%C Aleppo, Syria %I International Center for Agricultural Research in the Dry Areas %D 1999 %L icrisat493 %T Efficient soil water use: the key to sustainable crop production in the dry areas of West Asia, and North and Sub-Shararan Africa: proceedings of the Workshop, Niamey, Niger, 26-30 April 1998 and proceedings of the Workhop, Amman, Jordon, 9-13 May 1999 %E N van Duivenbooden %E M Pala %E C Studer %E C L Bielders