Umanah, E.E.2007-11-131977-04-012007-11-131977IDRC-080ehttp://hdl.handle.net/10625/19290Meeting: International Society for Tropical Root Crops Symposium, 4th, 1-7 Aug. 1976, Cali, COIn IDL-1335p. 137-141application/pdfenCassava research in Nigeria before 1972Book Chapter