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Trumbull, E. J. (1958). Shumard's type specimens of Tertiary mollusks from Oregon and other types formerly at Washington University, St. Louis. Journal of Paleontology. 32(5): 893–906.
Trumbull, E. J. (1958). Shumard's type specimens of Tertiary mollusks from Oregon and other types formerly at Washington University, St. Louis. Journal of Paleontology. 32(5): 893–906.
