Subclass R - Medicine (General).

Subclass RA - Public aspects of medicine.

Subclass RB - Pathology.

Subclass RC - Internal medicine.

Subclass RD - Surgery.

Subclass RE - Ophthalmology.

Subclass RF - Otorhinolaryngology.

Subclass RG - Gynecology and obstetrics.

Subclass RJ - Padiatrics.

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.

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