TY  - PRO
AU  - Pollak,L.M.
AU  - Pham,H.N.
TI  - Classification of maize growing regions in the tropics
PY  - 1987///
KW  - Sampling
KW  - Tropical zones
KW  - Varieties
KW  - AGROVOC
KW  - Zea mays
T2  - North Central Region Corn Breeding Sessions. Rosemont, Ill.
ER  -