Agrahari,Ravi P <br/><br/>
Science and technology :   for civil services preliminary and main examination/ 
Ravi P Agrahari. 
 - 3rd ed. 
 - Chennai :    McGraw Hill Education,  2020. 
 - xxii, e.13 p.; 
<br/><br/><label>ISBN: </label>9789353167684 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science and technology<br/>civil services 
<br/><br/><label>Dewey Class. No.: </label>600.076   / AGR