| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Hiking Trails of Lassen Volcanic National Park | 978-0-9613144-0-8 (0-9613144-0-0) | 2009 |
| Visiting Our Western National Parks | 978-0-9613144-1-5 (0-9613144-1-9) | 1987 |
G. P. · G. Perkins · George P · George Perkins · P.P. · P. Perkins