HarperCollins · National Geographic Children's Books
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Human Footprint: Everything You Will Eat, Use, Wear, Buy, and Throw Out in Your Lifetime | 978-1-4263-0767-6 (1-4263-0767-5) | 2011 |
| My Plane Book | 978-0-06-089941-7 (0-06-089941-7) | 2006 |
| My Train Book | 978-0-06-089970-7 (0-06-089970-0) | 2007 |