Gequälte Nation
Subtitle: das Buch vom Ruhrkampf
By: von Wilhelm Wiedfeld.
Publisher: Duisburger Verlagsanstalt
Published: 1933
Place of publication: Duisburg
Language: ger
Number of pages: 368
Subjects: Ruhr River and Valley.
Notes: "Benutzte quellen": p. 7.