R. H. · R.R. · Robert H. · Robert R.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Backpack Loops and Long Day Trail Hikes in Southern Ohio | 978-0-940029-01-9 (0-940029-01-4) | 1984 |
| Exploring North Manitou, South Manitou, High and Garden Islands of the Lake Michigan Archipelago | 978-0-940029-02-6 (0-940029-02-2) | 1991 |
| Kentucky's Land of the Arches | 978-0-940029-00-2 (0-940029-00-6) | 1986 |