Kumar, Devender  <br/><br/>
विज्ञान जगत 
 Vigyan Jagat  

 - New Delhi:   Vigyan Bharti,   1990 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science 
<br/><br/><label>Universal Decimal Class. No.: </label>5/6 N0