AC100 RaceBook - The official record and program of the Angeles Crest 100 Mile Endurance Run. Includes course and driving maps for runner and crew. 1986-2001 information.
American Ultrarunning Association - Membership details, race listing, USA National Ultra Team, description of the organization and related links.
Cascade Running Club - Hosts 100 mile, 50 Mile and 50K minimalist runs in Washington. Includes club information and race details.
Endurance Sport Club - International organization, based in Canada, that sponsors a number of fat-ass style ultra-races. Includes membership information and race calendar.
Extreme Ultrarunning - Resources, links, and general information. Includes runners' profiles, calendar, photographs and race reports.
International Association of Ultra Runners - Provides organizational information, newsletters, race listing and coming events, training tips, and links. English and Chinese versions.
Kansas Ultrarunners' Society - Includes event descriptions, member biographies, pictures, newsletters and membership information.
Kevin Sayers UltRunR Site - Resources and opinions on topics ranging from training and racing tips to equipment recommendations.
Marathon and Beyond - Published six times a year - website contains tables of content, sneak previews and ordering information.
Multidays.com - Resource for multi-day events with calendars, news, results, and training information.
New York Ultra Running - Contains details about races in the area, highlights, pictures, directions, and membership details.
North Texas Trail Runners - Information on trail running and ultra running in North Texas. Features calendar listings and a news/opinion section.
Sri Chinmoy Marathon Team International - Sponsor of multi-day races, including the world's longest certified race of 3,100 miles, triathlons, and many ultra events in more than 30 nations. Includes news, photos, race information, library and links.
Sri Chinmoy Marathon Team New York - Multi-day events, including an annual 3,100-mile race. Information on upcoming races and events, articles, and contact information.
Stan Jensen's Ultramarathon Guide - Provides general information on the sport, especially focusing on northern California. Includes information and statistics for the top races in the USA, as well as personal achievements, and goals.
Ultra Adventures - Comprehensive regional ultrarunning resource focusing on North Carolina and the Mid-Atlantic region.
UltraOz - Includes news, links, and race descriptions.
UltraRunner.net - Resource for clubs and races in North America with upcoming events, pictures, related links, mailing list and course descriptions.
Will Brown's Umstead 100 Report - 2001 - Will Brown conquers the 100 mile distance at the 2001 Umstead 100 Mile Run in Umstead State Park, Raleigh, North Carolina, April 7-8, 2001.