Singh, R. P. <br/><br/>
Environmental studies 
/ by R.P.Singh et al. 
 - 1st ed. 
 - New Delhi:  Concept publishing company,  2012. 
 - xvi,344p. 
<br/><br/><label>ISBN: </label>9788180697746 
<br/><br/><label>Dewey Class. No.: </label>304.2071054  / SIN/E