000 00247nam a2200085Ia 4500
100 _aKononova, M.M.
250 _a1st
245 _aSoil Organic Matter : Its Nature, Its Role in Soil Formation and in Soil Fertility
260 _bPergamon Press Oxford
_c1961
082 _a631.417KON
999 _c320107
_d320107