83 books • 14 series
Book #1: Disasters at Sea
Book #2: Earthquakes
Book #3: Environmental Disasters
Book #4: Tornadoes
Book #5: Tsunamis
Book #1: Olduvai Countdown
Book #1: Dinosaurs
Book #2: Space
Book #1: The History of Communication
Book #5: The History of Medicine
Book #2: Seven Wonders of Ancient Africa
Book #3: Seven Wonders of Ancient Asia
Book #6: Seven Wonders of Ancient Central and South America
Book #8: Seven Wonders of Ancient Greece
Book #10: Seven Wonders of Ancient Middle East