The Shadow of the Eagle on Twitter: "Let see, the Northrop P-530 was a model that failed to sell, it became the P-600 and enter the LWF program as the YF-17 ,
Northrop YF-17 | Military Wiki | Fandom
Northrop P-61C Black Widow | Smithsonian Institution
Northrop P-530 Cobra Full Scale Mockup by fighterman35 on DeviantArt
The Survivors: Northrop YF-17 Cobra – The Unwanted Fighter with Quite a Legacy! – Aces Flying High