FightingDirectory.info is a great resource containing links related to Chinese martial arts, Korean martial arts, Japanese martial arts, martial arts services, aikido, karate, taekwando, muay thai, chung moo doe, tang soo do and more.
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Infrequently Asked Questions: Sumo
Heights and weights, salaries and allowances, details of all tournaments held since 1909. Plus many other questions answered that were never asked before.
Sumo Information
Features a comprehesive FAQ that details various aspects for the sport, from historical to technical. Also includes results of past events, and searchable statistics.
The American Sumo Association
Educating current and future fans on the Japanese sport of Sumo. Includes history, rules, rankings and American competitors.
SumoForum.net
Includes several topics for discussion and reference material.
Rowy's Sumo Site
A collection historical sumo articles in English from various newspapers from Japan, dates 1800's to the 1990s.