USGS Circular 1350: Nutrients in the Nation's Streams and Groundwater

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How the figure was made:

This table is derived from Puckett (2004).

References cited:

Puckett, L.J., 2004, Hydrogeologic controls on the transport and fate of nitrate in ground water beneath riparian buffer zones: Results from thirteen studies across the United States: Water Science and Technology, v. 49, no. 3, p. 47–53, accessed June 17, 2010, at http://water.usgs.gov/nawqa/nutrients/pubs/wst_v49_no3/wst_v49_no3.pdf.