UFO Timeline

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This incident is Case 23 in Isaac Koi's "Top 100" article, since it was referred to in 76 of the books covered by that article.
This incident has featured in a list of twenty UFO cases produced by Bruce Maccabee in 1999 in response to a challenge to produce “the best evidence for an extraterrestrial origin for the UFO phenomenon”.
On 1 December 1987, there was an alleged encounter on Ilkley Moor in

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