00522nam a2200121Ia 4500008004100000082003800041100012600079245008100205260003800286300001300324490004400337650001900381140224s9999    xx            000 0 und d  a631.416.9 1987.1.12/16 (082.2) M7  aSymposium on the Utilization of Secondary and Trace Elements in Agriculture. Geneva, Palais des nations, Jan.12-16, 1987.  aThe utilization of secondary and trace elements in agriculture; proceedings/  aDordrechtbMartinus Nijhoffc1987  avi,299p.  aDevelopments in Plant and Soil Sciences  aTrace elements