TY  - BOOK
ED  - Yearbook of Agriculture. 1991
TI  - Agriculture and the environment
U1  - 630.5 
PY  - 1991///
CY  - Washington, D.C.
PB  - Department of Agriculture
KW  - Agricultura
KW  - E.U.A
KW  - Investigacion
KW  - Medio ambiente
KW  - Investigación
KW  - Plantas
KW  - Efecto del medio ambiente
ER  -