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1990
Zenk, Henry B.. "Siuslawans and Coosans." In Northwest Coast, edited by Wayne Suttles, p.572-579. Vol. 7. Handbook of North American Indians 7. Washington, D.C.: Smithsonian Institution, 1990.
1954
Oregon Fish Commission. Shellfish Program. "Bay clams: A. Umpqua." Shellfish Investigation Progress Report, no. 30 (1954): 7 p.