TY  - GEN
AU  - Vries , Frits Penning De 
AU  - Teng , Paul 
TI  - Systems approaches for agriculturaldevelopment
SN  - 0792318803
U1  - 630 
PY  - 1993///
CY  - Boston
PB  - Kulwer academic publishers
KW  - CROP PRODUCTION
KW  - SYSTEMS APPROACHES
KW  - AGRICULTURE
ER  -