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Petuch, E. J. (1988). Utetrigonia, a new trigoniid bivalve from the Permian of Colorado, U.S.A. Bulletin of Paleomalacology. 1(3): 53-55.
Petuch, E. J. (1988). Utetrigonia, a new trigoniid bivalve from the Permian of Colorado, U.S.A. Bulletin of Paleomalacology. 1(3): 53-55.
