"Flying Saucers from Outer Space" by Donald E. Keyhoe

David Keyhoe was an American Marine Corps naval aviator. In the 1950's he became well known as a UFO researcher, he thought that the U.S. government should do a more serious research into UFO matters, and release information to the public. He is commonly thought of as the leader in the field of ufology. There is a collection of Keyhoe's videos in the collections of the Harry Ransom Center at the University of Texas at Austin.