NURE Water Sample Chemistry: median-value maps by population density:

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            Alkalinity                                     pH                                Specific Conductance

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Direct questions and comments to:

Gilpin R. Robinson

U.S. Geological Survey

Email grobinso@usgs.gov 

Phone (703)-648-6113

U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/2004/1026/FIGURES/nure_4.htm
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