Prof.SHARMA AJAY K <br/><br/>
U P S C CIVIL SERVISES(PRE) PHYSICS 

 -  Arihant Publications, Meerut   2010 
<br/><br/><label>ISBN: </label>9788183482066 
<br/><br/><label>Dewey Class. No.: </label>150.194 4  / PRO/U