Italian heavy bomber Caproni Ca.3 during flight
Unknown author<span style="display: none;">Unknown author</span>
before 1919 <div style="display: none;">date QS:P,+1919-00-00T00:00:00Z/7,P1326,+1919-00-00T00:00:00Z/9</div>
From the book Repülőászok 1914-1918, Zrínyi Kiadó, Budapest 2015, <a href="//commons.wikimedia.org/wiki/Special:BookSources/978_963_327_634_1" title="Special:BookSources/978 963 327 634 1">ISBN 978 963 327 634 1</a> First published during the World War I