Varshney C K <br/><br/>
Environmental challenges 
Varshney C K; Sardesai D R 
 - New Delhi  New Delhi, Wiley Eastorn  1993 
 - viii,131 
<br/><br/><label>ISBN: </label>81-224-0525-8 
<br/><br/><label>Source: </label>Textbook