na INLIS000000000002502 0010-0121000868 Drfat operation and maintenance and water management manual Bila Irrigation Project PT INDAH KARYA [s.n] [s.l] 1988 xii, 181 p. : ill ; 30 cm 631.67 631.67 WATER MANAGEMENT MANAJEMEN AIR IRIGASI IRRIGATION. 3607 3607