TY  - BK
AU  - McCann,J.C.
TI  - Maize and grace:  Africa´s encounter with a New World Crop, 1500-2000
SN  - 0-674-01718-8
U1  - 633.1 MCC 
PY  - 2005///
CY  - Cambridge, MA (USA)
PB  - Harvard University Press, 
ER  -