000 00276nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aMartin (John. H)
245 0 _aPrinciples of field crop
260 _bHarper & Row
260 _c1973
365 _b92.16
942 _cBK
999 _c207796
_d207796