Yeoman, R. S. <br/><br/>
Blue Book of United states Coins :  1968 Handbook of United states Coins with premium list.  [electronic resource]  
 Handbook of United States Coins with premiun List. 

 - Racine, Wis. :  Whitman Pub. Co.,  1967. 
 - 126 p. 
<br/><br/> Cover title: addition to the 246 title, there is"1968 Blue Book Siler anniveary edition."