Skull Valley

Johnson, M.G., 1974, Placer gold deposits in the southwest: Mining Engineering, v. 26, no. 3, p. 20-23.

Johnson, M.G., 1972, Placer gold deposits of Arizona: U.S. Geological Survey Bulletin 1355, 103 p., 1 sheet.

Hewett, D.F., Callaghan, E., Moore, B.N., Nolan, T.B., Rubey, W.W., and Schaller, W.T., 1936, Mineral resources of the region around Boulder Dam: U.S. Geological Survey Bulletin 871, 197 p., 3 sheets, scale 1:1,500,000.

Hess, F.L., 1921, Molybdenum, in Mineral resources of the United States, 1918, Part I - Metals: U.S. Geological Survey (Washington, D.C., Government Printing Office), p. 795-805.

Halpenny, L.C., and others, 1952, Ground water in the Gila River basin and adjacent areas, Arizona--A summary: U.S. Geological Survey Open-File Report [unnumbered], Tucson, Ariz., October 1952, 224 p.

Glanzman, R.K., 1978, New occurrences of the lithium-rich smectite, hectorite, in Geological Survey research 1978: U.S. Geological Survey Professional Paper 1100, p. 42-43.

Emer, D.F., Shenk, J.D., and Spencer, J.E., 1988, Reconnaissance gamma-ray spectrometer survey of radon-decay products in selected populated areas of Arizona: Arizona Geological Survey Open-File Report 88-12, 88 p.

DeWitt, Ed, 1989, Geochemistry and tectonic polarity of Early Proterozoic (1700-1750-Ma) plutonic rocks, north-central Arizona, in Jenney, J.P., and Reynolds, S.J., eds., Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 149-163.

DeWitt, Ed, ed., 1987, Proterozoic ore deposits of the southwestern U.S.; Guidebook prepared for Society of Economic Geologists Field Conference - 22-24 October 1987: Society of Economic Geologists Guidebook Series, v. 1, 189 p.

Clark, R.J., 1979, Hydrogeochemical and stream sediment reconnaissance basic data report for the Prescott NTMS quadrangle, Arizona: U.S. Department of Energy Report GJBX-122(79), 92 p., 6 sheets, 7 microfiche.