TY  - CPAPER
AU  - Aglaida Toteva
TI  - ROLE OF COAL LAYERS FOR THE FORMATION OF CHEMICAL COMPOSITION OF THE UPPER PONTIAN AQUIFER, NORTHWEST BULGARIA
T2  - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings19th, Science and Technologies in Geology, Exploration And Mining
PY  - 2019
SP  - 461
EP  - 468
DO  - 10.5593/sgem2019/1.2/s02.059
PB  - STEF92 Technology
ER  -