@PROCEEDINGS {LAL:1984h, title = {Soil erosion and degradation in the tropics and its control}, author = {Lal, R. }, booktitle = {Presented to the symposium Studies on the Impact of Agricultural Management in Farming Systems in the Tropics, 23-29 October, Adjaria, Kobuleti}, year = {1984}, publisher = {U.S.S.R.}, }