00399nam a2200145Ia 4500008004100000082001700041100001500058245002800073260005400101300000800155650001800163650004200181653001600223653001400239170901s1967    xx            000 0 und d  a551.49bW19P  aWard, R.C. 0aPrinciples of Hydrology  aLondonbMcGraw-Hill Publishing Company Ltd.c1967  a403  aPure Sciences  aScience of the earth and other worlds  aGroundwater  aHydrology