Mahrotra, Narayan <br/><br/>
Pruthivi ki aayu 
/ by  Narayan Mahrotra 
 - U.P. :  Hindi Samiti,  1962 
 - 284p.; 18cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Dewey Class. No.: </label>550  / MAH-PR