Cockerell, T. D. A. & Henderson, J. (1912). Mollusca from the Tertiary strata of the West. Bulletin of the American Museum of Natural History. 31(20): 229-233.
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Cockerell, T. D. A. & Henderson, J.
1912
Mollusca from the Tertiary strata of the West
Bulletin of the American Museum of Natural History