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- In the Ice Age, by J.C. Greenburg ; illustrated by Jan Gerardi
- On earth, by J.C. Greenburg ; illustrated by Jan Gerardi
- In time, by J.C. Greenburg ; illustrated by Jan Gerardi
- In the jungle, by J.C. Greenburg ; illustrated by Jan Gerardi
- The Sloths get a pet, by Maribeth Boelts ; illustrated by Jan Gerardi
- I am Max, by Astrid Holm ; illustrated by Jan Gerardi
- Where are Swimmy's friends?, a lift-the-flap book, illustrated by Leo Lionni and Jan Gerardi
- Frederick, a lift the flap book, illustrated by Leo Lionni and Jan Gerardi
- In time, by J.C. Greenburg ; illustrated by Jan Gerardi
- In the garbage, by J.C. Greenburg ; illustrated by Jan Gerardi
- I am Cindy-Lou Who, by Tish Rabe ; illustrated by Jan Gerardi
- With the dinosaurs, by J.C. Greenburg ; illustrated by Jan Gerardi
- In Uncle Al, by J.C. Greenburg ; illustrated by Jan Gerardi
- Blast from the north, by David Zeltser ; illustrations by Jan Gerardi
- Look for the Lorax, by Tish Rabe ; illustrated by Christopher Moroney and Jan Gerardi
- The Grinch's great big flap book, adapted by Tish Rabe; illustrated by Aristides Ruiz and Jan Gerardi
- How to help the Earth - by the Lorax, with Tish Rabe ; illustrated by Christopher Moroney and Jan Gerardi
- On the reef, by J.C. Greenburg ; illustrated by Jan Gerardi
- With the frogs, by J.C. Greenburg ; illustrated by Jan Gerardi
- A little book about opposites, illustrated by Leo Lionni and Jan Gerardi
- A little book about winter, illustrated by Leo Lionni and Jan Gerardi
- In the desert, by J.C. Greenburg ; illustrated by Jan Gerardi
- Hop, hop, hop!, by Ann Whitford Paul ; illustrated by Jan Gerardi
- A little book about colors, illustrated by Leo Lionni and Jan Gerardi
- Lug, dawn of the Ice Age, by David Zeltser ; illustrations by Jan Gerardi
- Dr. Seuss's 100 first words, Las primeras 100 palabras de Dr. Seuss, Dr. Seuss ; illustrated by Jan Gerardi, translated by Yanitzia Canetti
- A little book about 123s, illustrated by Leo Lionni and Jan Gerardi
- With the bats, by J.C. Greenburg ; illustrated by Jan Gerardi
- In the deep, by J.C. Greenburg ; illustrated by Jan Gerardi
- Dr. Seuss's 100 First Words, Dr. Seuss ; illustrated by Jan Gerardi
- Mouse seasons, Leo Lionni [and Jan Gerardi]
- On earth, by J.C. Greenburg ; illustrated by Jan Gerardi
- In the Ice Age, by J.C. Greenburg ; illustrated by Jan Gerardi
- In the jungle, by J.C. Greenburg ; illustrated by Jan Gerardi
- In time, by J.C. Greenburg ; illustrated by Jan Gerardi
- The Sloths get a pet, by Maribeth Boelts ; illustrated by Jan Gerardi
- I am Max, by Astrid Holm ; illustrated by Jan Gerardi
- Frederick, a lift the flap book, illustrated by Leo Lionni and Jan Gerardi
- In time, by J.C. Greenburg ; illustrated by Jan Gerardi
- In the garbage, by J.C. Greenburg ; illustrated by Jan Gerardi
- I am Cindy-Lou Who, by Tish Rabe ; illustrated by Jan Gerardi
- With the dinosaurs, by J.C. Greenburg ; illustrated by Jan Gerardi
- In Uncle Al, by J.C. Greenburg ; illustrated by Jan Gerardi
- Where are Swimmy's friends?, a lift-the-flap book, illustrated by Leo Lionni and Jan Gerardi
- The Grinch's great big flap book, adapted by Tish Rabe; illustrated by Aristides Ruiz and Jan Gerardi
- Blast from the north, by David Zeltser ; illustrations by Jan Gerardi
- Look for the Lorax, by Tish Rabe ; illustrated by Christopher Moroney and Jan Gerardi
- How to help the Earth - by the Lorax, with Tish Rabe ; illustrated by Christopher Moroney and Jan Gerardi
- On the reef, by J.C. Greenburg ; illustrated by Jan Gerardi
- With the frogs, by J.C. Greenburg ; illustrated by Jan Gerardi
- A little book about opposites, illustrated by Leo Lionni and Jan Gerardi
- With the bats, by J.C. Greenburg ; illustrated by Jan Gerardi
- In the desert, by J.C. Greenburg ; illustrated by Jan Gerardi
- Hop, hop, hop!, by Ann Whitford Paul ; illustrated by Jan Gerardi
- A little book about colors, illustrated by Leo Lionni and Jan Gerardi
- Lug, dawn of the Ice Age, by David Zeltser ; illustrations by Jan Gerardi
- Dr. Seuss's 100 first words, Las primeras 100 palabras de Dr. Seuss, Dr. Seuss ; illustrated by Jan Gerardi, translated by Yanitzia Canetti
- A little book about 123s, illustrated by Leo Lionni and Jan Gerardi
- A little book about winter, illustrated by Leo Lionni and Jan Gerardi
- In the deep, by J.C. Greenburg ; illustrated by Jan Gerardi
- Dr. Seuss's 100 First Words, Dr. Seuss ; illustrated by Jan Gerardi
- Inch by inch, a lift-the-flap book, illustrated by Leo Lionni and Jan Gerardi
- Mouse seasons, Leo Lionni [and Jan Gerardi]