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200 00$aWater resources data$iMaryland, Delaware, and Washington, D.C$b[electronic resource]
210   $aBaltimore, Md. $cWater Resources Division, U.S. Geological Survey
215   $a8 volumes $cdigital, PDF files
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606   $aStream measurements$zMaryland$vStatistics$vPeriodicals
606   $aStream measurements$zDelaware$vStatistics$vPeriodicals
606   $aStream measurements$zWashington Metropolitan Area$vStatistics$vPeriodicals
606   $aWater quality$zMaryland$vStatistics$vPeriodicals
606   $aWater quality$zDelaware$vStatistics$vPeriodicals
606   $aWater quality$zWashington Metropolitan Area$vStatistics$vPeriodicals
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712 02$aGeological Survey (U.S.).$bWater Resources Division.
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