Willis, C.F., 1920, Kay Copper Company: Arizona Mining Journal, v. 3, no. 11, p. 16-17, 66-67.
Willis, C.F.
Arizona Mining Journal, v. 3, no. 11, p. 16-17, 66-67.
Mineral District, Massive Sulfide, Copper, Gold, Silver, Mineralization, Subsurface, History, Production, Proterozoic,
