00430nam a2200169Ia 4500008004100000020001800041041000800059082001900067100002300086245002800109260003400137300000800171365001600179650002500195650002200220700001800242140306s9999    xx            000 0 und d  a0 8213 2882 4  aeng  a333 .7bSER/VA  aSenageldin, Ismail  aValuing the environment  aWashingtonbWorld Bankc 1994  a192  bU.S.D.18.95  aEconomic development  anatural resources  aSteer, Andrew