TY  - BOOK
AU  - Sprague, George Frederick
TI  - Corn and corn improvement
T2  - Agronomy
U1  - 633.15 
PY  - 1977///
CY  - Madison, Wis.
PB  - American Society of Agronomy
KW  - Maíz
KW  - Mejoramiento
ER  -