Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--1789-1900
Germany--Politics and government--20th century
Political parties--Germany--History.
Socialism--Germany
Sozialdemokratische Partei Deutschlands--History.
Princeton subject headings:
Germany--Politics and government--1789-1900.
Germany--Politics and government--20th century.
Political parties--Germany--History.
Socialism--Germany.
Sozialdemokratische Partei Deutschlands--History.