Columbia subject headings:
Harvard subject headings:
Collective bargaining--Law and legislation--United States--Cases.
Collective bargaining--Law and legislation--United States.
Collective bargaining--United States--Cases.
Collective bargaining--United States.
United States. National Labor Relations Board
Princeton subject headings:
Collective bargaining--United States--Cases.
Collective bargaining--United States.
United States. National Labor Relations Board