Superworlds / 
by Joshua Strickland ; introd. by Erich von Däniken ; ill. by Gary Tong. 
 - New York :  Grosset & Dunlap,  c1975. 
 - 147 p. :  ill. ;  25 cm. 
 - 52 (NLA) .
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 142-143. 
<br/><br/><label>ISBN: </label>044811786X 0448132613 
<br/><br/><label>Universal Decimal Class. No.: </label>52 (NLA)