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.
Incident 9136 - Heaver, South Dakota - Lennon 16-30 August 1947 For the description of this instance as given, there is no astronomical explanation. The statements of an apparently well-trained observer can scarcely be doubted, but no interpretation, either astronomical or otherwise, other than possible caused auroral streamers, suggests itself. The moon at the time was new and the night apparently very dark, the most favorable conditions for the observation of auroral phenomena.
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.