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Rare photographs of military observation balloons of World War I, 1914-1918 - Rare Historical Photos
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Nicolai Eberholst (Pike Grey 1914-1918) on Twitter: "Austro-Hungarian hot-air observation balloon on the Italian Front, 1916. Spherical balloons like this were generally considered obsolescent at this time compared to the newer aerodynamic
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Rare photographs of military observation balloons of World War I, 1914-1918 - Rare Historical Photos
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