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2. M. F. McNulty , 1983 . A Water Issue Primer for the Tucson Active Management Area . Arizona Department of Water Resources, 61 pp.
3. M. Milne , 1976 . Residential Water Re-Use . California Water Resources Center, Davis, California, 509 pp.
4. Pima County Wastewater Management Department (PCWWMD) , 1981 , Financial Report.