TY  - BOOK
AU  - Tripp,Robert,(ed)
TI  - Planned change in farming systems: progress in on-farm research
SN  - 0471934178
AV  - S540.O53  P58 1991
U1  - 630.7 22nd ed.
PY  - 1991///
CY  - Chichester
PB  - John Wiley
KW  - Agricultural systems
KW  - Developing countries
KW  - Farm management
N1  - Includes bibliographical references and index
ER  -