000			00447nam a2200157Ia 4500
008			170101s1991 xx 000 0 und d
082			_a630.72 T78P
100			_aTripp, Robert
245		0	_aPlanned change in farming systems: progress on farm research
260			_aChichester _bWiley _c1991
300			_a24cm. 348
650			_aAGRICULTURAL RESEARCH
653			_aAGRICULTURAL RESEARCH
653			_aAGRICULTURAL SYSTEMS
942			_2ddc _cB
999			_c103439 _d103439