root crops and the African food crisis : proceedings of the Third Triennial Symposium of the International Society for Tropical Root Crops--Africa Branch held in Owerri, Nigeria, 17-23 August 1986 International Society for Tropical Root Crops creator Terry, E. R. Akoroda, M. O. Arene, O. B. text Ottawa, Ont., Canada International Development Research Centre c1987 monographic iv, 197 p. ; 25 cm. Root crops Root crops Tropical crops Tropical crops Food supply 630 IDR 1987 C142 Co. 0889364982 (pbk.)