| American Baseball Coaches Association (ABCA) - A nonprofit organization having more than 5,000 members, including coaches from every state in the country and over 200 international members.
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| Major League Baseball Players Alumni Association - Organization of former players. Features information, history, and news of the organization's activities.
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| The United States Amateur Baseball Association. - The USABA is here for the promotion and development of the players and fans in youth baseball pastseason tournament competitions at state, regional, and national level.
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| American Federation of Umpires(AFU) - Group of baseball and softball umpires who share the common goal of consistent improvement in their officiating skills and knowledge of the game. Features clinics, a newsletter, and various resources.
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| Amateur Baseball Umpire Association - An umpire information center. Umpire associations, umpire equipment, umpire rules; a resource center for umpires to find and share information.
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| American Amateur Baseball Congress - Coordinates play among US leagues in seven age brackets, from sub-teens through adults. Includes rules, tournament dates, and list of regions and age divisions.
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