Start with high-confidence ufos & extraterrestrials books, then narrow by subgenre or adjacent topics.
Twelfth Plan
Zecharia Sitchin
Imminent
Luis Elizondo, Christopher Mellon
Gods of Eden
William Bramley
Atlas of Paranormal Places
Evelyn Hollow
The Ascension Mysteries
David Wilcock
Desert Oracle
Ken Layne
Charlie Red Star
Grant Cameron
Hunt for the Skinwalker
Zac Thompson
War of the Gods
Erich von Däniken
Hidden Mysteries and the Bible
Larry Ollison, Rick Renner
Atlas of Unidentified Flying Objects
Andy McGrillen
Secrets of Antarctica
Brad Olsen
