TY  - GEN
TI  - Agriculture and the environment : the 1991 yearbook of agriculture 
SN  - -
AV  - S 21
PY  - 1991///
PB  - U.S. Department of Agriculture
KW  - Agriculture - United States
KW  - Agricultural ecology - United States
KW  - Agriculture and state - United States
N1  - 23670
ER  -