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Vokes, E. H. (1966). The genus Vasum (Mollusca: Gastropoda) in the New World. Tulane Studies in Geology and Paleontology. 5(1): 1-36.
Vokes, E. H. (1966). The genus Vasum (Mollusca: Gastropoda) in the New World. Tulane Studies in Geology and Paleontology. 5(1): 1-36.
