O N V,  <br/><br/>
Aksharam 

 - Kottayam  NATIONAL BOOKSTALL  1978 
<br/><br/><label>Subjects--Uniform Titles: </label>--GENERAL STACK
<br/><br/><label>Subjects--Topical Terms: </label><br/>NATURAL SCIENCE& MATHEMATICS--EARTH SCIENCEGeneralia
<br/><br/><label>Dewey Class. No.: </label>550.6  / O NV-A