Kohnke, Helmut <br/><br/>
Soil conservation 
Helmut Kohnke and Anson R. Bertrand 
 - New York  McGraw-Hill  1959 
 - vii, 219p.; ill.; 23cm.- 
 - McGraw-Hill publications in the agricultural sciences; no.20 .
<br/><br/><label>Dewey Class. No.: </label>581.5  / KOH