(Project Blue Book, U.S. Air Force, Washington, D.C.)
Source: Fold3.com, Lindon, Utah
The whole document text:
“There is no astronomical explanation for this incident, which, however, deserves considerable attention, because of the experience of the observers and the fact that the observation was made through a theodolite and that comparison could be made with a pibal balloon. The observers had, therefore, a good estimate of altitude, of relative size, and of speed – much more reliable than those given in most reports.
This investigator would like to recommend that these and other pibal observers be quizzed as to other possible, unreported sightings.”
The UFO incident (occurred on 1 April 1947) was observed by U.S. Weather Bureau station personnel.
Personnel at the station in Richmond observed three UFO incidents in the spring of 1947.
This is the first U.S. UFO case mentioned in the seminal book, UFOs and Government: A Historical Inquiry. The book presents a longer and more in-depth Blue Book report on the case.
Satellite photo of Richmond, Virginia (tageo.com)