Ruslan Kostov

Department of Mineralogy and Petrography, Faculty of Geology and Prospecting, University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia, Bulgaria

Volume 39 1-2 September 2010

Gemmologisches Institut Hamburg, Gerhofstrasse 19, 20354 Hamburg, Germany
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University of Mining and Geology, St. Ivan Rilski“, 1700 Sofia, Bulgaria

Volume 39 1-2 September 2010