Balchen , Bernt . <br/><br/>
The Next Fifty Years of Flight /  Textual Documents 
Bernt Balchen & Erik Bergaust. 
 - 1st ed. / 
 - New York :  The Viking Press ,  ©1960. 
 - 213p. :  ill ;  20cm . 
<br/><br/><label>Subjects--Index Terms: </label>Flight Aeroplane G-Technology 
<br/><br/><label>Dewey Class. No.: </label>629.13  / B 151 N