00499nam a2200181Ia 4500 CTU_21452 210402s9999 xx 000 0 und d 333.9109545 P334 Paul W Paustian Canal irrigation in the Punjab Paul W Paustian New York Ams Press 1968 irrigation farming - economic aspects Minh, 980109 Trung tâm Học liệu Trường Đại học Cần Thơ