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Russell, L. S. (1941). Prograngerella, a New Ancestral Land Snail from the Upper Cretaceous of Alberta. Journal of Paleontology. 15(3): 309-311.
Russell, L. S. (1941). Prograngerella, a New Ancestral Land Snail from the Upper Cretaceous of Alberta. Journal of Paleontology. 15(3): 309-311.
