TY  - BOOK
AU  - Whitney,Robert S.
TI  - Challenge to agronomy for the future.
T2  - Special publication / American Society of Agronomy
PY  - 1967///
CY  - Madison, WI
PB  - American Society of Agronomy
KW  - Agronomía
N1  - Incluye bibliografía
ER  -