Columbia subject headings:
Employer-sponsored health insurance--United States--History.
Health insurance--United States--History.
Medical care--United States.
Harvard subject headings:
Employer-sponsored health insurance--United States--History.
Health insurance--United States--History.
Medical care--United States
Princeton subject headings:
Employer-sponsored health insurance--United States--History.
Health insurance--United States--History.
Medical care--United States.