-
Unexplained! : 347 strange sightings, incredible occurrences, and puzzling physical phenomena
-
A history of the unexplained
-
Crop circles
-
What do we know about crop circles?
-
Catching cryptids : the scientific search for mysterious creatures
-
Extreme alien stories
-
The book of mysteries, magic and the unexplained
-
What do we know about the Yeti?
-
The unexplained : mysteries, cryptids, ghosts, and UFOs
-
Is it real? The Loch Ness monster
-
The big book of mysteries
-
Strange stories, amazing facts : stories that are bizarre, unusual, odd, astonishing, and often incredible
-
Great mysteries of the past : experts unravel fact and fallacy behind the headlines of history
-
UFOs and ufology : the first 50 years
-
Fire in the sky : the Walton experience
-
Investigating UFOs and aliens : investigating extraterrestrial visitors
-
UFOs
-
Area 51 [LP] : an uncensored history of America's top secret military base
-
Aliens
-
The alien hunter's guide
-
UFOs : generals, pilots, and government officials go on the record
-
Area 51 : an uncensored history of America's top secret military base
-
UFO's
-
Area 51 an uncensored history of America's top secret military base
