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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8799373

Returning from a U-Boat scouting party. Aerial naval observer coming down from a "Blimp" type balloon after a scouting tour somewhere on the Atlantic Coast. Central News Photo Service., ca. 1918. Original public domain image from Flickr

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Returning from a U-Boat scouting party. Aerial naval observer coming down from a "Blimp" type balloon after a scouting tour somewhere on the Atlantic Coast. Central News Photo Service., ca. 1918. Original public domain image from Flickr

More