Deadliest Diseases of All Time: Ebola
Mysteries of History: Mystery of Area 51
Mysteries of History: Mystery of the Nazca Lines
Mysteries of History: Mystery of the Roanoke Colonists
Special Reports: Ebola Outbreak
Mysteries of History: Mystery of the Sphinx
Mysteries of History: Mystery of Atlantis
Climate Change: Examining the Facts
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 Atlantis and Other Lost Cities
Investigating Witches and Witchcraft
Investigating the Abominable Snowman and Other Legendary Beasts
Secret Societies and Clubs in American History
Investigating Ghosts and the Spirit World
Disasters and Tragic Events: An Encyclopedia of Catastrophes in American History