Columbia subject headings:
Harvard subject headings:
Collective bargaining--Fire fighters--United States.
Collective bargaining--Police--United States.
Fire fighters--Labor unions--United States.
Police--Labor unions--United States.
Princeton subject headings:
Collective bargaining--Fire fighters--United States.
Collective bargaining--Police--United States.
Fire fighters--Labor unions--United States.
Police--Labor unions--United States.