(D-R) · Douglas R. · L. R.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Compass American Guides: Pennsylvania, 2nd Edition | 978-0-676-90141-2 (0-676-90141-7) | 2003 |
| Compass American Guides: Pennsylvania, 3rd Edition | 978-1-4000-0739-4 (1-4000-0739-9) | 2008 |