| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1997 | 978-0-9620255-2-5 | Lorraine Salem Tufts | Secrets in Yellowstone and Grand Teton National Parks |
| 1998 | 978-0-9620255-3-2 | '' | Secrets in the Grand Canyon, Zion and Bryce Canyon National Parks |
| 1995 | 978-0-9620255-5-6 | '' | Animals in Action: A Book for Young Readers |