Trapp, R.A., and Harris, R.C., 1996, Bibliography of the San Carlos - Safford - Duncan Nonpoint-Source Management Zone: Arizona Geological Survey Open-File Report 96-20, 58 p.
Trapp, R.A., and Harris, R.C., 1996, Bibliography of the San Carlos - Safford - Duncan Nonpoint-Source Management Zone: Arizona Geological Survey Open-File Report 96-20, 58 p.
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