Columbia subject headings:
Harvard subject headings:
Collective labor agreements--United States.
Industrial relations--United States
Labor laws and legislation--United States
Labor unions--United States
Open and closed shop--United States.
Small business--United States.
Unfair labor practices--United States.
United States. National Labor Relations Board
Princeton subject headings:
Industrial relations--United States.
Labor laws and legislation--United States.
Labor unions--United States.
Small business--United States.
United States. National Labor Relations Board