Documents / Report
This August 1949 technical report from the US Air Force Air Materiel Command presents Project Grudge's investigation of unidentified flying objects through January 1949. Drawing on consultants including Dr. J. A. Hynek, Rand Corporation, the Air Weather Service and Dr. P. M. Fitts, it explains most of 244 incidents as balloons, aircraft, astronomical phenomena, hoaxes or psychological errors. It concludes the objects pose no direct threat to national security and recommends reducing the investigation in scope.
Inadventyr137,137a -- Shawel Hill, North Carolina -- 7 July 1948 This report refers solely to a sound phenomenon. State- nests of the witnesses indicate specifically that no object was seen. The summary sheet given here needs to correct the cosorption of this incident with that of incident t139. Fireballs and bright meteors are often known to emit sounds similar to the rolling of thunder. The information given in this report is so major, however, that, while the sound referred to could have been meteorio, no decision can be made. It seems more probable that actual aircraft were heard.
Report, from the classic collection. 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. 413 pages are in the text index: search them above, or from the library's search.