Project 10073 Record Card and Air Intelligence Information Report — Duluth, Minnesota, 21 October 1952

This document contains the official Air Intelligence Information Report and supporting documentation regarding a UFO sighting in Duluth, Minnesota, on 21 October 1952. The incident involved a cubic or diamond-shaped object, approximately 5 by 5 by 9 feet in size, which was observed by multiple witnesses, including a county commissioner and several children. Witnesses described the object as light tan or beige, with a hard, shiny, plastic-like surface. It was reported to move slowly near the ground, oscillating vertically, before gaining speed and altitude. One witness reported that children threw stones at the object, which reportedly bounced off. The object was observed for a few minutes before disappearing over a hill. The report includes detailed statements from witnesses, diagrams of the object's shape and flight path, and meteorological data. The official conclusion reached by the investigators was that the descriptions provided were consistent with either an RA-type balloon or a Skyhook-type balloon. The document includes various administrative endorsements from the 73rd Air Base Squadron and the 31st Air Division, confirming the report was processed in accordance with Air Force Regulation 200-5.