Littmann Mark, 1939 <br/><br/>
Planets beyond :  discovering the outer solar system / 
Mark Littmann. 
 - New York :  Wiley ,  1988. 
 - xiv, 286 p. :  ill. ;   24 cm. 
 - Wiley science editions .
<br/><br/>Includes bibliographies and index 
<br/><br/><label>ISBN: </label>104761128X 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Uranus(planet)<br/> Neptune(planet)<br/> Pluto(planet)