"Asimov, Isaac" <br/><br/>
Foundation and empire 

 - New York  Avon Books  c1952 
 - 224p. : ill. ;18cm. 
<br/><br/><label>ISBN: </label>0380397013 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fiction--Life on other planets<br/>Psychohistory--Fiction.