Singh Ashok Kumar <br/><br/>
Science and Technology : for Civil Services Examinations 

 - Chennai  McGraw Hill Education (India) Private Limited  2017 
 - 646p 
<br/><br/><br/>ENGLISH 
<br/><br/><label>ISBN: </label>978-0-07-065548-5 
<br/><br/><label>Dewey Class. No.: </label>153.94  / SIN