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Grant, U. S., IV, and Leo George Hertlein. The West American Cenozoic Echinoidea In Publications of the University of California at Los Angeles in Mathematical and Physical Sciences, Edited by G. James, J. W. Ellis, F. E. Blacet, IV Grant, U. S. and B. M. Varney. Vol. 2. Berkeley, California: University of California Press, 1938.