Jackie Robinson Day: The only time MLB players can wear No. 42
April 15, 1997: Ken Griffey Jr. wears number 42 to honor Jackie Robinson on 50th anniversary – Society for American Baseball Research
Yankees are glad to be on the field for Jackie Robinson Day – New York Daily News
Sports Heroes Who Served: Baseball Great Jackie Robinson Was WWII Soldier > U.S. Department of Defense > Story
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Robinson's 42 In Dodger Blue For All Uniforms On April 15
Dodgers manager Dave Roberts saving his sentimental side for Jackie Robinson Day – Orange County Register
Jackie Robinson Day: A celebration that should be remembered every day
Jackie Robinson Day - Wikipedia
Major League Baseball celebrates Jackie Robinson Day – The Denver Post
MLB players to wear #42 Monday to honor Jackie Robinson Day
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