TY  - GEN
AU  - Tripp , Robert 
TI  - Planned change in farming systems: progress in on-farm reseach
SN  - 0471934178
U1  - 630 
PY  - 1991///
CY  - England
PB  - John wiley 
KW  - AGRICULTURE
KW  - INCLUDED AN INDEX
ER  -