000 00337nam a2200133Ia 4500
082 _a333.91
_bDER
100 _aDe Ridder, N. A.
245 _aOptimum use of water resources.
260 _aWageningen
_bInternational Inst. for Land Reclamat
_c1977
300 _axii, 250p.
500 _aENG
700 _aErez, A.
999 _c24602
_d24602
650 _aWater-supply--Mathematical models
_aWater-supply--Simulation methods
_aIran
650 _aIrrigation--Mathematical models