Root crops for food security in Africa :  proceedings of the fifth triennial Symposium of the International Society for Tropical Root Crops--Arfica Branch, held in Kampala, Uganda, 22-28 November 1992 / 
edited by M.O. Akoroda. 
 - Ibadan, Nigeria :  International Society for Tropical Roots Crops, African Branch,  c1994. 
 - 452 pages  maps, ill. ;  25 cm.