Gettings, M.E., 2002, An interpretation of the 1996 aeromagnetic data for the Santa Cruz basin, Tumacacori Mountains, Santa Rita Mountains, and Patagonia Mountains, south-central Arizona: U.S. Geological Survey Open-File Report 02-0099 [available only online: http://geopubs.wr.usgs.gov/open-file/of02-99/].