00349nam a2200157Ia 4500008004100000041001200041082001000053082001100063100002300074100001100097245004300108260000600151260000800157260000900165650001700174150909s9999    xx            000 0 und d  aEnglish  a631.4  bSIL/TR  aSillaanpaa Mikko    eAuthor  aTrace elements in soil and agriculture  a-  bFAO  c1979  aSoil science