Roy, G. D. <br/><br/>
Apramparik urja strot / 
G. D. Roy 
 - New Delhi :  Standard Publishers Distributors,  2014. 
 - 355 p. :  ill. ;  20 cm. 
<br/><br/><label>ISBN: </label>8186308296 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Engineering 
<br/><br/><label>Dewey Class. No.: </label>621.47  / ROY/A