Rai, Ajay. <br/><br/>
Vikas Objective Book of Knowledge / 
Ajay Rai. 
 - Vikas Publishers :  Ghaziabad :  1980. 
 - v, 210p. :  ill ; 20cm. 
<br/><br/> Index. 
<br/><br/><label>ISBN: </label>070690947X (PBK.) 
<br/><br/><label>Dewey Class. No.: </label>10453