TY  - PRO
AU  - Johnson,E.C.
TI  - Maize improvement
PY  - 1974///
KW  - Breeding
KW  - AGROVOC
KW  - Cultivation
KW  - Genetic variation
KW  - Land use
KW  - Production factors
KW  - Technical aid
KW  - Training programmes
KW  - Zea mays
KW  - Yields
N1  - Tables
T2  - World-Wide Maize Improvement in the 70's and the Role for CIMMYT; El Batan, Mexico; 22-26 Apr 1974.
ER  -