The Bishop Ash Bed (Middle Pleistocene) and some older (Pliocene and Pleistocene) chemically and mineralogically similar ash beds in California, Nevada, and Utah / by Glen A. Izett, John D. Obradovich, and Harald H. Mehnert.
Publication Info.
[Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1988.
Washington : United States Government Printing Office