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Paul R. Hill (1909-1990) was an American aerodynamicist. He was a leading research and development engineer and manager for NASA and its predecessor, NACA (the National Advisory Council for Aeronautics) between 1939 and 1970.
"Paul Hill has done a masterful job ferreting out the basic science and technology behind the elusive UFO characteristics and demonstrating they are just advanced and exotic extensions of our own technologies. Perhaps this book will help bring solid consideration for making all that is known about extraterrestrial craft publicly available." --Edgar Mitchell, Sc.D., Apollo 14 Astronaut--Reviews