01118cam a22002418a 4500020001500000040000800015082002600023100002300049245016400072246016200236260014100398300004900539490004800588500003400636650002100670650002400691650002400715700002200739710006200761710002900823942000700852999001700859  a0607870435  cDLC00a551 FOR 1997 A059 Or.1 aHinkle, Stephen R.10aComparison of chlorofluorocarbon age-dating with particle-tracking results of a regional ground-water flow model of the Portland Basin, Oregon and Washington /2 aComparison of chlorofluorocarbon age dating with particle-tracking results of a regional ground-water flow model of the Portland Basin, Oregon and Washington  aDenver, Colo. :bU.S. Dept. of the Interior, U.S. Geological Survey :bFor sale by Branch of Information Services [distributor],c[1997]  av, 47 p. :bill., maps (some col.) ;c28 cm.1 aU.S. Geological Survey water-supply paper ;  aShipping list no.: 97-0374-P. 0aGroundwater flow 0aGroundwater tracers 0aChlorofluorocarbons1 aSnyder, Daniel T.2 aIntergovernmental Resource Center of Clark County (Wash.)2 aGeological Survey (U.S.)  cEK  c14579d14579