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Sumner, J.R., 1972, Tectonic significance of gravity and aeromagnetic investigations at the head of the Gulf of California: Geological Society of America Bulletin, v. 83, no. 10, p. 3103-3120, 1 sheet, scales 1:750,000 and 1:1:000,000.
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Simmons, H.L., 1966, The geology of the Cabeza Prieta Game Range: Arizona Geological Society Digest, v. 8, p. 147-157.
Klein, D.P., and Kucks, R.P., 1991, Gravity and aeromagnetic anomaly maps of the Ajo and Lukeville 1o x 2o quadrangles, southwestern Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-2139, 3 sheets, scale 1:250,000.
Wilson, E.D., 1960, Geologic map of Yuma County, Arizona: Arizona Bureau of Mines, 1 sheet, scale 1:375,000 [includes La Paz County; now available as Arizona Geological Survey Map M-3-11].
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