Bik, Andrzej, Jerzy Jarosz, Marek Widera, and Elżbieta Worobiec. “Sieniawa Lignite Mine - Extraordinary History, Geology and Mining Achievements During the Last Decade”. Geologos 32 (July 1, 2026). Accessed July 16, 2026. https://pressto.amu.edu.pl/index.php/logos/article/view/54980.