Stream Sediment Chemistry Median-Value Maps by Population Density

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            Cu                             Pb                                Zn                               Hg

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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/pop_4.htm
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Last modified: 23:02:47 Sat 12 Jan 2013
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