TY  - BOOK
AU  - Tripp,Robert
TI  - Planned change in farming systems: progress in on-farm research 
SN  - 0471934178
AV  - S540.O53P58 1991 
PY  - 1991///
CY  - New York
PB  - J. Wiley, Co-publication with Sayce Pub.
KW  - Agriculture
KW  - Research
KW  - On-farm
KW  - Agricultural systems
ER  -