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"The reported perception of an object or light seen in the sky or upon the land the appearance, trajectory, and general dynamic and luminescent behavior of which do not suggest a logical, conventional explanation and which is not only mystifying to the original percipients but remains unidentified after close scrutiny of all available evidence by persons who are technically capable of making a common sense identification, if one is possible."
The UFO Experience: A Scientific Inquiry by J. Allen Hynek, Henry Regnery, Chicago, 1972, p. 10.
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