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keyword: Aeronautics -- History – 4 free books.
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Die Brüder Wright Eine Studie ueber die Entwicklung der Flugmaschine von Lilienthal bis Wright
A. (Alfred) Hildebrandt
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Evelyn Charles Vivian and W. Lockwood (William Lockwood) Marsh
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The Dominion of the Air: The Story of Aerial Navigation
John M. (John Mackenzie) Bacon
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