Gopalakrishnan N <br/><br/>
Bharatiya sasthra ratnagal(Malayalam) 

 - 3 
 - Trivandrum  Heritage Publications  1999 
 - 34p. : ill. ;21cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>"Science, Ancient--Malayalam"<br/>Science--India--History