William Cooper: The Secret Government, UFOs, the alien problem and the Origin, Identity, and Purpose of MJ-12 - Probably recorded at MUFON Symposium on July 2, 1989, in Las Vegas, Nevada.
The large objects astronomers found in 1953, that came towards earth and stopped in a very high orbit around equator, may be the same large structures astrophotographer John Lenard Walson has found with his telescope (Cooper talks about this in part 3).