000 00324nam a2200133Ia 4500
008 130225s9999 xx 000 0 und d
100 _aNorman, A.G.
245 _aOrganic matter in Iowa soils
260 _aAmes
_c1943
300 _a828-848 p.
440 _aIowa Agricultural Experiment
901 _a16728
942 _cB
_2udc
999 _c2004
_d2004