Balloons in Warfare: From Japanese Bomb Balloons to Chinese Spy Balloons

China's spy balloon: inflatable eyes in the sky have been used in war for centuries

Why the Chinese spy balloon has been so unsettling for Americans.

What's Behind the Chinese Spy Balloon

WWII bomb over Dundee a reminder of Nebraska's rich, war history

What was the 'China spy balloon'? Why were the US worried?

China conducted spy balloon program for years, Pentagon says

Suspected Chinese spy balloon shot down over Atlantic was taller than the Statue of Liberty - CBS News

A Brief History of Spying With Balloons - The New York Times

Why the Chinese balloon crisis could be a defining moment in the new Cold War

Spy Balloons Are Also the New Secret Weapon of the United States

Japanese Vengenance Balloon Bombs of World War II - J. David Rogers

What we know and don't know about the China balloon

From the Archives: Chinese spy balloon sparks echos of Japanese balloon bombs during WWII. - The San Diego Union-Tribune