SYMPOSIUM on the utilization of secondary and trace elements <br/><br/>
The utilization of secondary and trace elements in agriculture: proceedings 
/organized by United Nations Economics Commission for Europe and the Food and Agriculture Organization of the United Nations, Geneva, 12-16 January, 1987 
 - Dordrecht  Martinus Nijhoff pub.  1987 
 - v, 299 p. 
<br/><br/><label>ISBN: </label>9024735467 
<br/><br/><label>Dewey Class. No.: </label>581.5  / SYM