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Library of Congress Subject Areas (365)
- Q Science (40)
  - Q Science (General) (31)
  - QD Chemistry (1)
  - QH Natural history (19)
    - QH301 Biology (19)
    - QH426 Genetics (1)
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- R Medicine (334)
  - R Medicine (General) (237)
  - RA Public aspects of medicine (1)
    - RA0421 Public health. Hygiene. Preventive Medicine (1)
  - RG Gynecology and obstetrics (75)
  - RJ Pediatrics (2)
  - RS Pharmacy and materia medica (55)
  - RT Nursing (111)
  - RV Botanic, Thomsonian, and eclectic medicine (2)
  - RZ Other systems of medicine (17)