| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Leif Sverdrup: Engineer Soldier at His Best | 978-0-935284-12-6 (0-935284-12-5) | 1990 |
| The Oregon Trail Revisited | 978-1-880397-23-7 (1-880397-23-4) | 1997 |
| The Santa Fe Trail Revisited | 978-0-935284-74-4 (0-935284-74-5) | 1989 |