003750000a22001570004500650002000000082002200020530000600042100001800048245006600066260003600132260000900168041000800177300000900185942000800194999001500202  aWater economics  a333.91bL948acUN  aM  aLovei, Laszlo  aAn approach to the economic analysis of water supply projects  aWashington,D.C.bThe World Bank  c1992  aEng  a37p.  cGEN  c6892d6892