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This USAF Project Blue Book file, distributed by NICAP, covers the radar and visual sightings at Bentwaters and Lakenheath, England, on 13 and 14 August 1956. It contains the record card, Air Intelligence Information Reports, ATIC correspondence with Dr. J. Allen Hynek, and a retired controller's later letter to the University of Colorado describing an RAF interceptor being tailed. The Air Force attributed the radar returns to anomalous propagation and meteors, and the visual sighting to Mars.
“UFO Files”2 pages
ATIC NR. 293634 AF NR. 1025624
Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 22 pages are in the text index: search them above, or from the library's search.