Borys Borowka. IMPACT OF THE FORMAL REQUIREMENTS AND GEOLOGICAL AND MINING CONDITIONS ON THE EXPLOITATION OF HARD COAL RESOURCES IN UPPER SILESIAN COAL BASIN (POLAND. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 15th International Multidisciplinary Scientific GeoConference SGEM2015, SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING, 2015. https://doi.org/10.5593/sgem2015/b11/s1.031