Philip Coppens

The Lost Civilization Enigma

De Paus van Satan

The Cryptogram of Rennes-le-Chateau

Land of the Gods

Killing Kennedy

The Stone Puzzle of Rosslyn Chapel

Ancient Alien Question, 10th Anniversary Edition : An Inquiry Into the Existence, Evidence, and Influence of Ancient Visitors

The Ancient Alien Question : A New Inquiry Into the Existence, Evidence, and Influence of Ancient Visitors

The Lost Civilization Enigma : A New Inquiry into the Existence of Ancient Cities, Cultures, and Peoples Who Pre-Date Recorded History

Ancient Alien Conspiracy: UFOs and the Dawn of Civilization

Alien Crash at Roswell: The UFO Truth Lost in Time

The Ancient Alien Question: From UFOs to Extraterrestrial Visitations (Unabridged)