Soil 

 - Washington :  Goverment Printing Office,  1957 
 - 784 p.  : ilus. 
<br/><br/><label>LCCN: </label>66122 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suelos.<br/>Suelos--Conservación--E.U.A.
<br/><br/><label>Dewey Class. No.: </label>630.5  / Y4 1957