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Thompson, F. G. (1957). A collection of mollusks from northern Venezuela. Occasional Papers of the Museum of Zoology University of Michigan. 591: 1-10, 4 figs, 2 pls.
Thompson, F. G. (1957). A collection of mollusks from northern Venezuela. Occasional Papers of the Museum of Zoology University of Michigan. 591: 1-10, 4 figs, 2 pls.
