Beneš-Mráz Be-56 Beta-Major (2)
neznámý (unknown)
1937-06-15
Letetctví, Vol. XVII. (1936), No. 5-6 (May-June), p. 247, <a rel="nofollow" class="external free" href="https://kramerius.army.cz/search/i.jsp?pid=uuid:cf2a50ef-5f06-11e9-afe3-005056b73ae5">https://kramerius.army.cz/search/i.jsp?pid=uuid:cf2a50ef-5f06-11e9-afe3-005056b73ae5</a>