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Aux sceptiques. - Public domain drawing
Picryl description: Public domain image of a biplane aircraft, pilot, aviator, free to use, no copyright restrictions.
Dessins orignaux de Léonard de Vinci, relatifs à ses études sur le vol...
Alexander Graham Bell Papers. Picryl description: Public domain image of a drawing of Leonardo DaVinci, free to use, no copyright restrictions.
Lettre du Ct Brocard, ancien chef de l'escadrille des Cigognes, remerc...
Public domain scan of 20th century French drawing, free to use, no copyright restrictions image - Picryl description