Asthana, D. K <br/><br/>
Textbook of environmental studies 
D. K. Asthana 
 - New Delhi  S. Chand & Company Pvt. Ltd.  2006 
 - xvi, 397p. 
<br/><br/><label>ISBN: </label>9788121927642 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pollution<br/>Biodiversity<br/>Natural resources
<br/><br/><label>Dewey Class. No.: </label>363.7 As83t