00273nam a2200097Ia 4500008004100000082002300041100004400064245001800108260004100126300000800167140113s9999    xx            000 0 und d  a631.416.1(02)   K5  a"Bartholomev, W.V. & Clark, Francis.E."  aSoil Nitrogen  a1965bAmerican Soc. AgronomycU.S.A.  a615