| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| 50 Hikes in Ohio: Day Hikes and Backpacks Throughout the Buckeye State | 978-0-88150-401-9 (0-88150-401-7) | 1997 |
| 50 More Hikes in Ohio | 978-0-88150-447-7 (0-88150-447-5) | 2002 |
| Explorer's Guide 50 Hikes in Ohio: Day Hikes & Backpacking Trips in the Buckeye State | 978-0-88150-729-4 (0-88150-729-6) | 2007 |
R.R. · Ralf Ruhnau · Ralph Rumney · Ralph Ryan · Rolf Rame · Rolf Ramme · Rolf Raum · Rolf Rehm