ecology and environment and pollution 
S.S. Purohit & R. Ranjan 
 - New Delhi :  Today and Tomorrow's Printers & Publishers,  2007 
 - 1023 p. :  ill., map ;  25 cm. 
<br/><br/><label>ISBN: </label>81-7754-196-2 
<br/><br/><label>Dewey Class. No.: </label>577