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Yen, T.-C. (1951). Fresh-Water Mollusks of Cretaceous Age From Montana and Wyoming. Part 1: A fluviatile fauna from the Kootenai formation near Harlowton, Montana. United States Geological Survey Professional Paper. 233-A: 1-9.
Yen, T.-C. (1951). Fresh-Water Mollusks of Cretaceous Age From Montana and Wyoming. Part 1: A fluviatile fauna from the Kootenai formation near Harlowton, Montana. United States Geological Survey Professional Paper. 233-A: 1-9.
