Agrahari, Ravi  _ <br/><br/>
Science and technology for civil services preliminary and main examinations  _ 

 - 6th ed. 
 - Chennai  McGrawHill  2023 
 - 673 p.  PB  22 cm. 
<br/><br/><label>ISBN: </label>9789355322661 
<br/><br/><label>Subjects--Personal Names: </label>   _ 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Science and technology<br/>Civil services preliminary  main examinations
<br/><br/><label>Dewey Class. No.: </label>351.0765  / AGR