Babcock, J.A., and Hix, G.L., 1982, Annual static water level basic data report, Tucson Basin and Avra Valley, Pima County, Arizona, 1981, with a section on Aquifer compaction, by S.R. Anderson and others: City of Tucson, Arizona, Tucson Water, Planning Division, [125] p., 4 sheets, scale 1:126,720.
