000 00320nam a2200121Ia 4500
001 MPKV052497
008 120911s9999 xx 000 0 und d
082 _a631.4
245 _aCrops and Soils Vol 24
_c;
246 _aCrops and Soils Vol 24
260 _aUSA
_bAmerican Society of Agronomy
_c1972
650 _aSoil Science
999 _c50498
_d50498