Columbia subject headings:
Business--History--Congresses.
Industries--United States--History--Congresses.
United States--Commerce--History--Congresses.
Harvard subject headings:
Business--History--Congresses.
Industries--United States--History--Congresses.
United States--Commerce--History--Congresses.
Princeton subject headings:
Business--History--Congresses.
Industries--United States--History--Congresses.
United States--Commerce--History--Congresses.