Tiwari, Ram kumar <br/><br/>
Jansankhya bhugol 

 - Allahabad    Pravalika Pabli.  2017 
 - 341 
<br/><br/><label>ISBN: </label>97893842920508 
<br/><br/><label>Dewey Class. No.: </label>304.6  / ram j