Columbia subject headings:
Arbitration, Industrial--United States--Congresses.
Labor unions--Law and legislation--United States--Congresses.
Harvard subject headings:
Arbitration, Industrial--United States--Congresses.
Labor unions--Law and legislation--United States--Congresses.
Princeton subject headings:
Arbitration, Industrial--United States--Congresses.
Labor unions--Law and legislation--United States--Congresses.