Columbia subject headings:
Gompers, Samuel, 1850-1924--Archives.
Labor movement--United States--History--Sources.
Labor unions--United States--History--Sources.
Harvard subject headings:
Gompers, Samuel, 1850-1924--Archives.
Labor movement--United States--History--Sources.
Labor unions--United States--History--Sources.
Working class--United States--History--Sources.
Princeton subject headings: