Yakovlev AIR-4 (1930)
neznámý (unknown)
1950-09-18
Letectví, Vol. 26., No. 9, p. 444, <a rel="nofollow" class="external free" href="https://kramerius.army.cz/search/i.jsp?pid=uuid:4fad7cd2-9ef0-11e9-8e03-005056b73ae5">https://kramerius.army.cz/search/i.jsp?pid=uuid:4fad7cd2-9ef0-11e9-8e03-005056b73ae5</a>