"Rana, S V S" <br/><br/>
Essentials of Ecology and Environmental Science 

 - \\200300ENGGPCX 
 - Phi Learning Pvt Ltd   2003  New Delhi  
 - 368p. 
<br/><br/> includes index and biblioraphy 
<br/><br/><label>ISBN: </label>8120323203