Janusz Nowak. "OBORA PROJECT   MANAGEMENT OF OPEN PIT MINE FOR RECREATION AND HEALTH PURPOSES USING NATURAL CONDITIONS." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2012 12th International Multidisciplinary Scientific GeoConference, 2012. https://doi.org/10.5593/sgem2012/s03.v1001