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