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Parkhaev P.Yu. (2005). Two New Species of the Cambrian Helcionelloid Mollusks from the Northern Part of the Siberian Platform. Paleontological Journal. 39(6): 615-619. [Russian text see Paleontologicheskiy Zhurnal, 2005, No. 6. pp. 43-46].
Parkhaev P.Yu. (2005). Two New Species of the Cambrian Helcionelloid Mollusks from the Northern Part of the Siberian Platform. Paleontological Journal. 39(6): 615-619. [Russian text see Paleontologicheskiy Zhurnal, 2005, No. 6. pp. 43-46].
