Columbia subject headings:
Essen (Germany)--Politics and government.
Municipal government--Germany--Essen--History.
Sozialdemokratische Partei Deutschlands--Party work--History.
Working class--Political activity--Germany--Essen.
Harvard subject headings:
Essen (Germany)--Politics and government.
Fried. Krupp AG--History.
Labor movement--Germany--Essen--History.
Socialism--Germany--Essen--History.
Socialism--Germany--Essen.
Working class--Germany--Essen--History.
Princeton subject headings:
Essen (Germany)--Politics and government.
Fried. Krupp AG--History.
Labor movement--Germany (West)--Essen--History.
Socialism--Germany (West)--Essen--History.
Working class--Germany (West)--Essen--History.