Columbia subject headings:
Harvard subject headings:
General Strike, Germany, 1920.
Pelkum (Germany)--History.
Ruhr (Germany : Region)--History
Socialism--Germany--20th century.
Socialism--Germany--History--20th century
Princeton subject headings:
Hamm Region (North Rhine-Westphalia, Germany)--History.
Pelkum (Germany)--History--Uprising, 1920.
Working class--Germany--Pelkum--Political activity.