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Largest civilian UFO investigative group

Largest civilian UFO investigative group
Who
Mutual UFO Network (MUFON)
Where
United States
When
April 2014
The Mutual UFO Network (MUFON) is an American-based organisation that investigates UFO sightings. There are branches all over the world and more than 3,000 members. MUFON was started in May 1969.