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Cushman, J. A.; Grant, U. S. (1927). Late Tertiary and Quaternary Elphidiums of the west coast of North America. Transactions of the San Diego Society of Natural History. 5(6): 69-82.
Cushman, J. A.; Grant, U. S. (1927). Late Tertiary and Quaternary Elphidiums of the west coast of North America. Transactions of the San Diego Society of Natural History. 5(6): 69-82.