| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Rocky Mountains: A Young Reader's Journal | 978-0-943972-18-3 (0-943972-18-3) | 1994 |
| Wilderness Habitat: The Great Plains | 978-0-943972-10-7 (0-943972-10-8) | 1987 |
R. B · R. Bullock · Robert B. · Robert H.Bullock Jr. · Robert M. Bullock III