R. P. · Robert D. Proudman · Robert P.
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Appalachian Trail Design, Construction, and Maintenance | 978-0-917953-72-9 (0-917953-72-X) | 2010 | William Birchard |
| Trail Design, Construction & Maintenance | 978-0-917953-07-1 (0-917953-07-X) | 1991 | " |