TY - CPAPER AU - Iwona Klosok-Bazan AU - Paulina Kotas TI - SECONDARY POLLUTION IN THE WATER SUPPLY SYSTEM ON THE EXAMPLE OF THE OPOLE CITY T2 - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Ecology, Economics, Education and Legislation PY - 2017 SP - 853 EP - 860 DO - 10.5593/sgem2017/51/s20.111 PB - STEF92 Technology ER -