Columbia subject headings:
Germany--Politics and government--1871-1918.
Socialism--Germany.
Sozialdemokratische Partei Deutschlands.
Harvard subject headings:
Germany--Politics and government--1871-1918.
Socialism--Germany
Sozialdemokratische Partei Deutschlands
Princeton subject headings:
Germany--Politics and government--1871-1918.
Socialism--Germany.
Sozialdemokratische Partei Deutschlands.