Beneš-Mráz Be-56 Beta-Major
Unknown author<span style="display: none;">Unknown author</span>
1936-04-15
Letectví, Vol. XVI. (1936), No. 4 (April), p. 127, <a rel="nofollow" class="external free" href="https://kramerius.army.cz/search/i.jsp?pid=uuid:1f870ff4-5efe-11e9-a9e8-005056b73ae5">https://kramerius.army.cz/search/i.jsp?pid=uuid:1f870ff4-5efe-11e9-a9e8-005056b73ae5</a>