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The writer for these signs is unknown. The book that most complements the text of these signs is Lengner’s A Trip Through Death Valley’s Geologic Past, Deep Enough Press, ISBN 978-0-9820883-2-6. Usually available at the museum.
As to Death Valley, the Death Valley region, and all of Southern California, everything written by Professor Gregg Wilkerson of California State University at Bakersfield is a must.