Lal, Ratan---(et.al)  x <br/><br/>
Soil degradation in the united states  extent, serverity, and trends 

 - x 
 - London  Lewis pub.  2004 
 - 204 
<br/><br/>x 
<br/><br/><label>ISBN: </label>1566705347 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil degradation-United states Soil Science 
<br/><br/><label>Dewey Class. No.: </label>333.70973/S683