VOLUME 22 (4)/August 1992

Geological and Geophysical Survey Company, 1113 Sofia
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University of Sofia, Faculty of Geology and Geography, 1000 Sofia

Research Institute of Mineral Resources, 1505 Sofia, bul. Kh. Kabakchiev, 23
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Research Institute of Mineral Resources, 1505 Sofia, bul. Kh. Kabakchiev, 23
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All-Union Geological Institute "A. P. Karpinski (VSEGEI) 199026 Sankt-Peterburgh, Sredni boul., 74

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Фирма "Редкие металлы" - НПП "Георедмед", г. Бухово
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Горно-геологический университет, 1156 София
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Фирма "Редкие металлы" - НПП "Георедмед", г. Бухово

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria