 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 (710)
  - Z665 Library Science. Information Science (619)
  - Z719 Libraries (General) (11)
  - ZA Information resources (84)
    - ZA4050 Electronic information resources (66)
    - ZA4450 Databases (10)