00392nam a2200133Ia 4500008004100000082002400041100004200065245004600107260002000153300001300173600002100186600002400207650002700231130903s9999    xx            000 0 und d  a633.002:631.816  K2  a Moyle S.Williams and John W.Conston.  aCrop production levels and fertilizer use  aRomebFAOc1962  axiv,48p.  aConston, John W.  aWilliams, Moyle, S.  aFertilizers,Crop yield