Polish aviators - winners of International Touring Aircraft Contest <i>Challenge</i> 1934: pilot Jerzy Bajan (left) and mechanic Gustaw Pokrzywka (right) with Marshal Józef Piłsudski (center)
Unknown author<span style="display: none;">Unknown author</span>
1934
Marian Romeyko (editor): <i>Polska lotnicza</i>, Warsaw 1937