Columbia subject headings:
Cologne (Germany)--History.
Socialist parties--Germany--Cologne--History.
Sozialdemokratische Partei Deutschlands.
Harvard subject headings:
Cologne (Germany)--History.
Socialist parties--Germany--Cologne--History.
Sozialdemokratische Partei Deutschlands
Princeton subject headings:
Cologne (Germany)--Politics and government.
Rheinische Zeitung.
Socialists--Germany(West)--Cologne--Biography.
Socilism--Germany (West)--Cologne--History.
Sozialdemokratische Partei Deutschlands--History.
Working class--Germany (West)--Cologne--Political activity--History.