This local source record summarizes "Project Blue Book final case report: Minot AFB, 24 October 1968", published or preserved by U.S. Air Force record / Minot B-52 UFO Research mirror.
The final case report records witness and radar claims and the explanations considered by Project Blue Book after the 24 October 1968 event.
The PDF is hosted by a specialist research site rather than an Air Force server; it preserves investigators' conclusions but does not independently prove them.