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Yen, T.-C. (1952). Freshwater molluscan fauna from an Upper Cretaceous porcellanite near Sage Junction, Wyoming. American Journal of Science. 250(5): 344-359.
Yen, T.-C. (1952). Freshwater molluscan fauna from an Upper Cretaceous porcellanite near Sage Junction, Wyoming. American Journal of Science. 250(5): 344-359.
