Columbia subject headings:
Germany--History--Revolution, 1918.
Solingen (Germany)--Politics and government.
Working class--Political activity--Germany--Solingen--History.
Harvard subject headings:
Germany--History--Revolution, 1918.
Solingen (Germany)--Politics and government.
Working class--Germany--Solingen--Political activity--History.
Princeton subject headings:
Germany--History--Revolution, 1918.
Labor movement--Germany (West)--Solingen--History.
Solingen (Germany)--Politics and government.