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Junkers F 13 - Wikipedia
Switzerland's JU-Air returns Junker F13 into service - ch-aviation
Junkers Ju 88 Volume 2: The Bomber at War - Day and Night Operations by William A. Medcalf: new (2014) | Hafa Adai Books
The Junkers Ju-187/287 dive bomber designed to replace the outdated Stukas already in service, also had a tailfin that folded downward so the rear gunner could shoot his heart away without worrying