Columbia subject headings:
Kommunistische Partei Deutschlands--History--20th century.
Labor unions--Political activity--Germany--Remscheid--History--20th century.
Labor unions--Political activity--Germany--Solingen--History--20th century.
Labor unions--Political activity--Germany--Wuppertal--History--20th century.
Sozialdemokratische Partei Deutschlands--History--20th century.
Working class--Political activity--Germany--Remscheid--History--20th century.
Working class--Political activity--Germany--Solingen--History--20th century.
Working class--Political activity--Germany--Wuppertal--History--20th century.
Harvard subject headings:
Kommunistische Partei Deutschlands--History--20th century.
Labor unions--Germany--Remscheid--Political activity--History--20th century.
Labor unions--Germany--Solingen--Political activity--History--20th century.
Labor unions--Germany--Wuppertal--Political activity--History--20th century.
Labor unions--Political activity--Germany--Remscheid--History--20th century.
Labor unions--Political activity--Germany--Solingen--History--20th century.
Labor unions--Political activity--Germany--Wuppertal--History--20th century.
Sozialdemokratische Partei Deutschlands--History--20th century.
Working class--Germany--Remscheid--Political activity--History--20th century.
Working class--Germany--Solingen--Political activity--History--20th century.
Working class--Germany--Wuppertal--Political activity--History--20th century.
Working class--Political activity--Germany--Remscheid--History--20th century.
Working class--Political activity--Germany--Solingen--History--20th century.
Working class--Political activity--Germany--Wuppertal--History--20th century.
Princeton subject headings:
Kommunistische Partei Deutschlands--History--20th century.
Labor movement--Germany (West)--Remscheid--History--20th century.
Labor movement--Germany (West)--Solingen--History--20th century.
Labor movement--Germany (West)--Wuppertal--History--20th century.
Labor unions--Germany (West)--Remscheid--Political activity--History--20th century.
Labor unions--Germany (West)--Solingen--Political activity--History--20th century.
Labor unions--Germany (West)--Wuppertal--Political activity--History--20th century.
Sozialdemokratische Partei Deutschlands--History--20th century.