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SPARROW Surface Water-Quality Modeling
A modeling tool for the regional interpretation of water-quality monitoring data. Internet Archive URL: https://web.archive.org/web/2017*/http://water.usgs.gov/nawqa/sparrow -
USGS Surface Water Information
USGS Hydro-Climatic Data Network (HCDN-2009). This data set is very small, consisting of just an EXCEL file with information on USGS stream gage stations that are unaffected by...