[1] (in Polish) Belcarz, 2001, p.298 Bell 412 opuścił Okęcie. (in Polish) [2] (in Polish) Cynk, 1971, p.186-200 Cynk, 1971, p.151- Cynk, 1971, p.158-172...
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412–413. Alpert 1994, p. 14. Alpert 1994, pp. 20–23. Alpert 1994, p. 43. "Potez 540/542". Archived from the original on 11 August 2011. Alpert 1994, pp...
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