Peirce, H.W., 1985, Arizona's backbone: The Transition Zone: Fieldnotes [Arizona Bureau of Geology and Mineral Technology], v. 15, no. 3, p. 1-6.
Peirce, H.W.
Fieldnotes [Arizona Bureau of Geology and Mineral Technology], v. 15, no. 3, p. 1-6.
Physiography, Structure, Tectonics, Landscape Evolution,