00267nam a2200097Ia 4500008004100000082002300041245004000064260003000104300001000134650002500144130903s9999    xx            000 0 und d  a631.67:33(047)  M0  aStudies in economics of irrigation.  aNew DelhibI.A.R.I.c1980  a126p.  aIrrigation-Economics