00331nam a2200097Ia 4500008004100000082001900041100003600060245009300096260003700189300000700226140113s9999    xx            000 0 und d  a543:631.8   K3  aSociety of Analytical Chemistry  aDetermination of trace elements with special reference to fertilizers and feeding stuffs  a1963bW.Heffer & SonscCambridge  a39