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Yen, T.-C. (1949). Review of the Lower Cretaceous Fresh-Water Molluscan Faunas of North America. Journal of Paleontology. 23(5): 465-470.
Yen, T.-C. (1949). Review of the Lower Cretaceous Fresh-Water Molluscan Faunas of North America. Journal of Paleontology. 23(5): 465-470.