Hahman, W.R., Sr., 1978, Preliminary map - Geothermal energy resources of Arizona, in Hahman, W.R., Sr., ed., Low-temperature geothermal reservoir site evaluation in Arizona, Quarterly progress report for the period February 1, 1978 - April 30, 1978: U.S. Department of Energy Report COO/4362-4, p. 5-9.