Johnson, J. G. (1975). Asian stringocephaloid brachiopod genera Omolonia and Paracrothyris in the Middle Devonian of western North America. Journal of Paleontology. 49: 979-983.
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Johnson, J. G.
1975
Asian stringocephaloid brachiopod genera <i>Omolonia</i> and <i>Paracrothyris</i> in the Middle Devonian of western North America