Columbia subject headings:
Civil service--United States.
Demographic transition--United States.
Labor supply--United States.
Harvard subject headings:
Civil service--United States--Personnel management.
Civil service--United States.
Demographic transition--United States.
Labor supply--United States.
United States--Officials and employees.
Princeton subject headings:
Civil service--United States--Personnel management.
Demographic transition--United States.
Labor supply--United States.
United States--Officials and employees.