Amelioration of soil by trees : guidelines for training in rapid appraisal for agroforestry research and extension Author(s) Abel, N. O. J. Drinkwater, M. J. Ingram, J. Okafor, J. Prinsley, R. T.
Wood usage and tree planting in Zimbabwe's communal lands : a baseline survey of knowledge, attitudes and practices Author(s) Du Toit, R. F. Campell, B. M. Haney, R. A. Dore, D.
