KOHNKE HELMUT <br/><br/>
SOIL CONSERVATION 
ANSON R. BERTRAND 
 - NEW YORK  MCGRAW- HILL BOOK COMPANY  1959 
 - VII,  298P.  ILL  25CM. 
<br/><br/><label>Dewey Class. No.: </label>631.4`5096 KOH 1959