Documents / Official release
This U.S. Department of War file collects Project Sign era checklists and incident summary sheets for incidents 101 to 172. The largest item is the 18 February 1948 explosion over Norcatur, Kansas. For it the file gathers witness statements, speculative letters from Norman G. Markham, and Dr. Lincoln LaPaz's view that it was a genuine meteorite fall with curious aspects. Other entries cover B-29 crews, a two-decked wingless object over the Netherlands, a Turkish rocket report, a Moscow sighting, and George Gorman's 1 October 1948 Fargo encounter.
From the source:Release of 2026-05-08 Incident: N/A, N/A. NARA Record Group 38, catalogue id 143685. Each of these incident summaries includes a "Check-List - Unidentified Flying Objects" that contains details about the incident. Many summaries also include witness lists or statements and other narrative reports or descriptions.
“Hill”8 pages
CHECK-LIST - UNIDENTIFIED FLYING OBJECTS i. Date 11 April 1948 2. Time 2330 Incidont # 123 3. Location 4 miles north of Alton, Illinois 4. Namo of observer Col W. F. Siegmund 5. Occupation of observer Former Commandant of the Air Base at Kearns, Utah and at present sales manager for Western Cartridge, Co., Alton 6. Address of observer Weestern Cartridge,Co., Alton; Ill. 7. Place of observation 4 miles north of Alton, Ill - ground 8. Number of objects 1 9. Distance of pbject from observer N/S 10. Timo in sight N/S 11. Altitude N/S 12. Speed N/S 13. Direction of flight N/S 14. Tactics "flapped its wings" 15. Sound N/S 16. Sizo "bigger than an airplane" 17. Color N/S 18. Shapo Resembled a huge fowl and not a type of aircraft 19. Odor detected N/S 20. Apparont construction N/S 21. Exhaust trails N/S 22. Woathor conditions N/S 23. Effect on clouds N/S 24. Sketches or photographs None 25. Mannor of disappearance N/S 26. Remarks: Col Siegmund said he observed the creature at about 11:30 A.M. 11 Apr 48, while riding four miles north of Alton,111 (over)
Official release, from the pursue 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. 178 pages are in the text index: search them above, or from the library's search.