International Institute of Tropical Agriculture2007-11-121979-04-012007-11-121979http://hdl.handle.net/10625/7476Text1 digital file (3 p.)Application/pdfenRESEARCH PROGRAMMESPLANT BREEDINGROOT CROPSPLANTINGTROPICAL ZONEAFRICATissue culture : improved cultivars for Africa's National ProgramsWorking Paper