Gopalkrishnan,K.V. <br/><br/>
Inventors who revolutionised our lives   English  

 - Reprint  
 - New delhi   National book trust   2017 
 - 198p.  Paperback  
<br/><br/><label>ISBN: </label>9788123747668 
<br/><br/><label>LC Class. No.: </label>954.054 
<br/><br/><label>Dewey Class. No.: </label>954.054