01598oam 2200469 450 991071597090332120210402103542.0(CKB)5470000002516384(OCoLC)681523049(OCoLC)621890494(OCoLC)667855344(OCoLC)974647334(OCoLC)1153329683(OCoLC)995470000002516384(EXLCZ)99547000000251638420101115d1992 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierAreal and temporal variations in surface-water quality in the upper Potomac River basin /by Thomas J. TrombleyTowson, Maryland :U.S. Geological Survey,1992.1 online resource (iv, 48 pages) illustrations, map +1 plateWater-resources investigations report ;89-4139Includes bibliographical references (pages 47-48).Water qualityPotomac River WatershedWater qualityfastUnited StatesPotomac River WatershedfastWater qualityWater quality.Trombley Thomas J.1402124Geological Survey (U.S.),OCLCEOCLCEOCLCQOCLCFOCLCQOCLCOOCLCQCOPGPOBOOK9910715970903321Areal and temporal variations in surface-water quality in the upper Potomac River basin3496249UNINA