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WaterQualityWatch -- Continuous Real-Time Water Quality of Surface Water in the United States
M.L. Clark and J.P. Mason, 2006, Water-quality monitoring and regression analysis for specific conductance and sodium-adsorption ratios and load estimates for dissolved solids for four sites in the Powder River Basin, Montana and Wyoming 2001-2004, 22 p. http://pubs.water.usgs.gov/sir2006-5113
Other publications may be found on the State's surrogate website.
Link to the State's surrogate website.