Mysteries of History: Mystery of the Roanoke Colonists
Mysteries of History: Mystery of the Mary Celeste
Mysteries of History: Mystery of Atlantis
Mysteries of History: Mystery of the Sphinx
Special Reports: Vaccination Debate
Special Reports: Ebola Outbreak
Deadliest Diseases of All Time: Ebola
The Central Intelligence Agency: An Encyclopedia of Covert Ops, Intelligence Gathering, and Spies
9/11 and the War on Terror: A Documentary and Reference Guide
Investigating Witches and Witchcraft
Secret Societies and Clubs in American History
Investigating Atlantis and Other Lost Cities
Investigating the Abominable Snowman and Other Legendary Beasts
Investigating Ghosts and the Spirit World
Disasters and Tragic Events: An Encyclopedia of Catastrophes in American History