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Wingard L. (1993). A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States — An example of the nature of extinction. U. S. Geological Survey Professional Paper. 1535: I-VI, 1-131; pl. 1-22.
Wingard L. (1993). A detailed taxonomy of Upper Cretaceous and Lower Tertiary Crassatellidae in the eastern United States — An example of the nature of extinction. U. S. Geological Survey Professional Paper. 1535: I-VI, 1-131; pl. 1-22.
