Barkakati,Dipak Kumar <br/><br/>
Doorway to science/by Dipak Kumar Barkakati 

 - New Delhi  Children's book trust  1992 
 - 46p. 
<br/><br/><label>ISBN: </label>8170115442 
<br/><br/><label>Dewey Class. No.: </label>500  B247D