K.R. · K. Zimmermann · Karl Zimmermann · R. Zimmermann
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Santa Fe Streamliners: The Chiefs and their Tribesmen | 978-0-915276-41-7 (0-915276-41-0) | 1987 |
| The remarkable GG1 | 978-0-915276-16-5 (0-915276-16-X) | 1977 |