United States. Department of the Interior. Geological Survey. and Clarence E. Dutton. Atlas to Accompany the Monograph on the Tertiary History of the Grand Canon District, Book, 1882; digital images, (http://texashistory.unt.edu/ark:/67531/metapth41354/ : accessed May 23, 2013), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting University of Texas at Arlington Library, Arlington, Texas.
Atlas to Accompany the Monograph on the Tertiary History of the Grand Canon District
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