@PROCEEDINGS {HAHN:1978f, title = {The Improvement of Cassava and Sweet Potato through Breeding}, booktitle = {Paper presented at the IITA/IDRC/MANR/RRS Regional Root and Tuber Crops Improvement Workshop, August 28 - 30, 1978}, year = {1978}, month = {August}, address = {Freetown, Sierra Leone}, note = {RTB; Root and Tuber}, }