TY  - BOOK
AU  - Huffman, Wallace E.
AU  - Evenson, Robert E.
TI  - Science for agriculture: : long-term perspective
U1  - 630.72073 
PY  - 1993///
CY  - Ames
PB  - Iowa State University Press
KW  - Agricultura
KW  - Aspectos economicos
KW  - E.U.A
KW  - Investigacion
ER  -