TY  - BOOK
ED  - American Society of Agronomy. Madison, Wis.
TI  - Challange to agronomy for the future
T2  - ASA special publication
U1  - 338.9 
PY  - 1967///
CY  - Madison
PB  - The Society
KW  - Agricultura
KW  - Estudio y ensenanza
KW  - EducaciÃ³n agrÃ­cola
KW  - PolÃ­tica agrÃ­cola
KW  - Suelos
KW  - Estudio y enseÃ±anza
N1  - 36-60
ER  -