00441nam a2200145Ia 4500008004100000020001800041040001700059082002400076100001700100245007600117260003200193300001300225650004000238700001700278190327s9999||||xx |||||||||||||| ||und||  a0-1731-5707-0  aNITILcNITIL  221sta627.54bG793D  aGergory, K J 0aDrinage basin form and processba geomorhological approachcK J Gergory  aLondonbEdward Arnoldc1973  ax, 450p.  aDrainage; Water balance (Hydrology)  aWalling, D E