The Mammoth mine at Youngsberg in the Superstition mining district, Pinal County, Arizona Author E. Tiller Article Date October 1921 Journal Title Ariz
Magma geologist describes early days of old mines Author R. G. Willson Article Date August 27, 1961 Journal Title Ariz Days & Ways
A mining report from Owl Heads Buttes Author R. E. Wilbur Article Date April 12, 1975 Journal Title Ole ( Tucson Daily Citizen)