text Colombo IIMI 1989 eng vii, 48 p. : ill. ; 30 cm. International Irrigation Management Institute IRRIGATION WATER MANAGEMENT 631.67 631.67 INT s 92-9090-104-7 220530 20220530023436 INLIS000000000003389 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)