Bedinger, M.S., Sargent, K.A., and Langer, W.H., 1984, Sonoran region, Arizona, in Bedinger, M.S. and others, Studies of geology and hydrology in the Basin and Range province, southwestern United States, for isolation of high-level radioactive waste: Evaluation of the regions: U.S. Geological Survey Open-File Report 84-0745, p. 81-108, 2 sheets, scale 1:300,000.