00441nam a2200157Ia 4500008004100000020001500041082001700056100002300073245003000096260005000126300000800176650001800184650004200202653002400244653001500268170901s1977    xx            000 0 und d  a0470992239  a551.48bS24D  aSchumm, Stanley A. 0aDrainage Basin Morphology  aStroudsburgbDowden,Hutchinson and Rossc1977  a352  aPure Sciences  aScience of the earth and other worlds  aBasin hydrographics  aWatersheds