Singh, Ashok Kumar <br/><br/>
Science & technology for civil services examinations 
by Ashok Kumar Singh 
 - New Delhi  MCGraw Hill Education  2016 
 - 646p. 
<br/><br/><label>ISBN: </label>9780070655485 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science<br/>technology
<br/><br/><label>Dewey Class. No.: </label>PKP YA6 Si64