Columbia subject headings:
Düsseldorf (Germany)--Politics and government.
Sozialdemokratische Partei Deutschlands--History.
Working class--Political activity--Germany--Düsseldorf--History.
Harvard subject headings:
Düsseldorf (Germany)--Politics and government.
Sozialdemokratische Partei Deutschlands--History.
Working class--Germany--Düsseldorf--Political activity--History.
Princeton subject headings:
Düsseldorf (Germany)--Politics and government.
Sozialdemokratische Partei Deutschlands--History.
Working class--Germany, West--Düsseldorf--Political activity--History.