|
Polish miners in the Ruhr district | their social situation and trade union activity | Kleßmann, Christoph | 1985 | |
|
Polish miners in the Ruhr district | their social situation and trade union activity | Kleßmann, Christoph | 1985 |
Katalog- und Bestandsdaten von lobid.org unter CC0 | Kartenbilder von Wikimedia, Kartendaten von OpenStreetMap unter CC-BY-SA