Das rote Berlin eine Geschichte der Berliner Arbeiterbewegung 1830-1934

by Weipert, Axel
Published: Berlin | BWV Berliner Wissenschafts-Verlag | 2019

The Polish coal miners' union and the German labor movement in the Ruhr, 1902-1934 national and social solidarity

by Kulczycki, John J.
Published: Oxford [u.a.] | Berg | 1997