Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--1871-1918.
Labor movement--Austria--History
Labor movement--Germany--History
Socialism--Austria--History
Socialism--Germany--History
Sozialdemokratische Partei Deutschlands
Princeton subject headings:
Germany--Politics and government--1871-1918.
Labor movement--Germany--History--19th century.
Labor movement--Germany--History--20th century.
Socialism--Germany--19th century.
Socialism--Germany--20th century.
Sozialdemokratische Partei Deutschlands.