Columbia subject headings:
Collective bargaining--United States--Congresses.
Labor unions--Officials and employees--United States--Congresses.
Labor unions--United States--Congresses.
Labor unions--United States--Officials and employees--Congresses.
Harvard subject headings:
Collective bargaining--United States--Congresses.
Labor unions--United States--Congresses
Labor unions--United States--Officials and employees--Congresses.
Princeton subject headings:
Collective bargaining--United States--Congresses.
Labor unions--United States--Congresses.
Labor unions--United States--Officials and employees--Congresses.