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Gerasimov P.A. (1969). Upper Substage of the Volgian Stage of the central areas of the Russian Platform. Moscow: Nauka. 144 pp. [In Russian].
Gerasimov P.A. (1969). Upper Substage of the Volgian Stage of the central areas of the Russian Platform. Moscow: Nauka. 144 pp. [In Russian].
