British International Helicopters - An early history
Helicopter international ; 21 , 4
1998
Aufsatz (Zeitschrift)
Unbekannt
Engineering Index Backfile | 1944
Engineering Index Backfile | 1944
Bristow Helicopters -- An early history
Online Contents | 2003
Westland's all-British helicopters
Engineering Index Backfile | 1964
|TIBKAT | 1984
|