Major League Baseball : The Official Site
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Features coverage including audio and video clips, interviews, statistics, schedules and exclusive stories about the great American pastime.
http://mlb.mlb.com/
Minor League Baseball
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The official site of Minor League Baseball. Includes listings of all of Major League Baseball's farm teams.
http://www.minorleaguebaseball.com/
Science of Baseball
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Exploring the Science of Baseball. Brought to you by the Exploratorium.
http://www.exploratorium.edu/baseball/