Gardner, Martin, <br/><br/>
Puzzling questions about the solar system / 
Martin Gardner ; drawings by Ted Schroeder. 
 - Mineola, N.Y. :  Dover Publications,  1997. 
 - 96 p. :  ill. ; 
<br/><br/> Rev. and enl. ed. of: Space puzzles. 1971.  Includes index. 
<br/><br/><label>ISBN: </label>0486294404 (pbk.) 
<br/><br/><label>Subjects--Index Terms: </label>Solar system  
<br/><br/><label>Universal Decimal Class. No.: </label>51:523  / GAR