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Library of Congress Subject Areas (2614)
- A General Works (7)
  - AI Indexes (General) (2)
  - AS Academies and learned societies (General) (5)
- H Social Sciences (19)
  - HB Economic Theory (10)
  - HC Economic History and Conditions (1)
  - HD Industries. Land use. Labor (1)
  - HF Commerce (8)
  - HV Social pathology. Social and public welfare (1)
- L Education (1)
  - LB Theory and practice of education (1)
- R Medicine (2587)
  - R Medicine (General) (2)
  - RB Pathology (10)
  - RG Gynecology and obstetrics (361)
  - RJ Pediatrics (3)
  - RM Therapeutics. Pharmacology (1)
  - RS Pharmacy and materia medica (494)
  - RT Nursing (1655)
  - RZ Other systems of medicine (62)