BICHITRA BIGYAN ARU ANANYA 

 - 1ST. 
 - GUWAHATI  PURBANCHAL PRAKASH  2017 
 - 363:  24CM. 
<br/><br/><label>Subjects--Index Terms: </label>Earth sciences 
<br/><br/><label>Dewey Class. No.: </label>550 BAR