000 003030000a22001450004500
060 _a100
082 _a630.685 ADV.20
100 _aNorman, A G
245 _aAdvances in agronomy V 20
260 _aNewyork, Academic press
260 _c1968
300 _a379
650 _aAgronomy
942 _cBK
999 _c347929
_d347929