Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--20th century
Linkspartei (Germany)--History.
Socialism--Germany--20th century.
Socialism--Germany--History--20th century
Sozialdemokratische Partei Deutschlands--History.
Princeton subject headings:
Germany--Politics and government--20th century.
Linkspartei (Germany)--History.
Socialism--Germany--History--20th century.
Sozialdemokratische Partei Deutschlands--History.