| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| AMC Field Guide to Trail Building and Maintenance, 2nd Edition | 978-O-91O146-3O-2 (O-91O146-3O-6) | 1981 | Robert D. Proudman |
R.R. · Raven Rockwell · Robin Rackley · Robin Russell · Robyn Russell