000 00334nam a2200121Ia 4500
008 180721s9999 xx 000 0 und d
100 _a"Hexem, Roger. W & Heady, Earl. O"
245 0 _aWater production functions for Irrigation agriculture
260 _bThe Lowa state university
260 _c1978
365 _b0.00
942 _cBK
999 _c151364
_d151364