| All American Trail Running Association (AATRA) - Membership application and extensive collection of links and information on events, trails, equipment, and race results.
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| Trail Runner Magazine Online - Running, health, travel, and training, race results and race event calendars.
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| American Discovery Trail - Learn about the first running trail that crosses the entire nation.
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| New England Trail Runner - Extensive listing of New England area trail racing and running information on the web. Includes race results posting and trail running club information.
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| Peak Trail Runner - A guide to trail running in the UK Peak District national park.
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| Run Hayward Hills Trails - Trails of Hayward, California. Great for running and riding ATB.
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| Mountainrunning.com - Rocky Mountain trail guides with maps and descriptions. World mountain running trophy information on venues, maps, results. Guide to trail accommodations available.
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| Northern Arizona Trail Runner's Association - Promotes trail running in Northern Arizona, in the United States. Contains a listing of upcoming races, related links, history of the organization, pictures, membership details, race summaries, and message board.
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| BC Trail Running - Offers information on trail running in British Columbia, Canada. Includes articles, photos, and links to several trail series.
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| Team Gloucester - Trail running club in Gloucester, Massachusetts. Cape Ann trail information and maps as well as an extensive trail race calendar for New York and New England.
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| Redwood Trails - Information on a series of trail runs in the Bay Area of California. Race distances range from 5k to the marathon.
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| USTrailrunner - Includes gear reviews, race calendar, online store, and discussion board.
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| Perry Scanlon's Home Page - Contains photos and links to trail and workout information near Palm Springs, California, as well as specific information for the Skyline Trail.
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| Irish Mountain Running Association - Irish mountain running. Trails, races and links on the Island.
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| Shenipsit Striders - Trail running club in Somers, Connecticut, sponsoring the Soapstone Mountain races as well as weekly training runs. Includes race information and results, photos, and links.
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| Gil's Athletic Club - Trail running club based in Topsfield, Massachusetts, sponsoring several trail races (primarily ultras). In addition to race information, includes weekly runs, guide to area trails, and photos.
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| Albany Running Exchange - Trail running club based in Albany, New York. Includes summer trail run series, results, calendar, photos, and member news.
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| Western Mass Athletic Club - Trail running club in western Massachusetts. In addition to club news, includes information for several trail and snowshoe races as well as the Grand Tree Trail Race Series.
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| eHow to Choose Trails for Trail Running - Tips and information about trail running. Requires free membership.
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