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Library of Congress Subject Areas (6892)
- A General Works (1379)
  - AC Collections. Series. Collected works (301)
  - AI Indexes (General) (1092)
  - AM Museums (General). Collectors and collecting (General) (6)
- B Philosophy. Psychology. Religion (202)
  - B Philosophy (General) (2)
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- G Geography. Anthropology. Recreation (139)
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- H Social Sciences (214)
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    - HD28 Management. Industrial Management (70)
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  - HV Social pathology. Social and public welfare (78)
- L Education (229)
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- Q Science (511)
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- R Medicine (5589)
  - R Medicine (General) (3195)
  - RA Public aspects of medicine (771)
    - RA0421 Public health. Hygiene. Preventive Medicine (459)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (22)
  - RB Pathology (35)
  - RC Internal medicine (697)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (192)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (224)
    - RC1200 Sports Medicine (5)
  - RD Surgery (116)
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  - RG Gynecology and obstetrics (199)
  - RJ Pediatrics (270)
    - RJ101 Child Health. Child health services (23)
  - RK Dentistry (593)
  - RL Dermatology (111)
  - RM Therapeutics. Pharmacology (594)
  - RS Pharmacy and materia medica (531)
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  - RV Botanic, Thomsonian, and eclectic medicine (105)
  - RZ Other systems of medicine (196)
- S Agriculture (4)
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- T Technology (42)
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  - TL Motor vehicles. Aeronautics. Astronautics (2)
- Z Bibliography. Library Science. Information Resources (99)
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  - ZA Information resources (77)
    - ZA4050 Electronic information resources (67)
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