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Major works[edit]
Inquest on the Shroud of Turin: Latest Scientific Findings (Prometheus Books: Amherst, NY; 1983). Revised edition, 1998.
Secrets of the Supernatural: Investigating the World's Occult Mysteries (Prometheus Books: Amherst, NY; 1988, 1991; with John F. Fischer).
The Magic Detectives: Join Them in Solving Strange Mysteries (Prometheus Books: Amherst, NY; 1989).
Pen, Ink, and Evidence: A Study of Writing and Writing Materials for the Penman, Collector, and Document Detective (Oak Knoll Books: New Castle, DE; 1990, 2000, 2003).
Wonder-Workers! How They Perform the Impossible (Prometheus Books: Amherst, NY; 1991).
Unsolved History: Investigating Mysteries of the Past originally published as Ambrose Bierce is Missing and Other Historical Mysteries (University Press of Kentucky: Lexington, KY; 1992, 2005).
Missing Pieces: How to Investigate Ghosts, UFOs, Psychics, and Other Mysteries (Prometheus Books: Amherst, NY; 1992; with Robert A. Baker).
Mysterious Realms: Probing Paranormal, Historical, and Forensic Enigmas (Prometheus Books: Amherst, NY; 1992; with John F. Fischer).
Looking for a Miracle: Weeping Icons, Relics, Stigmata, Visions and Healing Cures (Prometheus Books: Amherst, NY; 1993, 1998).
Psychic Sleuths: ESP and Sensational Cases (Prometheus Books: Amherst, NY; 1994).
Camera Clues: A Handbook for Photographic Investigation (University Press of Kentucky: Lexington, KY; 1994, 2005).
Entities: Angels, Spirits, Demons, and Other Alien Beings (Prometheus Books: Amherst, NY; 1995).
Detecting Forgery: Forensic Investigation of Documents (University Press of Kentucky: Lexington, KY; 1996, 2005).
The Outer Edge: Classic Investigations of the Paranormal (CSICOP: Amherst, NY; 1996, co-edited with Barry Karr and Tom Genoni).
The UFO Invasion: The Roswell Incident, Alien Abductions, and Government Coverups (Prometheus Books: Amherst, NY; 1997; co-edited with Kendrick Frazier and Barry Karr).
Crime Science: Methods of Forensic Detection (University Press of Kentucky: Lexington, KY; 1999; with co-author John F. Fischer).
Real-Life X-Files: Investigating the Paranormal (University Press of Kentucky: Lexington, KY; 2001).
The Kentucky Mint Julep (University Press of Kentucky: Lexington, KY; 2003).
Investigating the Paranormal (Barnes & Noble Books: New York; 2004).
The Mystery Chronicles: More Real-Life X-Files(University Press of Kentucky: Lexington, KY; 2004).
Secrets of the Sideshows (University Press of Kentucky: Lexington, KY; 2005).
Cronache del Misterio (Newton Compton editori: Rome, Italy; 2006).
Lake Monster Mysteries: Investigating the World's Most Elusive Creatures, (University Press of Kentucky: Lexington, KY; 2006; with co-author Benjamin Radford).
Relics of the Christ(University Press of Kentucky: Lexington, KY; 2007).
Adventures in Paranormal Investigation (University Press of Kentucky: Lexington, KY; 2007).
Tracking The Man-Beasts: Sasquatch, Vampires, Zombies, and More (Prometheus Books: Amhurst, NY; 2011).
Real or Fake: Studies in Authentication (University Press of Kentucky: Lexington, KY; 2009).
CSI Paranormal, (Inquiry Press): Amherst, NY; 2012.
The Science of Ghosts (Prometheus Books: Amherst, NY; 2012).
The Science of Miracles: Investigating the Incredible(Prometheus Books: Amhurst, NY; 2-13).