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WaterQualityWatch -- Continuous Real-Time Water Quality of Surface Water in the United States
Nimmick, D.A., 2004, Monitoring Surface-Water Quality in the Tongue River Watershed, http://tonguerivermonitoring.cr.usgs.gov/projects/fs3011.pdf
Cannon, M.R., Nimick, D.A., Cleasby, T.E., Kinsey, S.M., and Lambing, J.H., 2007, Measured and estimated sodium-adsorption ratios for Tongue River and its tributaries, Montana and Wyoming, 2004-06: U.S. Geological Survey Scientific Investigations Report 2007-5072, 45 p. http://pubs.usgs.gov/sir/2007/5072/ http://pubs.water.usgs.gov/sir/2007/5072
Link to the State's surrogate website.