Novikov, E. <br/><br/>
A Planet of riddles / 
by E. Novikov ; translated from the Russian by David Sobolev 
 - Moscow :  Mir Publishers,  1972 
 - 256 p. :  ill. ;  17 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Planet, riddles
<br/><br/><label>Dewey Class. No.: </label>550