Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--1789-1900
Socialism--Germany--19th century.
Socialism--Germany--History--19th century
Sozialistische Arbeiterpartei Deutschlands (1875-1890)
Princeton subject headings:
Germany--Politics and government--1789-1900.
Socialism--Germany--History--19th century.
Sozialistische Arbeiterpartei Deutschlands (1875-1890)