Clue: Project Blue Book subject

We have 1 answer for the crossword clue Project Blue Book subject.

Possible Answers:

• UFO

Related Clues:

• Mystery craft
• Sci-fi staple
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• Strange sighting in the night sky
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• Extraterrestrial enigma
• Many an Enquirer subject
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• ET's transport, maybe
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• ... and 51 more.

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