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Helmersen 1872–Russian. The naming of the Permian System

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posted on 2021-05-13, 14:26 authored by Michael J. Benton, Andrey G. Sennikov
Original text from Helmersen, G.P. 1872. Sir Roderick Impey Murchison: [Obituary]. Gorniy Zhurnal, 1872(2), 340–352. (In Russian).

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