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This Project Blue Book file, released through The Black Vault, collects US Air Force records from 1950 to 1959 on the movie film Nicholas Mariana shot at Great Falls, Montana on 15 August 1950. It includes the OSI interview report, letters about borrowing and copying the film, and a 1956 Douglas Aircraft analysis. Blue Book's own findings were not consistent: one letter lists the cause as unknown, while later memos conclude the objects were probably two F-94 jets.
“Los Angeles Times”2 pages
Figure 8 Enlarged frames taken from 16mm Daylight Kodachrome film at f/22 16 fps. * a) Bright sun reflection from a 11/4" diameter plane mirror at 180 ft (1" lens). b) The array of objects photographed. c) Reflection from a DC-6. Scale distances two miles from camera with 3" telephoto lens.
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. 114 pages are in the text index: search them above, or from the library's search.