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Wilson, E.D., 1941, Tungsten deposits of Arizona: Arizona Bureau of Mines Bulletin no. 148, 54 p.

Wilson, C.A., 1960, Ore controls of the San Xavier mine, Pima County, Arizona: Tucson, University of Arizona, M.S. thesis, 58 p.

Whitcomb, H.A., 1948, Geology of the Morgan mine area, Twin Buttes, Arizona: Tucson, University of Arizona, M.S. thesis, 83 p.

Wahl, D.E., Jr., 1980, Mid-Tertiary volcanic geology in parts of Greenlee County, Arizona, Grant and Hidalgo Counties, New Mexico: Tempe, Arizona State University, Ph.D. dissertation, 147 p., 2 sheets, scale 1:65,000.

Venable, B.W., 1963, Mining at the Palo Verde mine: Mining Congress Journal, v. 49, no. 1, p. 14-18.

Tyrrell, W.W., Jr., 1957, Geology of the Whetstone Mountain area, Cochise and Pima Counties, Arizona: New Haven, Conn., Yale University, Ph.D. dissertation, [236 p.], 8 sheets, scale 1:62,500, 31,680, 1:125,000, and 1:528,000.

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