Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--1789-1900.
Germany--Politics and government--20th century
Germany--Social conditions--19th century.
Germany--Social conditions--20th century.
Socialism--Germany--19th century.
Socialism--Germany--20th century.
Sozialdemokratische Partei Deutschlands--History.
Princeton subject headings:
Germany--Politics and government--1789-1900.
Germany--Politics and government--20th century.
Germany--Social conditions--19th century.
Germany--Social conditions--20th century.
Socialism--Germany--19th century.
Socialism--Germany--20th century.
Sozialdemokratische Partei Deutschlands--History.