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Scientific Investigations Report 2007–5179

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

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Figure 6. Percentage of nutrient detections following recensoring of nutrient datasets (A) for entire dataset, and (B) after removing replicate analyses, retaining only the most recent analysis at a given site, within regional National Water-Quality Assessment Program study units in the arid to semiarid Western United States, 1993–2004.

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