Why did "Old Ones" leave our valley? Author R. Willson Article Date April 11, 1965 Journal Title Ariz Days & Ways
Prehistoric irrigation of the Casa Grande Ruins area Author F. Midvale Article Date February 1965 Article Abstract Contains map "Prehistoric irrigation canals, Gila River Valley, Pinal County, Arizona" Journal Title Kiva
Prehistoric irrigation in the Salt River Valley, Arizona Author F. Midvale Article Date October 1968 Journal Title Kiva
Prehistoric irrigation in Central Arizona Author O. S. Halseth Article Date January 1932 Journal Title Masterkey
Precolumbian engineering in Arizona Author R. E. L. Robinson Article Date March 1894 Journal Title Californian