Keys to soil taxonomy 
United state department of agriculture 
 - 7a 
 - 643 p  il  23 cm 
<br/><br/> Incluye: Indice 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suelos - Taxonomia
<br/><br/><label>Dewey Class. No.: </label>632.44  / KEY