@INBOOK {COUPER: 1986, title = {Agronomic problems with large scale mechanized land development and farming in West Africa}, author = {Couper, D. C. and Lal, R. and Claassen, S. L. }, year = {1986}, type = {Land Clearing and Development in the Tropics edited by R. Lal, P.A. sanchez and R.W. Cummings, Rotterdam, A. Balkema}, pages = {149--158}, }