Columbia subject headings:
Medicine, Rural--Practice--Puerto Rico.
Medicine--Political aspects--Puerto Rico.
Physicians--Puerto Rico--Social conditions.
Rural health services--Puerto Rico.
Tropical medicine--Puerto Rico.
United States--Relations--Puerto Rico.
Harvard subject headings:
Medicine, Rural--Practice--Puerto Rico.
Medicine--Political aspects--Puerto Rico.
Physicians--Puerto Rico--Social conditions.
Puerto Rico--Relations--United States
Rural health services--Puerto Rico.
Tropical medicine--Puerto Rico.
United States--Relations--Puerto Rico
Princeton subject headings: