Ojiya Festivals - beyond the Hot Air Balloon Festival | Work in Japan for engineers
Incendiary balloon - Wikipedia
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Balloon Bombs
Japanese Fire Balloons Reach Utah During WWII · Utah Stories from the Beehive Archive
When Six Americans Were Killed By a 'Balloon Bomb' - FLYING Magazine
Amazon.com: Fu-go: The Curious History of Japan's Balloon Bomb Attack on America (Studies in War, Society, and the Military) eBook : Coen, Ross: Kindle Store
Fu-Go balloon bomb - Wikipedia
Northeast Japan pref. says origin of 'creepy' balloon-like UFO will stay a mystery - The Mainichi