Singh, J. S., Singh, S. P. & Gupta, S. R. <br/><br/>
Ecology environmental science and conservation 

 - New Delhi  S. Chand & Co.  2015 
 - xiv, 929p. 
<br/><br/><label>ISBN: </label>9789383746002(pbk) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography
<br/><br/><label>Dewey Class. No.: </label>U 20