The door into summer 
Heinlein, Robert A. 
 -  Ballantine Books.  1956 
 - 291 pages 
<br/><br/>
<br/><br/><label>ISBN: </label>0-345-33012-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fiction.
<br/><br/><label>Dewey Class. No.: </label>FIC H4689 1957