Western fertilizer handbook 
produced by Soil Improvement Committee California Fertilizer Association 
 - 6ª ed 
 - Danville (Illinois)  Interstate  1980 
 - 269 p.  il. col. y n.  20 cm 
<br/><br/><label>ISBN: </label>0813421225 
<br/><br/><label>Subjects--Index Terms: </label>Abonos