Spherical ballooning, some of the requirements (1917)
McCullough, Paul James, 1881- · Saint Louis, The Mangan printing company · leaf 53
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Balloons
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
![An illustration from The American archaeologist [serial] (1898)](https://img.insideoutlibrary.com/img/200/ia-americanarchaeol02colu-30-32.webp)
