TY  - BOOK
AU  - Onwueme,I.C.
TI  - The tropical tubers crops: yams, cassava, sweet potato and cocoyams 
SN  - 0471996084
U1  - 635.2 
PY  - 1978///
CY  - New York
PB  - John Wiley, 
KW  - CULTIVOS TROPICALES
ER  -