000 00266nam a22001217a 4500
999 _c203906
_d203906
041 _aEnglish
082 _a630
_bNOR/AD
100 _aNorman A G
245 _aAdvances in agronomy Vol.19
260 _aLondon
_bAcademic press
_c1967
300 _a367p
942 _cREF