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"United States Air Force Efforts to Investigate UFOs: Great Plains Encounters" https://www.sdshspress.com/journal/south-dakota-history-12-1/united-states-air-force-efforts-to-investigate-ufos-great-plains-encounters https://www.sdshspress.com/@@site-logo/sdshp-logo.jpg

"United States Air Force Efforts to Investigate UFOs: Great Plains Encounters"

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