Columbia subject headings:
Emergency medical services--United States.
Medical emergencies.
Medicine, Rural--United States.
Rural health services--United States.
Harvard subject headings:
Emergency medical services--United States
Federal aid to rural health services--United States.
Rural health services--United States
United States--Rural conditions.
Princeton subject headings:
Emergency medical services--United States.
Federal aid to rural health services--United States.
Rural health services--United States.