Rattan Lal; Thomas Iivari; John M. Kimble; Rattan Lal <br/><br/>
Soil Degradation in the United States  Extent, Severity, and Trends 

 -  Taylor and Francis  2003 
<br/><br/><label>ISBN: </label>9780429209765 
<br/><br/><label>Source: </label>EBOOK