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Stephenson, L. (1953). Mollusks from the Pepper shale member of the Woodbine formation, McLennan County, Texas. United States Geological Survey Professional Paper. 274-C: 57-67, pl. 13.
Stephenson, L. (1953). Mollusks from the Pepper shale member of the Woodbine formation, McLennan County, Texas. United States Geological Survey Professional Paper. 274-C: 57-67, pl. 13.
