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.
“Hamilton”4 pages
Read from the scan by GLM-OCR; expect the odd misread word.
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FILE REF: - SIGGE-M-1
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From:
March 14,1948
To:
Purpose:
Subject:
Norman G. Markham
MAIN HOTEL, Pueblo, Colo
Chief Signal Officer U. S. Army, Washington, D.C.
Norcatur, Kans., sky explosion of 18 February, 1948
To show a speculation regarding the above phenomenon and another one of earlier date and to call attention to occurrences between the two which have an appearance of relationship whether coincidental or not.
The geographical position of the Norcatur explosion suggests possible linkage with other occurrences happening inside latitudinal limits arbitrarily demarkable between 43 $ ^{\circ} $ 36 $ ^{\circ} $ North (which is the latitude of Boise, Idaho) and 36 $ ^{\circ} $ 10 $ ^{\circ} $ North (the latitude of Nashville, Tenn.), a belt about 485 miles wide.
This suggestion is gained from positions given for occurrences happening between June 24, 1947 and February 18, 1948, as shall be hereinafter briefly described.
THE BOISE (Idaho) OBJECT-This was seen either beginning or ending at 330 pm 24 June 1947 and was visible for 20 minutes. It was in the western sky, was of comet-like appearance, and settled gradually toward the horizon as planetary bodies set. It was seen by Lt. Gov. Whitehead and Chief Justice Lampert. Its nature was unknown.
The peculiarity which connects this object, for speculative purposes, with the explosion of some unknown object over Norcatur, Kans., on 18 February 1948 is the seeming of a relationship between the positions of the moon for the two phenomena:
In the former case the moon was at the date of phenomenon, about 7%, 63 before the positionof First Quarter; on the second case it was about 8%.73 beyond the position of first quarter.
Since the Boise object was visible for 20 minutes before it sank this argues it was about ten degrees above the horizon when first seen. Now if a line be drawn westward and at ten degrees zenithward from the 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.