Columbia subject headings:
Germany--Politics and government--1918-1933.
Labor unions--Political activity--Germany--History.
Sozialdemokratische Partei Deutschlands--History.
Harvard subject headings:
Germany--Politics and government--1918-1933
Labor unions--Germany--Political activity--History.
Sozialdemokratische Partei Deutschlands--History.
Princeton subject headings:
Germany--Politics and government--1918-1933.
Labor unions--Germany--Political activity--History.
Sozialdemokratische Partei Deutschlands--History.