00427    a2200121   4500082001900000245007300019260006600092300002000158440004100178650002800219650002500247650003300272  a333.91311bINT  aThe integrated management of major irrigation schemesban assessment  aColombobAgrarian Research and Training Institutec1991g1991  avii,183p.c21cm  aResearch study No.87 , December 1991  aOther natural resources  aWater for irrigation  aEconomics of land and energy