Golden West Books · Hundman Publishing
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Northern Pacific Classic Steam Era | 978-0-945434-27-6 (0-945434-27-8) | 1997 | Lorenz P. Schrenk |
| Northern Pacific Railway: Diesel Era, 1945-1970 | 978-0-87095-102-2 (0-87095-102-5) | 1995 | " |
| Northern Pacific Railway: Supersteam Era, 1925-1945 | 978-0-87095-092-6 (0-87095-092-4) | 1985 | " |
R. F. · R. Frey · R. L · Robert F. · Robert Frey · Robert L.