108 books • 33 series
Water Energy (Earth's Energy Resources)
Oil Energy (Earth's Energy Resources)
Coal Energy (Earth's Energy Resources)
Earth's Energy Resources (Set) (Earth's Energy Resources)
Biofuel Energy (Earth's Energy Resources)
Geothermal Energy (Earth's Energy Resources)
Natural Gas Energy (Earth's Energy Resources)
Robotify It! Robots You Can Make Yourself (Cool Makerspace Gadgets & Gizmos)
Cool Makerspace Gadgets & Gizmos (Set) (Cool Makerspace Gadgets & Gizmos)
Connect It! Circuits You Can Squish, Bend, and Twist (Cool Makerspace Gadgets & Gizmos)
Volcanoes (Our Extreme Earth)
Exploring Fossils: Paleontologists at Work! (Earth Detectives)
Spies! Smart and Secretive Schemers (History's Hotshots)
Pet Rescue (Animal Rights)
Exploring Earthquakes: Seismologists at Work! (Earth Detectives)
Vikings! Fierce and Fearless Conquerors (History's Hotshots)
Pirates! Bold and Brutal Rebels (History's Hotshots)
Exploring Volcanoes: Volcanologists at Work! (Earth Detectives)
Exploring the Rock Cycle: Petrologists at Work! (Earth Detectives)
Samurai! Strong and Steady Warriors (History's Hotshots)
Exploring Weather: Meteorologists at Work! (Earth Detectives)
Exploring Minerals: Mineralogists at Work! (Earth Detectives)
Levi Strauss: Blue Jean Genius (First in Fashion)
Drones (Modern Engineering Marvels)