Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--20th century
Linke (Political party : Germany)
Socialism--Germany--History--20th century
Sozialdemokratische Partei Deutschlands
Princeton subject headings:
Germany--Politics and government--History--21st century.
Linkspartei (Germany)--History--21st century.
Sozialdemokratische Partei Deutschlands--History--21st century.