http://www.watersheds.org/places/extension/mississippi.htm
Ground water atlas of the US. http://pubs.usgs.gov/ha/ha730/ch_f/F-text1.html
Estimation of Nutrient and Sediment Loading in the Mississippi River and Great Lakes Basins with Regional SPARROW Models
http://wi.water.usgs.gov/rna/9km30/
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