| About Letterboxing: A short history of letterboxing in Dartmoor and North America. |
| Dutch Letterbox Site: Provides information on getting started, codes of conduct, prehistoric Dartmoor and the 100 club. |
| Have Feet Will Travel: An introduction and guidelines to finding letterboxes on Dartmoor. Includes details of National Park by-laws and contact details for checking military activity. |
| Letterboxing Info Sheet: An explanation of the hobby for printing out and including in your own letterboxes. |
| Letterboxing Kids: Includes a map-reading game, photo album, story and instructions for making rubber stamps. |
| Letterboxing North America: Includes a FAQ, links, glossary, and clues for letterboxes all over the United States. |
| Silent Doug's Letterboxing Site: Articles including getting started, outdoor ethics, a glossary, and an explanation of cryptic letterboxer codes. Also includes a list of boxes found and clues for boxes placed. Most clues are for boxes in the northeastern region of the United States. |
Classical
