Asthana D.K. and Asthana Meera <br/><br/>
A textbook of environmental studies /  
D.K. Asthana and Meera Asthana 
 - New Delhi :  S. Chand & Company Ltd.,  2006. 
 - 397 p. 
<br/><br/><label>ISBN: </label>8121927641 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental studies
<br/><br/><label>Dewey Class. No.: </label>333.707 ASTA