000			00352nam a2200169Ia 4500
999			_c237100 _d237100
041			_aEnglish
082			_a630
082			_bCAR/BI
100			_aCarlson S Peter
245			_aBiology of crop productivity
260			_aNew York
260			_bAcademic Press
260			_c1980
300			_a452 p.
650			_aCrop Production
942			_cBK