Gustafson A.F. <br/><br/>
Conservation of the Soil. 

 - 3rd rev. 
 -  McGraw-Hill  1937 
 - xvii,312p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics
<br/><br/><label>Dewey Class. No.: </label>330  / GUS