Bennelt, Hugh Hammond <br/><br/>
Soil conservation / 
Hugh Hammond Bennelt, 
 - New York :  McGraw-Hill Book ,  1939 
 - xvii, 993 p. :  ill. ;  23 cm. 
 - Mcgraw- Hill series in geography .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sols--Conservation--États-Unis<br/>Soil conservation--United States