Uanna's son noticed the similarity between this FBI document and one on p.527 of Timothy Good's book" Above Top Secret - The World Wide UFO Cover UP." Good's research was world wide. The United States, which has had the most reported UFO incidents, is the most secretive.
FBI Director J. Edgar Hoover to SAC Kansas City August 25, 1948
FBI Director to SAC Kansas City August 25, 1948 From FOI Request.