Gawor, Łukasz, Anna Szmatłoch, and Piotr Dolnicki. “Valorization of Post-Mining Dumping Grounds As Geotourism Sites on the Example of the Ruhr Region”. Studies of the Industrial Geography Commission of the Polish Geographical Society 24 (October 1, 2013): 106–118. Accessed May 19, 2024. https://prace-kgp.uken.krakow.pl/article/view/1503.