| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1992 | 978-0-9620782-0-0 | Daniel Mathews | Cascade-Olympic Natural History: A Trailside Reference |
| 1999 | 978-0-9620782-1-7 | Daniel Mathews | Cascade-Olympic Natural History |
| 2003 | 978-0-9620782-2-4 | '' | Rocky Mountain Natural History: Grand Teton to Jasper |