112 books • 28 series
Sea Cucumbers (Super Sea Creatures)
Boa Constrictors (Slithering Snakes)
Serpientes de Cascabel (Slithering Snakes)
Stingrays (Super Sea Creatures)
Octopuses (Super Sea Creatures)
Passport to Nature Pack A of 8 (Passport to Nature)
Wind (Natural Resources)
Paying College Athletes (Debating the Issues)
Animal Testing (Debating the Issues)
Pros and Cons of Animal Testing (Open for Debate)
Is It a Frog or a Toad? (Can You Tell the Difference?)
Is It a Dolphin or a Porpoise? (Can You Tell the Difference?)
Is It an Alligator or a Crocodile? (Can You Tell the Difference?)
Is It a Turtle or a Tortoise? (Can You Tell the Difference?)
Ninja (History's Warriors)
Pirates (History's Warriors)
Vikings (History's Warriors)
Samurai (History's Warriors)
Gladiators (History's Warriors)
Knights (History's Warriors)
Is It a Cheetah or a Leopard? (Can You Tell the Difference?)
Is It a Bee or a Wasp? (Can You Tell the Difference?)
Amazing Canyons Around the World (Passport to Nature)
Passport to Nature (Passport to Nature)