World soil resources reports. 

 - Rome :  FAO,  1989- 
 - vols. 
<br/><br/> Nos. 64, 74, 79, 81, 82, 83, 84, 85, 86, 87, 89, 91, 92, 93, 94, 95, 96, 
<br/><br/><label>ISSN: </label>0532-0488 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils--Classification.<br/>Soils--Maps.