Heinlein, Robert A.   frey50        <br/><br/>
Tunnel in the sky. 

 -  Ballantine Books  1955 
 - 214 p 
<br/><br/> It was just a test but something went wrong. A ten day survival test had suddenly become a life or death nightmare. Now they were stranded somewhere in the universe, beyond contact with Earth at the other end of the tunnel sky. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science Fiction
<br/><br/><label>Dewey Class. No.: </label>Hei   33