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Extraterrestrial fever emerged in the 20th century during the 1960s, 70s and 80s, largely due to films, but years before, even in the 19th century, unexplained strange occurrences
History's Most Infamous UFO Sightings of the Modern Era
South Australia's X-Files: Curious Adelaide cracks open our most mysterious UFO cases - ABC News
The Most Credible UFO Sightings and Encounters in Modern History, According to Research
The 5 Most Credible Modern UFO Sightings
How UFO Reports Change With the Technology of the Times, History
The Gulf Breeze Sightings: The Most Astounding Multiple Sightings of Ufos in U.S. History: Walters, Ed, Walters, Frances: 9780688090876: : Books
UFO hearing: Recap of New Jersey's most famous sightings
Minnesota's most notorious UFO sighting remains a mystery four decades later
A UFO conspiracy theorist's search for the truth - Washington Post
Alien Encounters: The Most Important UFO Cases in History by Reality Entertainment - Radio/TV Program
UFO Report: No Sign Of Aliens, But 143 Mystery Objects Defy Explanation : NPR
How UFO Sightings and Alien Autopsies Became Serious News
10 places to see a UFO around the world – Lonely Planet - Lonely Planet
Area 51—facts and information
Pentagon UFO office unveils official website for reporting sightings