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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.
Analysis of Photographic Material -11- Serial 01 No plate (or rather frame) distortion correction formula has been applied to the UFO's coordinates as measured directly from the film. It is assumed that since the objects are near the center of the frame for most of the shots, any error due to distortion or emulsion shrinkage etc. would be much less than the standard deviation of $ + 5 $ and therefore would not effect the over-all accuracy of the results.
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.