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
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# CONFIDENTIAL forth in the group formation which gave the overall impression of a shotgun blast pattern. The objects were thought to be moving in excess of 500 MPH at approximately 5,000 ft (immediately below the clouds) from WNW to ESE and were definitely flying a straight course. Just before they were sighted a loud roaring sound was heard which was attributed to a strong wind blowing through the surrounding woods. However, as the objects approached and passed, the sound sharpened into a buzz much like that made by a group of jet aircraft. No exhaust trails were visible. There were no photographs available.
Official release, from the pursue collection. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 178 pages are in the text index: search them above, or from the library's search.