The History of Mining at Superior
Walker, Gladys and T.G. Chilton. 1991. The History of Mining at Superior, History of Mining in Arizona, vol. II, 231-36, edited by J. Michael Cantly and Michael N. Greely. Mining Club of the Southwest Foundation, Tucson.
The draft EIS public comment period closed November 7, 2019. All 30,000+ comment submittals are now under review for consideration in the compilation of the final EIS.