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“This file contains an initial report from the Air Materiel Command regarding Project Sign. Project Sign was a 1948-1949 U.S. Air Force program to investigate the nature and origin of unidentified flying objects (UFO). The report details 100 UFO sightings from 1947-1948. The file also contains an article excerpted from “The Aeroplane,” an aviation-focused periodical magazine published between 1911 and 1968, titled “The Biology of the Flying Saucer.”
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Source
u/The-Zesty-Man on r/UFOs
Citations
https://www.reddit.com/r/UFOs/comments/1ussevj/couldnt_find_any_more_…
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