TY  - BOOK
AU  - United States Agriculture (Deptt of-)
ED  - United States Agriculture (Deptt of-)
TI  - System theory applications to agricultural modelli
U1  - X9(J):(B).73.N7, L8 
PY  - 1978///
CY  - Washington
PB  - Govt Press         
KW  - Agriculture Labour
ER  -