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Yen, T.-C. (1954). Nonmarine Mollusks of Late Cretaceous Age From Wyoming, Utah and Colorado. Part 1: A fauna from western Wyoming. United States Geological Survey Professional Paper. 254-B: 45-59.
Yen, T.-C. (1954). Nonmarine Mollusks of Late Cretaceous Age From Wyoming, Utah and Colorado. Part 1: A fauna from western Wyoming. United States Geological Survey Professional Paper. 254-B: 45-59.
