| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Animals in Action: A Book for Young Readers | 978-0-9620255-5-6 (0-9620255-5-0) | 1995 |
| Secrets in the Grand Canyon, Zion and Bryce Canyon National Parks | 978-0-9620255-3-2 (0-9620255-3-4) | 1998 |
| Secrets in Yellowstone and Grand Teton National Parks | 978-0-9620255-2-5 (0-9620255-2-6) | 1997 |