VOLUME 48 (2)/August 2019

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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University of Mining and Geology, Department of Hydrogeology and Engineering Geology, Studentski Grad,Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

University of Mining and Geology “St Ivan Rilski”, Department of Mineralogy and Petrography, 1700 Sofia, Bulgaria
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Regional Historical Museum – Pernik, 2 Fizkulturna Str., 2300 Pernik, Bulgaria