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Tableau des services postaux aériens. Offert gracieusement par l'"Indi...
Text-only broadside describes air mail postal services provided by balloon. Tissandier collection.
Public domain photo of a 3d object, Europe, free to use, no copyright ...
Public domain photo of a 3d object, free to use, no copyright restrictions image - Picryl description.
L'indicateur aérien. - Public domain portrait drawing
Picryl description: Public domain illustrated book page scan, drawings, free to use art, no copyright restrictions image.