36 UNSOLVED MYSTERIES OF THE WORLD 36 UNSOLVED MYSTERIES OF THE WORLD
2011
Endangered Animals of the World Endangered Animals of the World
2010
Mind Benders Brain Teasers & Puzzle Conundrums Mind Benders Brain Teasers & Puzzle Conundrums
2012
World Famous Treasures Lost and Found World Famous Treasures Lost and Found
2012
136 Incredible Coincidences 136 Incredible Coincidences
2006
World Famous Spies and Spymasters World Famous Spies and Spymasters
2011