004320000a22001570004500650002000000650002000020650002100040082002200061530000600083100003300089245008500122260003700207260000900244041000800253300001300261  aWater economics  aWater resources  aWater management  a333.91bF872dcUN  aM  aFrederiksen, Harald D. 1930-  aDrought planning and water efficiency implications in water resources management  aWashington, D.C.bThe World Bank  c1992  aEng  aiii,38p.