TY  - BOOK
ED  - Department of Agriculture, US
TI  - Agriculture and the environment: the 1991 yearbook of agriculture
U1  - 630.973 
PY  - 1991///
CY  - Estados Unidos
PB  - US Gobernment Printing Office
KW  - Agricultura
KW  - Estados Unidos
N1  - Incluye: Bibliografía e índice
ER  -