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Balashov Z.G. (1968). Эндоцератоидеи ордовика СССР [= The Ordovician Endoceratoidea of the USSR]. Leningrad: The Leningrad University Press. 278 pp.
Balashov Z.G. (1968). Эндоцератоидеи ордовика СССР [= The Ordovician Endoceratoidea of the USSR]. Leningrad: The Leningrad University Press. 278 pp.