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1906
Arnold, Ralph. "Geological Reconnaissance of the Coast of the Olympic Peninsula, Washington." Bulletin of the Geological Society of America 17 (1906): 451-468.
Arnold, Ralph. The Tertiary and Quaternary Pectens of California In U. S. Geological Survey Professional Paper. Vol. 47. Department of the Interior, 1906.
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.