Main directions and results of modernization of Carboniferous and Permian stratigraphic chards of Ukraine (1993-2014) von V. I. Polietaiev, N. I. Boiarina, M. V. Vdovenko, V. I. Yefimenko, T. I. Nemyrovska, O. K. Shchoholiev, H. H. Kovalenko

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