Vigyan katha 

 -  1989 
 - 27p.  cm. 
<br/><br/><label>Standard No.: </label>266501 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>SCIENCE
<br/><br/><label>Dewey Class. No.: </label>Ax, 155M9