Dimensions: A Casebook of Alien Contact (Unabridged)
2026
Operation Trojan Horse: The Classic Breakthrough Study of UFOs (Unabridged)
2018
Our Haunted Planet (Unabridged)
2015
Confrontations: A Scientist's Search for Alien Contact (Alien Contact Trilogy, Book 2) (Unabridged)
2026
The Eighth Tower: On Ultraterrestrials and the Superspectrum (Unabridged)
2019
Revelations: Alien Contact Trilogy, Book 3 (Unabridged)
2026