FAO fertilizer yearbook 

 - Rome  Food and agriculture organsitation         1986 
 - 156p  cm. 
 - FAO Statistics series no.71 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>X9(J:2,4).1.N85, M6.35