N.R. · N. Roberts · Norman H. Roberts · Norman R.
CreateSpace Independent Publishing Platform · Natural History Pub Co
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Baja California Plant Field Guide | 978-0-9603144-1-6 (0-9603144-1-5) | 1989 |
| The Pearl of Africa | 978-1-5232-3280-2 (1-5232-3280-3) | 2016 |