| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Who Pooped in the Park? Rocky Mountain National Park: Scat and Tracks for Kids | 978-1-56037-320-9 (1-56037-320-2) | 2005 | Gary D. Robson |
| Who Pooped in the Park? Yosemite National Park: Scat and Tracks for Kids | 978-1-56037-318-6 (1-56037-318-0) | 2005 | " |