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Gellenbeck, D.J., and Coes, A.L., 1999, Ground-water quality in alluvial basins that have minimal urban development, south-central Arizona: U.S. Geological Survey Water-Resources Investigations Report 99-4005, 27 p.

Soil Conservation Service, Economic Research Service, Forest Service, and Arizona Water Commission, 1977, Santa Cruz-San Pedro River basin, Arizona: Resource inventory: U.S. Department of Agriculture Soil Conservation Service, [350] p.

Turner, S.F., and others, 1943, Ground-water resources of the Santa Cruz Basin, Arizona: U.S. Geological Survey Open-File Report [unnumbered], Tucson, Ariz., May 14, 1943, [89] p., 3 sheets, scales 1:23,000, 1:200,000, and 1:500,000.

Pima Association of Governments, 1994, Water quality: State of the region report: Tucson, Ariz., [177] p.

Tellman, Barbara, Glass, Clint, Wallace, John, and Fuller, J.E., 2000, An overview of Pima County's watersheds and watercourses: Pima County, Ariz., Sonoran Desert Conservation Plan Report, 215 p.

Horstman, K.C., 1996, Geological, remote sensing, and geophysical investigation of the greater Arivaca region, Pima and Santa Cruz Counties, Arizona: Tucson, University of Arizona Ph.D. dissertation, 106 p., 3 sheets, scale 1:100,000.

Riggs, N.R., Hon, K.A., and Haxel, G.B., 1994, Early to Middle Jurassic magmatic arc rocks of south-central and southeastern Arizona, in Thorman, C.H., and Lane, D.E., eds., USGS Research on Mineral Resources - 1994, Part B - Guidebook for Field Trips, Ninth V.E. McKelvey Forum on Mineral and Energy Resources: U.S. Geological Survey Circular 1103-B, p. 7-13.

Reeter, R.W., and Cady, C.V., 1982, Maps showing ground-water conditions in the Avra/Altar Valley area, Pima and Santa Cruz Counties, Arizona - 1981: Arizona Department of Water Resources Hydrologic Map Series Report no. 7, 2 sheets, scale 1:125,000.

Conley, J.N., Koester, E.A., and Rauzi, S.L., 1995, Well location map, Pima and Santa Cruz Co., Arizona - wells posted to January 1995: Arizona Geological Survey Oil and Gas Publication OG-9, 1 sheet, scale 1:500,000.

Haxel, G.B., Anderson, T.H., Riggs, N.R., and Goodwin, L.G., 1988, The Papago terrane: A crustal anomaly in south-central Arizona and north-central Sonora [abs.]: Geological Society of America Abstracts with Programs, v. 20, no. 3, p. 168.