Roswell: The Ultimate Cold Case; Eyewitness Testimony and Evidence of Contact and the Cover-Up Donald R. Schmitt4.1
Ancient Alien Question, 10th Anniversary Edition: An Inquiry Into the Existence, Evidence, and Influence of Ancient Visitors Philip Coppens3.8
Shards of Earth: First in an extraordinary trilogy, from the winner of the Arthur C. Clarke Award Adrian Tchaikovsky4.2