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Library of Congress Subject Areas (7083)
- A General Works (28)
  - AC Collections. Series. Collected works (2)
  - AI Indexes (General) (3)
  - AS Academies and learned societies (General) (23)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (24)
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- C Auxiliary Sciences of History (3)
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- D History General and Old World (3)
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- E History America (5)
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- G Geography. Anthropology. Recreation (16)
  - G Geography (General) (6)
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- H Social Sciences (2347)
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  - HQ The family. Marriage. Woman (16)
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  - HV Social pathology. Social and public welfare (17)
  - HX Socialism. Communism. Anarchism (7)
- J Political Science (436)
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- K Law (917)
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- L Education (97)
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- N Fine Arts (11)
  - N Visual arts (General) For photography, see TR (4)
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- P Language and Literature (18)
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- Q Science (762)
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- R Medicine (2032)
  - R Medicine (General) (1110)
  - RA Public aspects of medicine (518)
    - RA0421 Public health. Hygiene. Preventive Medicine (374)
  - RB Pathology (52)
  - RC Internal medicine (42)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (7)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (7)
    - RC1200 Sports Medicine (20)
  - RD Surgery (6)
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  - RG Gynecology and obstetrics (47)
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  - RM Therapeutics. Pharmacology (38)
  - RS Pharmacy and materia medica (17)
  - RT Nursing (407)
  - RV Botanic, Thomsonian, and eclectic medicine (24)
  - RX Homeopathy (8)
  - RZ Other systems of medicine (110)
- S Agriculture (25)
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  - SH Aquaculture. Fisheries. Angling (1)
- T Technology (648)
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  - TA Engineering (General). Civil engineering (General) (380)
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  - TH Building construction (14)
  - TJ Mechanical engineering and machinery (113)
  - TK Electrical engineering. Electronics Nuclear engineering (7)
  - TL Motor vehicles. Aeronautics. Astronautics (32)
  - TN Mining engineering. Metallurgy (8)
  - TP Chemical technology (1)
  - TR Photography (3)
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  - TX Home economics (5)
- U Military Science (24)
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- V Naval Science (58)
  - V Naval Science (General) (31)
  - VM Naval architecture. Shipbuilding. Marine engineering (51)
- Z Bibliography. Library Science. Information Resources (73)
  - Z004 Books. Writing. Paleography (4)
  - Z665 Library Science. Information Science (17)
  - Z719 Libraries (General) (44)
  - ZA Information resources (18)
    - ZA4050 Electronic information resources (9)
    - ZA4450 Databases (9)