@PROCEEDINGS {TERRY:1980c, title = {The production of pathogen-free cassava planting material for distribution}, author = {Terry, E. R. }, booktitle = {Paper presented at the Cassava Outreach Workshop, PRONAM, Mvuazi, Zaire, 19-22 May, 1980}, year = {1980}, note = {RTB; Root and Tuber; Cassava}, }