Keys to soil taxonomy 
/by Soil Survey Staff 
 - 6 ed. 
 - Washingon, D.C. :  Soil Conservation Service,  1994. 
 - 306 p. :  ilus. ; gráfs. 
<br/><br/><label>LCCN: </label>80377 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suelos--Clasificación.
<br/><br/><label>Dewey Class. No.: </label>631.44  / E8 1994