Gdansk , Poland : AJ - Press , 2001 .
Bell P - 6 Kingcobra , XFL - 1 Airabonita , P - 39 Airacobra ( Monografie Lotnicze 59 ) ( in Polish ) .
Gdansk , Polish : AJ - Press , 2001 .
Bell P - 6 Kingcobra , XFL - 1 Airabonita , P - 39 Airacobra ( Monografie Lotnicze 59 ) ( in Polish ) .