"Scientific Study of Unidentified Flying Objects," Dr. Edward Condon, Director; E. Gilmour, Editor under contract F44620-67-C-0035 from the Air Force Office of Scientific Research. (Jan. 8, 1969) Dr. Condon stated his opinion that "nothing has come from the study of UFOs in the past 21 years that has added to scientific knowledge. ....(we) conclude that further extensive study of UFOs probably cannot be justified in the expectation that science will be advanced thereby." However, the study left unexplained approximately 1/3 of the sightings it investigated.