Relentless Forward Progress: A Guide to Running Ultramarathons
| Country | USA |
| Brand | Tundra Books |
| Manufacturer | Tundra Books |
| Binding | Hardcover |
| ItemPartNumber | 1101919019-localization |
| Color | Multicolor |
| ReleaseDate | 2017-09-05 |
| UnitCount | 1 |
| Format | Picture Book |
| EANs | 9781101919019 |