1. Developing a simple yet practical method of soil-loss estimation;Elwel;Tropical Agriculture,1982
2. Erosion-induced loss in soil productivity: trends in research and international cooperation;Stocking,1985
3. The threat of soil erosion to long-term crop production;Larson;Science,1983
4. Report on the Agro-ecological Zones Project. Volume 1 : methodology and results for Africa;FAO,1978
5. Atlas der Erosionsgefahrdung in Bayern;Auerswald,1986