Scientific American <br/><br/>
Managing Planet Earth Readings From Scientific American Magazine 

 -  New York : W.H. Freeman And Company 1990. 
 - 146 
 - Advances In Soil Science Advances In Soil Science (Boca Raton  Fla.) .
<br/><br/><br/>Eng 
<br/><br/><label>ISBN: </label>0716721082 (Pbk)