INFLUENCE OF THE COAL MARKET AND ENERGY POLICY IN POLAND AND THE EU FOR THE REAL VOLUME OF COAL SALES AND THE LEVEL OF EMPLOYMENT IN MINING COMPANIES
Tobor-Osadnik Katarzyna, Malgorzata Wyganowska, Anna Manowska · SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2017 17th International Multidisciplinary Scientific GeoConference


