Columbia subject headings:
Compulsory health insurance--United States.
Health insurance--United States--History.
National health services--United States--History.
Physicians--United States--Attitudes.
Harvard subject headings:
Compulsory health insurance--United States.
Health insurance--United States--History.
National health insurance--United States--History.
National health services--United States--History.
Physicians--United States--Attitudes.
Princeton subject headings:
Compulsory health insurance--United States.
Health insurance--United States--History.
National health services--United States--History.
Physicians--United States--Attitudes.