02277oam 2200601 450 991071671870332120210901093444.0(CKB)5470000002524992(OCoLC)682025678(OCoLC)622070692(OCoLC)667900631(OCoLC)985367107(OCoLC)1153329486(OCoLC)995470000002524992(EXLCZ)99547000000252499220101117d1998 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierPreliminary estimates of residence times and apparent ages of ground water in the Chesapeake Bay watershed, and water-quality data from a survey of springs /by Michael J. Focazio [and five others]Richmond, Virginia :U.S. Department of the Interior, U.S. Geological Survey,1998.1 online resource (vi, 75 pages) illustrations, maps (some color)Water-resources investigations report ;97-4225Includes bibliographical references (pages 52-55).Water qualityChesapeake Bay WatershedMeasurementSpringsChesapeake Bay WatershedGroundwaterQualityChesapeake Bay WatershedEcologyfastGroundwaterQualityfastSpringsfastWater qualityMeasurementfastChesapeake Bay WatershedEnvironmental conditionsUnited StatesChesapeake Bay WatershedfastWater qualityMeasurement.SpringsGroundwaterQualityEcology.GroundwaterQuality.Springs.Water qualityMeasurement.Focazio Michael J.1385146Geological Survey (U.S.),OCLCEOCLCEOCLCQOCLCFOCLCOOCLCQCOPOCLCAGPOBOOK9910716718703321Preliminary estimates of residence times and apparent ages of ground water in the Chesapeake Bay watershed, and water-quality data from a survey of springs3508262UNINA