Helicopter International 

, United Kingdom 
 -  Avia Press, UK 
 - Bimonthly 
 - From : Vol 20 No 4 Jan/Feb 97 - 
<br/><br/><br/>English 
<br/><br/><label>ISSN: </label>0143-1005 
<br/><br/><label>Source: </label>83300643  Swets Blackwell