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200 10$aCentury-scale perspective on water quality in selected river basins of the conterminous United States /$fby Edward G. Stets [and four others]
210  1$aReston, Virginia :$cU.S. Department of the Interior, U.S. Geological Survey,$d2012.
215   $a1 online resource (viii, 108 pages) $cillustrations
225 1 $aScientific investigations report ;$v2012-5225
300   $aTitle from title screen (viewed Jan. 9, 2015).
300   $a"National Water-Quality Assessment Program."
320   $aIncludes bibliographical references (pages 99-107).
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606   $aWater$xPollution$zUnited States
606   $aWater quality$xStandards$zUnited States
606   $aWater quality$xResearch$zUnited States
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