Project Blue Book 4
Reports 1-12 were monthly classified status reports of the Air Force’s investigations and findings related to UFO sightings, which were declassified in 1967. (U.S. Air Force Projects Grudge and Bluebook Reports 1-12; Published by NICAP 1968; Preface)

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Photo by: U.S. Air Force & NICAP |  VIRIN: 200806-F-IN811-004.JPG