Kohnke, Helmut <br/><br/>
Soil conservation / 
Helmut Kohnke 
 - New York :  McGraw-Hill Book Company,  1959 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural engineering
<br/><br/><label>Dewey Class. No.: </label>631.45  / KOH