Subclass RC Internal Medicine
Subclass RD Surgery
Subclass RE Ophthalmology
Subclass RF Otorhinolaryngology
Subclass RG Gynecology and Obstetrics
Subclass RJ Pediatrics
Subclass RK Dentistry
Subclass RL Dermatology
Subclass RM Therapeutics. Pharmacology
Subclass RS Pharmacy and Materia Medica
Subclass RT Nursing
Subclass RV Botanic, Thomsonian, and Eclectic Medicine
Subclass RX Homeopathy
Subclass RZ Other Systems of Medicine
Subclass S Agriculture (General)
Subclass SB Plant Culture