- Library of Congress Subject Areas (6561)
- R Medicine (1055)
- R Medicine (General) (194)
 
- RB Pathology (56)
 
- RC Internal medicine (431)
 
- RD Surgery (113)
 
- RJ Pediatrics (118)
 
- RK Dentistry (1)
 
- RL Dermatology (3)
 
- RT Nursing (52)
 
- RX Homeopathy (13)
 
 
 - R Medicine (1055)
 
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