Singh, Ashok Kumar <br/><br/>
Science and technology for civil services examinations 

 - New Delhi  McGraw Hill Education  2014 
 - viii, 646p. 
 - McGraw Hill Education winning edge series .
<br/><br/><label>ISBN: </label>9780070655485 
<br/><br/><label>Dewey Class. No.: </label>500  / S48S