00268nam a2200121Ia 4500082002300000100001700023245003000040260002700070300001300097500002600110500000500136700000500141  a338.16317bC592.EI  aClark, Colin  aEconomics of irrigationb  aOxfordbPergamonc1967  ax, 116p.  aLib. has:- 1967, 1970  a  a