Columbia subject headings:
Collective bargaining unit--United States.
Labor unions--Recognition--Elections--Law and legislation--United States.
United States. National Labor Relations Board.
Harvard subject headings:
Collective bargaining unit--United States.
Labor unions--Elections
Labor unions--Recognition--Elections--Law and legislation--United States.
Labor unions--United States
United States. National Labor Relations Board
Princeton subject headings:
Collective bargaining unit--United States.
Labor unions--Recognition--Elections--Law and legislation--United States.
United States. National Labor Relations Board