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Grant, U. S. I. & Hertlein, L. G. 1938. The West American Cenozoic Echinoidea. Publications of the University of California at Los Angeles in Mathematical and Physical Sciences 2, 1-225.
Grant, U. S. I. & Hertlein, L. G. 1938. The West American Cenozoic Echinoidea. Publications of the University of California at Los Angeles in Mathematical and Physical Sciences 2, 1-225.
