00353nam a2200133Ia 4500008004100000041000800041082001600049100001100065245007200076260004200148300000800190365000700198650001400205210719s2001    xx            000 0 und d  aeng  a551.48 WATE  aWATER;  aWater the power promise and turmoil of north America's fresh water.  aWashingtonbNational Geographicc2001  a120  cRs  aHydrology