Botkin, Daniel B.  <br/><br/>
Environmental science: 	  earth as a living planet/  
Daniel B. Botkin and Edward A. Keller 
 - Fourth edition 
 - New York:   John Wiley and Sons Inc,   c2003. 
 - xxvii, 668 pages :   illustrations ;   25 cm 
<br/><br/>Includes index.<br/> 
<br/><br/><label>ISBN: </label>9814126985 (pbk.)