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1963
Snavely Jr., Parke D., Holly C. Wagner, and Washington Division of Mines and Geology. Tertiary geologic history of western Oregon and Washington In Report of Investigations / State of Washington, Department of Conservation and Development, Division of Mines and Geology. Vol. no.22. Olympia, WA, 1963.
→ www.dnr.wa.gov/publications/ger_ri22_tert_geol_west_or_wa.pdf