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Changes in Nutrient and Sediment Concentrations in Streams and Rivers of the United States, 1993-2003

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Changes in phosphorus and nitrogen inputs from fertilizer

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U.S. Department of the Interior | U.S. Geological Survey
URL: http://water.usgs.gov/nawqa/pubs/nutrient_trends/n-p_fertilizer.html
Page Contact Information: gs-w_nawqa_whq@usgs.gov
Page Last Modified: Wednesday, 09-Jan-2013 11:59:25 EST