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 #108 -- air soar Green River, Mah -- 10 February 1948 It seems entirely probable that the object observed in this incident and in /103 was the larger meteorite seen at an earlier part of its trajectory. The direction of flight is stated as "southeast of Liron, Colorado." If this means that the object was heading southeast from Liron, it would not have been the orastur fireball, since the direction of flight of that object was northwest; but if the statement merely means that the object was seen in the vicinity southeast of Liron, the location is consistent with the trajectory of that famous meteorite. The time stated is approximate, and need not be given too much concern. Actually, of course, the sightings here would have had to be made almost simultaneously with those in Kansas. If the time had been reported as 1000 LS? instead of 1500 in typographical error, by any possibility?), then, allowing for the difference of one hour in time zones, the sightings would have been appropriately simultaneous. In any event, whether this was the case or another ob- ject is not important. The description gives — particularly the statement "hope, multicolored ball of fire and dense cloud of smoke" — answers closely to that of a fireball.
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.