Largest local sources of total nitrogen for Pacific Northwest (2002)

Largest local sources of total nitrogen for National Hydrography Dataset catchments in the United States Pacific Northwest (2002 conditions).

Wise, D.R., and Johnson, H.M., 2013, Application of the SPARROW model to assess surface-water nutrient conditions and sources in the United States Pacific Northwest: U.S. Geological Survey Scientific Investigations Report 2013–5103, 32p., http://pubs.usgs.gov/sir/2013/5103/.