1. The agricultural supply price elasticity in Africa;Berthelemy;European Economic Review,1987
2. The farming systems perspective and farmer participation in the development of appropriate technology;CIMMYT Economics Staff,1984
3. Department of State (Sept. 1987). Unclassified telegram, Kinshasa. USDA/FAS copy, Washington, DC.
4. The effects of policy reforms on agricultural incentives in Sub-Saharan Africa;Jaeger;Amer. J. Agr. Econ.,1988
5. Properties and Management of Soils in the Tropics;Sanchez,1976