Asthana ,D.K <br/><br/>
A textbook of Environmental studies/ 

 - 1st ed 
 - New delhi  schanda & company  2006 
 - xvii, 460p  pbk 
<br/><br/><label>ISBN: </label>8121927641 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ecology
<br/><br/><label>LC Class. No.: </label>QH541.A8 2006