Negi, Balbir Singh. <br/><br/>
Practical Geography /  

 - 1st ed /  
 - Meerut-1 :   Kedarnath Ram Nath. 
 - p.240 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth Science
<br/><br/><label>Dewey Class. No.: </label>U  / [M4]