Columbia subject headings:
European Americans--History--Congresses.
Immigrants--United States--History--Congresses.
Working class--United States--History--Congresses.
Harvard subject headings:
European Americans--History--Congresses.
Immigrants--United States--History--Congresses.
Working class--United States--History--Congresses.
Princeton subject headings:
European Americans--History--Congresses.
Immigrants--United States--History--Congresses.
Working class--United States--History--Congresses.