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1964
Mullineaux, Donal R., Thomas C. Nichols, and Robert A. Speirer. A Zone of Montmorillonitic Weathered Clay in Pleistocene Deposits at Seattle, Washington In U. S. Geological Survey Professional Paper. Vol. 501-D. Department of the Interior, 1964.
1945
Nichols, Robert L.. Preliminary Report on the King County, Washington, High-Alumina Clay Deposits In U. S. Geological Survey Strategic Minerals Investigations. Department of the Interior, 1945.