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Letterboxing North America 
- US-based portal offering FAQ, links, forums, and a members-only section where clues can be submitted.
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Letterboxing North America WebRing
- Links to dozens of forums and clue sites.
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About.com: Letterboxing and Geocaching Attract Walkers - Article describing the basics and the factors that motivate people to start letterboxing.
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Atlas Quest Letterboxing - Trip planning portal offers clue search by country as well as tutorials and premium members services.
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British Columbia Letterboxes - Introduction, photographs of personal stamps, and clues for boxes planted in southwest British Columbia.
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Buckaroo's Letterboxing - Clues for boxes she planted in Washington and Massachusetts.
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Chowder's Southern California Letterboxes - Search for boxes in Long Beach, San Bernardino and Lake Arrowhead, California.
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Chuck's Letterboxing - Chuck and Molly's letterboxes in Connecticut.
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Dartmoor Letterboxes - Introduction, tips and things to avoid, news, survey, and letterbox clues for the Dartmoor area.
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Dartmoor Letterboxing - Includes a forum, image gallery, map of the area, contact details, and the history of the activity.
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Dutch Letterbox Site - Clues for boxes in Dartmoor and in the Netherlands. [English and Dutch]
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First Finds - Posts first finds submitted by new US letterboxers, organized by state.
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Fish and Chips' Letterboxing Paradise - Virtual letterbox clues lead visitors on an online hunt.
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Fleur de Lis' Letterboxing Journal - Weblog about his letterboxing hobby.
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Fudrick's Letterboxing Travails - Clues to letterboxes he has placed, mostly in the Northwest US.
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Have Feet Will Travel - Introduction, contact details, and guidelines for letterboxing in the Dartmoor area.
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History of Dartmoor Letterboxing - Account first published as "More Dartmoor Letterboxes" by Anne Swinscow in 1986.
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I-95 Letterboxes - Clues to quick and easy letterboxes to find while traveling on Route I-95, from Maine to Florida.
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Kansas Letterboxes - Clues for letterboxes located in Kansas.
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Letterboxers Anonymous - Forum with clues and discussion topics. Includes helpful hints on methods and supplies.
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Letterboxing Germany - Clues for Germany and other European countries. Includes photos and tips. [English, German]
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Letterboxing Minnesota - Includes letterboxing basics and clues for Minnesota letterboxes.
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Letterboxing Questionnaire - British university student studying letterboxing for her dissertation asks visitors to answer a few questions on the activity.
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Mark and Sue Pepe - Couple from Kensington, Connecticut describe activities in eleven states and the island of Aruba.
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Massachusetts Letterboxes - Bonnie and Betsey Sennott offer clues to their boxes in Massachusetts.
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MommaFox and Bald Eagle - Anna and Paul offer clues to boxes in Connecticut, Massachusetts and Vermont.
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NeeDeep's State Stamp Letterboxes - Ambitious family project placing letterboxes in each state, patterned after the US quarters series.
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New England Area Letterboxing Gatherings - Mark and Sue's weblog of letterboxing events in New England.
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New Zealand Letterboxing - Clues, views, and news including boxes from Team Psychokiwi, Judi, Linton, and the Bunny.
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Oklahoma City Letterboxes by Dennis Williams - Clues to boxes in Oklahoma City as well as New Mexico, Alabama, and Costa Rica.
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Perfect Circle Letterboxing Guild - Family and friends offer clues to letterboxes in New Jersey and Pennsylvania.
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Ryan's Letterboxes - Personal page with clues for boxes placed throughout the western United States, as well as a few in Canada, Africa, and Central America. Also includes tips for improving the stamp quality.
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Silent Doug's Letterboxing Site - Articles including getting started, outdoor ethics, and explanation of cryptic letterboxer codes. Also includes list of boxes found and clues for boxes placed in the northeastern region of the United States.
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Silver Eagle's Letterbox Aerie - Clues to nearly 100 letterboxes that Silver Eagle has placed in North America, primarily in Texas.
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The Space Traveler - Family offers clues for Pennsylvania, New York and other states.
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Urban Letterboxing - Database of clues to letterboxes in urban locations, primarily in Europe.
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Wanda and Pete's Letterboxes - Clues for boxes placed primarily in Rhode Island, but a few in other states as well. Also includes logs of the movement of hitchhiker boxes, primarily in New England.
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What is Letterboxing? - Michelle Spalding offers a history of letterboxing in England and the United States with bibliography.
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Yahoo! Groups: Letterboxing Northeast - Discussion group for the northeastern US.
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Yahoo! Groups: Letterboxing USA - Discussion group for US letterboxers.
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NPR : Letterboxing - Radio host Linda Wertheimer and Thomas Johnston, an enthusiast in Washington, D.C., find a letterbox near the White House. [audio] (April 10, 2004)
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The Gazette: Letterboxing a Hobby of Inky Fingers and Hidden Treasures - Article on local letterboxing from chain of community newspapers near Washington, DC. (July 9, 2003)
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Washington Post: Thinking Inside the Box - Article by Caroline Kettlewell describes her discovery of the activity. (July 12, 2002)
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