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1956
Downs, Theodore. "The Mascall Fauna from the Miocene of Oregon." University of California Publications in Geological Sciences 31, no. 5 (1956): 199-354.
1923
Clark, Bruce L., and Ralph Arnold. "Fauna of the Sooke Formation, Vancouver Island." Bulletin of the Department of Geological Sciences 14, no. 5 (1923): 123-234.
1906
Arnold, Ralph. The Tertiary and Quaternary Pectens of California In U. S. Geological Survey Professional Paper. Vol. 47. Department of the Interior, 1906.