Andrew Coddington & Dave Kelly 
Aliens, UFOs, and Unexplained Encounters [PDF ebook] 

Aliens, UFOs, paranormal abductions, these are all events that have captivated and entertained people for millennia. In recent times, people have turned to science to explain the unexplainable, but does that answer everything? This book examines the history of well-known, unexplained encounters while exploring the science behind fascinating alien events. Full of photographs, eyewitness accounts, hoaxes, and scientific evidence, this book allows readers to engage the age-old question: Are we alone in the universe?