In this issue: Ground Water Resources: the Key to Combating Drought in Africa; Sustainable Development of Arid Lands through Irrigation; Some Agricultural Considerations in the Planning of Runoff Farming; Desert Encroachment; The Use of a Landsat-based Soil and Vegetation Survey and Graphic Information System to Evaluate Sites for Monitoring Desertification; Dynamics of Range Plants and Desertification Monitoring in the Sudan; etc.