Gardner, Martin. <br/><br/>
Space puzzles :   curious questions and answers about the Solar Sys tem /  
Martin Gardner. 
 - New York :   Simon and Schuster,   1971. 
 - 95 p. :    ill., maps.;    24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Solar system.--------
<br/><br/><label>Dewey Class. No.: </label>523.2 GAR