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[Balloon notes] (1917)
United States. Army Division of Military Aeronautics · leaf 299
![An illustration from [Balloon notes], 1917, leaf 299](https://img.insideoutlibrary.com/img/1024/ia-balloonnotes02unit-299-0.webp)
PLATE IL (59)Balloons · Aeronautics, Military
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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