Gems

Thomas, B.E., 1951, The Emerald Isle copper deposit: Economic Geology, v. 46, no. 2, p. 231-233.

Thomas, B.E., 1949, Ore deposits of the Wallapai district, Arizona: Economic Geology, v. 44, no. 8, p. 663-705.

Thomas, B.E., 1949, Geology and ore deposits of the Wallapai district, Mohave County, Arizona: Pasadena, California Institute of Technology, Ph.D. dissertation, 187 p.

Stipp, T.F., Haigler, L.B., Alto, B.R., and Sutherland, H.L., comps., 1967, Reported occurrences of selected minerals in Arizona: U.S. Geological Survey Mineral Investigations Resource Map MR-46, 2 sheets, scale 1:500,000.

Spendlove, Earl, 1984, Fieldtrip; Colorado River agate: Rock and Gem, v. 14, p. 74-75.

Sigleo, 1975, Turquoise mine and artifact correlation for Snaketown site, Arizona: Science, v. 189, p. 459-560.

Schreiner, R.A., 1985, Mineral resources of the lower Burro Creek wilderness study area (AZ-020-060), Mojave and Yavapai Counties Arizona: U.S. Bureau of Mines Mineral Land Assessment Open File Report MLA 51-85, 71 p., 1 sheet, scale 1:24,000.

Schrader, F.C., 1915, Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, with contributions by J.M. Hill: U.S. Geological Survey Bulletin 582, 373 p., 3 sheets, scale 1:125,000.

Schrader, F.C., 1909, Mineral deposits of the Cerbat Range, Black Mountains, and Grand Wash Cliffs, Mohave County, Arizona: U.S. Geological Survey Bulletin 397, 226 p., 1 sheet, scale 1:250,000.

Richter, D.H., Sharp, W.N., Watts, K.C., Raines, G.L., Houser, B.B., and Klein, D.P., 1986, Maps showing mineral resource assessment of the Silver City 1o x 2o quadrangle, New Mexico and Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-1310-F, 24 p., 1 sheet, scale 1:250,000.