PUROHIT & AGARWAL. <br/><br/>
ECOLOGY AND  ENVIRONMENTAL 

 - [s.l]:  STUDENT EDITION,  2004. 
 - 644:  22CM. 
<br/><br/><label>Subjects--Index Terms: </label>Ecology 
<br/><br/><label>Dewey Class. No.: </label>577 PUR