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How UFO Sightings Went From Conspiracy Theory To A Serious Government Inquiry : NPR
A UFO ? What was that strange sight in sky over South Florida
UFOs: Natural Explanations – Pieces of History
Sorry, But It's Probably Not Aliens - So What Are Navy Pilots Seeing in the Skies?
Mysterious lights spotted in sky in northern India, leave many people puzzled
Do Records Show Proof of UFOs?
Why We're Suddenly Spotting Spy Balloons - Scientific American
Government UFO Report Won't Rule Out Visitors from Space, BU Today
On the dynamics of reporting data: A case study of UFO sightings - ScienceDirect
UFO Sightings Surge, Unidentified: Inside America's UFO Investigation (S2, E7)