Columbia subject headings:
Socialism--Germany--Hamborn (Duisburg)--History.
Socialism--Germany--Remscheid--History.
Working class--Political activity--Germany--Hamborn (Duisburg)--History.
Working class--Political activity--Germany--Remscheid--History.
Harvard subject headings:
Socialism--Germany--Hamborn (Duisburg)
Socialism--Germany--Hamborn--History.
Socialism--Germany--Remscheid--History.
Socialism--Germany--Remscheid.
Working class--Germany--Hamborn (Duisburg)--History.
Working class--Germany--Hamborn--Political activity--History.
Working class--Germany--Remscheid--History.
Working class--Germany--Remscheid--Political activity--History.
Princeton subject headings:
Socialism--Germany--Hamborn (Duisburg)--History.
Socialism--Germany--Remscheid--History.
Working class--Germany--Hamborn (Duisburg)--History.
Working class--Germany--Remscheid--History.