Columbia subject headings:
Industrial relations--Study and teaching--United States.
Working class--History--Research--United States.
Working class--United States--History--Bibliography.
Harvard subject headings:
Industrial relations--Study and teaching--United States.
Labor movement--History--Research--United States.
Labor movement--United States--History--Bibliography.
Working class--History--Research--United States.
Working class--United States--History--Bibliography.
Princeton subject headings:
Industrial relations--Study and teaching--United States.
Labor movement--History--Research--United States.
Labor movement--United States--History--Bibliography.