International and national outlook; the necessity for efficient nutrient utilization 

 - Madison, Wis.,  1975 
 - 75 p.  ; gráfs 
 - Special publication  ; 25 .
 - Special publication  ; 25 .
<br/><br/><label>LCCN: </label>19558 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilizantes--Aspectos económicos.
<br/><br/><label>Dewey Class. No.: </label>631.8  / A5