01357nam 2200349 450 991071685040332120210930104523.0(CKB)5470000002525682(OCoLC)1269630005(OCoLC)995470000002525682(EXLCZ)99547000000252568220210930d1998 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierWater quality in the Potomac River basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-96 /by Scott W. Ator [and six others][Reston, Virginia] :U.S. Department of the Interior, U.S. Geological Survey,1998.1 online resource (38 pages) color illustrations, color mapsU.S. Geological Survey circular ;1166Includes bibliographical references (pages 34-36).Water qualityPotomac River WatershedWater qualityAtor Scott W.1386575Geological Survey (U.S.),GPOGPOBOOK9910716850403321Water quality in the Potomac River basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-963462831UNINA