Ivan Rusanov

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

Volume 22 4 August 1992