On the track of discovery :  riddles of outer space : scientists untravel mysteries : secrets of history / 
[translated from the russian by D. Skvirsky and V. Talmi]. 
 - Moscow:   Progress Publishers,   [1964].  
 - 190 p. :  ill. ;  21 cm. 
<br/><br/><label>Dewey Class. No.: </label>608