Columbia subject headings:
Germany--Politics and government--20th century.
Socialism--Germany--History--20th century.
Sozialdemokratische Partei Deutschlands--History.
Harvard subject headings:
Germany--Politics and government--1918-1933
Germany--Politics and government--1933-1945.
Germany--Politics and government--20th century
Socialism--Germany--20th century.
Socialism--Germany--History--20th century
Sozialdemokratische Partei Deutschlands--History.
Princeton subject headings:
Germany--Politics and government--20th century.
Socialism--Germany--History--20th century.
Sozialdemokratische Partei Deutschlands--History.