000			00277nam a2200085Ia 4500
008			130123s9999 xx 000 0 und d
082			_a631.7
245			_aJournal of Irrigation and Drainage Engineering Vol.115 No.1-6
260			_aNew York _bAmerican Society of CivilEngineers, _c1989
999			_c77691 _d77691