Gustafson, Axel Ferdinand. <br/><br/>
Conservation of the soil 

 - New York :  McGraw-Hill,  1937 
 - 312 p.  : ilus 
<br/><br/><label>LCCN: </label>16189 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Erosión.<br/>Suelos--Conservación.
<br/><br/><label>Dewey Class. No.: </label>631.45  / G88