Columbia subject headings:
Construction industry--United States.
Labor costs--United States.
Labor unions--Construction workers--United States.
Open and closed shop--United States.
Restrictive practices in industrial relations--United States.
Wages--Construction workers--United States.
Harvard subject headings:
Construction industry--United States.
Construction workers--Labor unions--United States.
Labor costs--United States.
Open and closed shop--United States.
Restrictive practices in industrial relations--United States.
Wages--Construction workers--United States.
Princeton subject headings:
Construction industry--United States.
Construction workers--Labor unions--United States.
Labor costs--United States.
Open and closed shop--United States.
Restrictive practices in industrial relations--United States.
Wages--Construction workers--United States.