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Snavely, Parke Jr. D., Holly C. Wagner, and U.S. Geological Survey. Geologic sketch of Northwestern Oregon In Geological Survey Bulletin. Vol. no.1181-M. Geological Survey no.1181-M. Washington, D.C.: United States Government Printing Office, 1964.
Bromery, R. W., Parke Jr. D. Snavely, and U.S. Geological Survey. Geologic interpretation of reconnaissance gravity and aeromagnetic surveys in northwestern Oregon In Geological Survey Bulletin. Vol. no.1181-N. Geological Survey no.1181-N. Washington, D.C.: United States Government Printing Office, 1964.