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- Library of Congress Subject Areas (840)
- R Medicine (840)
- R Medicine (General) (443)
- RB Pathology (60)
- RC Internal medicine (18)
- RD Surgery (11)
- RE Ophthalmology (28)
- RJ Pediatrics (13)
- RK Dentistry (1)
- RL Dermatology (15)
- R Medicine (840)
Number of items at this level: 0.