L.D. · R.D. · R. L · Robert Luther Duffus
University of New Mexico Press · W. W. Norton & Company
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Jason Potter's space walk;: A novel | 978-0-393-08607-2 (0-393-08607-0) | 1970 |
| The polar route to time gone by | 978-0-393-06372-1 (0-393-06372-0) | 1969 |
| The Santa Fe Trail | 978-0-8263-0235-9 (0-8263-0235-1) | 1972 |