Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--20th century
Labor unions--Germany--Political activity--History--20th century.
Verband der Deutschen Gewerkvereine.
Princeton subject headings:
Germany--History--1789-1900.
Germany--History--20th century.
Labor unions--Germany--History.
Labor unions--Germany--Political activity.
Verband der Deutschen Gewerkvereine--History.