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100   $a20101115d1992      ua             0
101 0 $aeng
135   $aurbn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aAreal and temporal variations in surface-water quality in the upper Potomac River basin /$fby Thomas J. Trombley
210  1$aTowson, Maryland :$cU.S. Geological Survey,$d1992.
215   $a1 online resource (iv, 48 pages) $cillustrations, map +$e1 plate
225 1 $aWater-resources investigations report ;$v89-4139
320   $aIncludes bibliographical references (pages 47-48).
606   $aWater quality$zPotomac River Watershed
606   $aWater quality$2fast
607   $aUnited States$zPotomac River Watershed$2fast
615  0$aWater quality
615  7$aWater quality.
700   $aTrombley$b Thomas J.$01402124
712 02$aGeological Survey (U.S.),
801  0$bOCLCE
801  1$bOCLCE
801  2$bOCLCQ
801  2$bOCLCF
801  2$bOCLCQ
801  2$bOCLCO
801  2$bOCLCQ
801  2$bCOP
801  2$bGPO
906   $aBOOK
912   $a9910715970903321
996   $aAreal and temporal variations in surface-water quality in the upper Potomac River basin$93496249
997   $aUNINA