Cunningham, William P. <br/><br/>
Principles of environmental science :  inquiry and applications / 
William P. Cunningham, Mary Ann Cunningham. 
 - 4th ed. 
 - New Delhi :  Tata McGraw-Hill,  2008. 
 - xviii, 428 p. 
<br/><br/><label>ISBN: </label>0070647720 (tata McGraw-Hill): 0071101942 (McGraw-Hill): 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental sciences.