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Mariners at forefront of establishing Jackie Robinson Day
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Last player to wear No. 42 for each MLB team
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42 facts about Jackie Robinson to celebrate the 75th anniversary of his breaking the color barrier
![Why every MLB player is wearing No. 42 today](https://www.usatoday.com/gcdn/presto/2019/07/20/USAT/3debfbd2-ad12-4642-8ef0-6ec4960c213d-USATSI_12945297.jpg?crop=2205,1241,x603,y0&width=2205&height=1241&format=pjpg&auto=webp)
Baseball Hall of Fame: Best player with every uniform number
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MLB celebrates Jackie Robinson
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Jackie Robinson Day Celebrations for 75th Anniversary of MLB Debut
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The Best Players Not Named Jackie Robinson to Wear No. 42 in MLB
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MLB Network - Wearing the number 42 was a tremendous honor
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Jackie Robinson Day - Wikipedia
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Jackie Robinson Day: 4 Facts About His Jersey No. 42, Now Retired in MLB
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Angels and Mariners lock arms in show of support on Jackie Robinson Day – Orange County Register
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Photos of the Day: April 15 - WSJ