@PROCEEDINGS {LAWSON:1979, title = {Climate and soil conditions in semi-arid regions of West Africa with special reference to maize production}, author = {Lawson, T. L. and Juo, A. S. R. }, booktitle = {First SAFGRAD Maize Workshop, Ouagadougou, February 20-23,1979}, year = {1979}, month = {February}, }