na INLIS000000000005808 Ind 0010-1118005808 631.347 W.Bart Snellen Irrigation scheme operation and maintenance SNELLEN, W. Bart Rome FAO 1996 vi, 48 p.: ill.; 29 cm.-- vi, 48 p.: ill.; 29 cm.-- IRRIGATION SCHEMES MAINTENANACE EQUIPMENT 166/FAO/97