“David Marler, UFO researcher and author of ‘Triangular UFOs: An Estimate of the Situation’, says he has reviewed more than 17,000 case files involving unidentified triangular craft, sometimes called “black triangles.” Whether the sightings represent advanced U.S. spy craft—as some speculate—or something of unknown origin, their purpose remains mysterious.”
— “Huge, Hovering and Silent: The Mystery of ‘Black Triangle’ UFOs”, Greg Daugherty & Missy Sullivan, History.com, July 22, 2020.
TR-3B
$24.95 – $30.95
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