TY  - BOOK
ED  - American Society of Agronomy. Madison, Wis.
TI  - Agronomy in a changing world and research needs for the seventies
T2  - ASA special publication
U1  - 338.9 
PY  - 1971///
CY  - Madison
PB  - The Society
KW  - Agricultura
KW  - InvestigaciÃ³n
KW  - PolÃ­tica agrÃ­cola
KW  - PolÃ­tica alimentaria
N1  - 36-65
ER  -