Authors
Zbigniew Kasztelewicz
Mining Engineering & Occupational Safety, AGH University of Science and Technology, Kraków, Poland
Dagmara Frydrychowicz
District Museum in Konin, Konin, Poland
Ewa Galantkiewicz
PAK KWB Konin S.A., 600-lecia 9, Kleczew, Poland
Marek Widera
Institute of Geology, Adam Mickiewicz University, Poznań, Poland