Areas in Arizona with elevated concentrations of uranium, in Spencer, J.E., ed., Radon in Arizona

Spencer, J.E., Shenk, J.D., and Duncan, J.T., 1990, Areas in Arizona with elevated concentrations of uranium, in Spencer, J.E., ed., Radon in Arizona: Arizona Geological Survey Open-File Report 90-05, 1 sheet, scale 1:1,000,000 [superseded by Spencer, J.E., Shenk, J.D., and Duncan, J.T. (1993), Arizona Geological Survey Bulletin 199, plate 1, scale 1:1,000,000].