Cobre Ridge

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Randolph, C.C., 1903, Arizona, in Report of the director of the Mint upon the production of the precious metals in the United States during the calendar year 1902: Washington, D.C., U.S. Bureau of the Mint, p. 55-75.

Osterkamp, W.R., 1973, Ground-water recharge in the Tucson area, Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-844-E, 1 sheet, scale 1:250,000.

Osterkamp, W.R., 1973, Map showing depth to water in wells in the Tucson area, Arizona, 1972: U.S. Geological Survey Miscellaneous Investigations Series Map I-844-D, 1 sheet, scale 1:250,000.

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Milton, M.C., 1913, The Oro Blanco district of Arizona: Engineering and Mining Journal, v. 96, no. 21, p. 1005-1007.

McKnight, E.T., Newman, W.L., and Heyl, A.V., Jr., 1962, Zinc in the United States exclusive of Alaska and Hawaii: U.S. Geological Survey Mineral Investigations Resource Map MR-19, 18 p., 1 sheet, scale 1:3,168,000.

Luning, R.H., and Brouillard, L.A., 1982, National Uranium Resource Evaluation, Nogales quadrangle, Arizona: U.S. Department of Energy Report PGJ/F-130(82), 70 p., 6 microfiche, 16 sheets.

LeMone, D.V., 1959, Devonian stratigraphy of Cochise, Pima, Santa Cruz Counties, Arizona, and Hidalgo County, New Mexico: Tucson, University of Arizona, M.S. thesis, 108 p.

Koschmann, A.H., and Bergendahl, M.H., 1968, Principal gold-producing districts of the United States: U.S. Geological Survey Professional Paper 610, 283 p.