Skotnicki, S.J., 1999, Geologic map of the Ninetysix Hills, Pinal County, Arizona [Ninetysix Hills NW, Ninetysix Hills NE, Ninetysix Hills SE, and Ninetysix Hills SW 7.5 min]: Arizona Geological Survey Open-File Report 99-20, 14 p., 4 sheets, scale 1:24,000.