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Hynek, J. Allen

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The Edge of Reality: Two Scientists Evaluate What We Know of the Ufo Phenomenon - Library Edition
The UFO Experience: A Scientific Inquiry (Collector's Library of the Unknown)
The Ufo Experience: Evidence Behind Close Encounters, Project Blue Book, and the Search for Answers
The Ufo Experience: Evidence Behind Close Encounters, Project Blue Book, and the Search for Answers, Library Edition
The Edge of Reality: Two Scientists Evaluate What We Know of the Ufo Phenomenon