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The Ordovician system in most of Russian Asia
The Ordovician system in most of Russian Asia
By Reuben James Ross,John A. Talent

Geology of the U.S.S.R., by Dmitriy V. Nalivkin. Transl. from the Russian by Nicolas Rast. Edited by Nicolas Rast and T.S. Westoll
By D. V. Nalivkin