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Alternative clues for the word ufos

• Topic of the USAF's Project Blue Book
• Ships that might be piloted by Martians: Abbr
• Crafts questioned by skeptics
• ETs pilot them
• Unexplained sightings, for short
• Air Force enigmas
• Project Blue Book subject
• Alleged visitors
• USAF coinage of '52
• Sightings the U.S.A.F. may investigate