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Scientific Investigations Report 2007–5179

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

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Figure 7. Effect of land use on the percentage of detections following recensoring of nutrient data sets (A) for entire data set and (B) after removing replicate analyses, retaining only the most recent analysis from 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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