- I 4 elementi
- I Am A Tree, This Is My Story
- I am Albert Einstein
- I Am Bald Eagle
- I am Caring
- I am Curious
- I am Jane Goodall
- I am Marie Curie
- I Am Mary Anning
- I am Neil Armstrong
- I Am Neutrino
- I Am the Elwha
- I Am the Rain
- I Am the Shark
- I Begin with Spring: The Life and Seasons of Henry David Thoreau
- I Can Name 50 Trees Today! All About Trees
- I fratelli Lumiére e la straordinaria invenzione del cinema
- I Get the Hiccups
- I Have a Bellybutton
- I is for Iguana
- I Live in Alaska
- I Live in Colorado
- I Live in Massachusetts
- I Live in Michigan
- I Love Beasts!
- I Love Bugs!
- I Love Cats!
- I Love My Dinosaur
- I Love Sugar
- I Love You, Daddy
- I Love You, Mummy
- I Love You, ZooBorns!
- I Need Glasses
- I saw a Killdeer
- I See Falling Stars
- I See Rainbows
- I Want A Bearded Dragon
- I Want a Bunny!
- I Want A Leopard Gecko
- I Want A Leopard Gecko
- I Want Snow!
- I'm a Reindeer
- I'm a Virus!
- I'm Trying to Love Garbage
- I'm Trying to Love Rocks
- I'm Trying to Love Spiders
- I, Galileo
- I, Humanity
- Ice is Nice! All About the North and South Poles
- Icebergs & Glaciers
- Ich bin der kleine Regentropfen
- Icky, Sticky Slime!
- If a Mummy Could Talk . . .
- If Animals Built Your House
- If animals could talk. The world of animals voices: What is my cry?
- If Bees Disappeared
- If Elephants Disappeared
- If I Ran the Dog Show: All About Dogs
- If I Ran the Horse Show: All About Horses
- If Polar Bears Disappeared
- If Sharks Disappeared
- If You Are a Kaka, You Eat Doo Doo: And Other Poop Tales from Nature (Tilbury House Nature Book)
- If You Hopped Like A Frog
- If You Spent a Day with Thoreau at Walden Pond
- If You Were an Elephant
- Igualitierra
- Iluminar la noche
- Im Walde wohnt der schwarze Storch
- Imaginer le monde de demain
- Imitar la naturaleza
- Immigration
- In de ruimte is het stil
- In My Backyard
- In Padure
- In Riva al Mare
- In the Beginning
- In the Dark
- In the Forest
- In the Garden
- In the Rainforest
- In the Steps of The Great American Entomologist, Frank Eugene Lutz
- In the Steps of The Great American Herpetologist, Karl Patterson Schmidt
- In the Steps of The Great American Zoologist, William Temple Hornaday
- Incredible Invertebrates
- Incredible Snakes: Exploring Our Incredible World Series
- Increíble pero real: Criaturas diminutas
- Innovators
- Inside the Water Cycle
- Inside the World of Matter
- Inside Your Outside! All About the Human Body
- Interactive Addition
- Interactive Division
- Interactive Multiplication Table
- Interactive Subtraction Table
- Interdependence of Living Things
- Into the Woods
- Introduction to Biology for Babies and Toddlers
- Inuit, Tundra and Ravens
- Inventaire illustré des fleurs
- Inventaire illustré des fruits et légumes
- Inventaire illustré des merveilles du monde
- Inventant el futur
- Invention of Electricity
- Invention of Phones
- Invention of Robotics
- Inventors
- Investigating Electromagnetism
- Investigating Plate Tectonics
- Investigating Simple Organisms
- Investigating the Chemistry of Atoms
- Investigating the Human Body
- Investiguemos las fuerzas y el movimiento
- Investiguemos los accidentes geográficos
- Is it hard or soft?
- Is it natural or human-made?