Kumar,Vinay. <br/><br/>
Science And Technology Question Bank For Civil Services Preliminary Examination / 
Kumar,Vinay. 
 - 4th ed 
 - 357,p ; 24 cm. 
<br/><br/><label>ISBN: </label>9789355320025 
<br/><br/><label>Dewey Class. No.: </label>509.076