Gustafson, A.F. <br/><br/>
Conservation of the soil 

 - First 
 - Mcgraw-Hill  Book Company  New York  1937 
 - 312p.  ill. 
<br/><br/><label>Nat. Bib. No.: </label>2048 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture
<br/><br/><label>Universal Decimal Class. No.: </label>631.45  / GUS