Gehrs, John H. <br/><br/>
Soils and crops 

 - rev. ed. 
 - New York :  Mac-Millan,  1933 
 - 448 p.  : ilus. 
<br/><br/><label>LCCN: </label>12049 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cultivos.<br/>Suelos.
<br/><br/><label>Dewey Class. No.: </label>631.5  / G44