Przemysław Bukowski. HYDROGEOLOGICAL RESEARCH METHODS AS A TOOL FOR ASSESSMENT OF THE FREE SPACE CAPACITY IN ROCK MASS, GOAFS AND MINING EXCAVATIONS IN COAL MINES IN UPPER SILESIAN COAL BASIN. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Minining, 2018, pp. 357-364. https://doi.org/10.5593/sgem2018/1.2/s02.045