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Erwin, D. H. (1988). Permian Gastropoda of the southwestern United States: Cerithiacean, Acteonacea, and Pyramidellacea. Journal of Paleontology. 62(4): 566-575.
Erwin, D. H. (1988). Permian Gastropoda of the southwestern United States: Cerithiacean, Acteonacea, and Pyramidellacea. Journal of Paleontology. 62(4): 566-575.