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Knight, J. B. (1930). The gastropods of the Saint Louis, Missouri, Pennsylvanian outlier: the Pseudozygopleurinae. Journal of Paleontology. 4 (Suppl. 1): 78 pp., 5 pls.
Knight, J. B. (1930). The gastropods of the Saint Louis, Missouri, Pennsylvanian outlier: the Pseudozygopleurinae. Journal of Paleontology. 4 (Suppl. 1): 78 pp., 5 pls.
