A. M. Rawn, “Chemical Treatment Featured at Arizona Sewage Meeting,” Water Works and Sewerage, July 1937, pp. 277-278.

PDF version (printer-friendly).

Plans Established to Build a Sewer,” The SUN, Flagstaff, Arizona, Friday, October 31, 1969, p. 11 – original article from SUNfiles news archive, December 30, 1899.

Laura Fairbanks (Pima County Wastewater Management Dept.), “Sewer Collapse Causes Sinkholes in Tucson, Arizona, on September 7, 2002.”