Effects of Agriculture and Urbanization on Quality of Shallow Ground Water in the Arid to Semiarid Western United States, 1993

Scientific Investigations Report 2007–5179

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5179

Figure - refer to figure caption for alternative text description

Figure 16. Relation among iron, nitrite, and dissolved-oxygen concentrations in ground-water samples collected from agricultural areas within regional National Water-Quality Assessment Program study units in the arid to semiarid Western United States, 1993–2004.

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