Botkin, Daniel B.  <br/><br/>
Paperback 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/><br/>	<br/>Includes index.<br/>