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Sutphin, H.B., and Wenrich, K.J. (1989) Map of locations of collapse-breccia pipes in the Grand Canyon region of Arizona: U.S. Geological Survey Open-File Report 89-0550, 1 sheet, scale 1:250,000.
Welty, J.W., and Chenoweth, W.L. (1989) Bibliography for metallic mineral districts in Apache, Coconino, and Navajo Counties, Arizona: Arizona Geological Survey Circular 28, 47 p.
Wenrich, Karen J. & Sutphin, H.B. (1989a), Lithotectonic setting necessary for formation of a U-rich, solution-collapse breccia-pipe, Grand Canyon region, Arizona, USGS Open-File Rept. 89-0173.
Wenrich, K.J., and Sutphin, H.B. (1989b) Lithotectonic setting necessary for formation of a uranium rich, solution collapse breccia pipe province, Grand Canyon region, Arizona, in Metallogenesis of uranium deposits - Proceedings of a Technical Committee Meeting on Metallogenesis of Uranium Deposits organized by the International Atomic Energy Agency and held in Vienna, 9-12 March 1987: Vienna, International Atomic Energy Agency, p. 307-344.
Finch, W.I., Sutphin, H.B., Pierson, C.T., McCammon, R.B., and Wenrich, K.J. (1990) The 1987 estimate of undiscovered uranium endowment in the solution-collapse breccia pipes in the Grand Canyon region of northern Arizona and adjacent Utah: U.S. Geological Survey Circular 1051, 19 p.
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