From the outset, Hynek and Vallee make their position clear: UFOs represent an unknown but real phenomenon. The far-reaching implications take us to the very ed

Two of our country's most eminent scientists, both of whom have studied the UFO phenomenon for decades, have collaborated on this report of what serious scienti

Two eminent scientists debate UFO incidents, persuasive cases, and exploration of what we still need to know about the phenomena. From the outset, Hynek and Val

The ultimate guide to Project Blue Book by one of the lead astronomers for the US Air Force program to investigate UFO sightings. Originally released in 1977, t