Fiebelkorn, Robin B., George W. Walker, Norman S. Macleod, Edwin H. McKee, and James G. Smith. Index to K-Ar Age Determinations for the State of Oregon In U. S. Geological Survey Open-File Report. Vol. 82-596. Department of the Interior, 1982.

Walker, George W., Robert C. Greene, and Eldon C. Pattee. Mineral Resources of the Mount Jefferson Primitive Area, Oregon In U. S. Geological Survey Bulletin. Vol. 1230-D. Department of the Interior, 1966.

Walker, George W., and Allan B. Griggs. Geological Investigations of Chromite in California: Part II--Coast Ranges. Chapter 2: Chromite Deposits of the Southern Coast Ranges of California In Division of Mines Bulletin. Vol. 134. California Department of Natural Resources, 1953.

Walker, George W.. The Calera Limestone in San Mateo and Santa Clara Counties, California In Division of Mines Special Report. Vol. 1-B. California Department of Natural Resources, 1950.

Walker, George W.. Sierra Blanca Limestone in Santa Barbara County, California In Division of Mines Special Report. Vol. 1-A. California Department of Natural Resources, 1950.