ऊर्जा आज या कल 
 Uja aaj or kal  

 - Delhi:   Bharti Art Prints,   1994 
 - 146p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science 
<br/><br/><label>Universal Decimal Class. No.: </label>620.91  / N7