About.com: Letterboxing and Geocaching Attract Walkers
   Article describing the basics and the factors that motivate people to start letterboxing.
   http://walking.about.com/library/weekly/aa073001a.htm

Another Guide To Letterboxing On Dartmoor
   Introductory information on this activity, as practised in the region of its origin, in the UK.
   http://freespace.virgin.net/g.sargent/letter.htm

Atlas Quest: International Letterboxing
   Atlas Quest contains letterbox clues from around the world with support for over 200 countries and territories. You'll also find letterboxing tutorials, learn about other letterboxers, and much more!
   http://www.atlasquest.com/

Dartmoor Letterboxes
   Introduction, tips and things to avoid, news, survey, and letterbox clues for the Dartmoor area.
   http://www.plympton.info/dartmoor/

Dartmoor Letterboxing
   Brief introduction and history of letterboxing in Dartmoor, along with some examples of stamps.
   http://www.stevem.eurobell.co.uk/Boxing.html

History of Dartmoor Letterboxing
   A history detailing how letterboxing got it's start in England. Reprinted from "More Dartmoor Letterboxes" by Anne Swinscow.
   http://dartmoorhistory.blogspot.com/

Hitchhiker List
   Hitchhikers are a form of traveling letterbox. Site includes lists of hitchhikers and last reported letterbox location.
   http://alum.wpi.edu/~p_miner/travelers

I-95 Letterboxes
   Clues to quick and easy letterboxes to find while traveling on Route I-95, from Maine to Florida.
   http://i95boxing.blogspot.com/

Letterboxers' First Finds
   List for Letterboxer's first find organized by state (in USA).
   http://firstfinds.blogspot.com/

Letterboxing Central
   Introductory information, message board, resources, links to clues, and tips for letterboxing with dogs.
   http://www.letterboxingcentral.com/

Letterboxing Family Fun
   Brief article includes details on supplies and features instructions for participation with children.
   http://raisingboys.allinfoabout.com/features/0309letterbox.html

Letterboxing Germany
   Letterboxing Germany and Continental Europe
   http://www.letterboxing-germany.de/index.htm

Letterboxing Makes Hiking an Adventure
   Fox News feature story about letterboxing.
   http://www.foxnews.com/story/0,2933,55367,00.html

Letterboxing North America Webring
   Collection of resource and clue sites.
   http://www.webring.com/hub?ring=letterboxingnort

Letterboxing a hobby of inky fingers and hidden treasures
   Newspaper article on local letterboxing near Washington DC.
   http://www.gazette.net/200328/damascus/news/167006-1.html

Letterboxing is back in -- and hiding -- around New England
   Boston.com article on letterboxing in New England.
   http://www.boston.com/travel/newengland/articles/2003/12/28/letterboxing_is_back_in____and_hiding____around_new_england/

Letterboxing on Connecticut's State Forests
   Overview of letterboxing on Connecticut's State Forests.
   http://dep.state.ct.us/burnatr/forestry/centen/letterbox.htm

Letterboxing on Dartmoor
   Provides a description of this outdoor activity, its history, a forum, and contact information.
   http://www.dartmoorletterboxing.org

Letterboxing: Have Feet Will Travel
   Introduction, contact details, and guidelines for letterboxing in the Dartmoor area.
   http://easyweb.easynet.co.uk/~have.feet/boxing/boxing.html

NPR : Letterboxing
   Hear NPR's Linda Wertheimer and Thomas Johnston, an enthusiast in Washington, D.C. find a letterbox near the White House.
   http://www.npr.org/templates/story/story.php?storyId=1832303

New England Area Letterboxing Gatherings
   Mark & Sue's blog of letterboxing events in New England.
   http://gatherings.blogspot.com/

Perfect Circle Letterboxing Guild
   The Perfect Circle Letterboxing Guild is a private group of old friends and family members who enjoy the hobby of letterboxing. The site includes clues to letterboxes in New Jersey and Pennsylvania.
   http://www.pcdx.com/pclg/index.htm

They Live and Breathe Letterboxing
   Abstract of an article by Chris Granstrom, originally published in the April 1998 issue of Smithsonian Magazine.
   http://www.smithsonianmag.si.edu/smithsonian/issues98/apr98/letterboxing.html

Thinking Inside the Box
   Washington Post article by Caroline Kettlewell which describes her discovery of the activity.
   http://www.washingtonpost.com/ac2/wp-dyn?pagename=article&node=&contentId=A55308-2002Jul11

Yahoo! Groups : LbNE
   Discussion group for letterboxers in the Northeast.
   http://groups.yahoo.com/group/LbNE/

Yahoo! Groups : Letterboxing North America
   Discussion group intended for the sharing of ideas, stories, tips, news, advice, and clues related to the hobby of Letterboxing.
   http://groups.yahoo.com/group/letterbox-usa/

Yahoo! Groups : letterbox_travellers
   This list is a special interest sub-group from letterboxing-usa, created for posting the travels of hitchhiker letterboxes.
   http://groups.yahoo.com/group/letterbox_travellers/

Yahoo! Groups : newboxers
   Talklist for new letterboxers. NO question is a dumb question here.
   http://groups.yahoo.com/group/newboxers/