Keywords: Challenge 1929 Avia.jpg en The two Avia BH-11 aircraft with Walter Vega engines taking part in the Challenge International de Tourisme 1929 cs Letouny Avia BH-11 s motory Walter Vega Závod Okolo Evropy 1929 Letec magazine volume V issue 9 page 484 September1929 anonymous 1929 Anonymous-EU Challenge International de Tourisme 1929 Avia BH-11 Walter Vega Letec magazine |