Harpstead, Milo I. <br/><br/>
Soil science simplified 

 - Ames :  Iowa State University,  1980 
 - 121 p.  : ilus. 
<br/><br/><label>LCCN: </label>73937 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suelos.
<br/><br/><label>Dewey Class. No.: </label>631.4  / H36