Columbia subject headings:
Industrial relations--United States--Congresses.
Labor unions--United States--Congresses.
Manufactures--United States--Congresses.
Manufacturing industries--United States--Congresses.
Harvard subject headings:
Industrial relations--United States--Congresses
Labor unions--United States--Congresses
Manufactures--United States--Congresses.
Manufacturing industries--United States--Congresses.
Princeton subject headings:
Industrial relations--United States--Congresses.
Labor unions--United States--Congresses.
Manufacturing industries--United States--Congresses.