000 00457nam a2200121Ia 4500
008 180413s9999 xx 000 0 und d
020 _a471934178
245 0 _aPlanned Change In Farming Systems Progress In On Farm Research Edited By Robert Tripp
260 _bChichester New York : J. Wiley Exeter Uk : Co-Publication With Sayce Pub. C1991.
300 _a348
546 _aEng
690 _aAgriculture - Research - On-Farm ; Agricultural Systems - Research.
999 _c31455
_d31455