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After Jackie Robinson, MLB integration was halting - The Washington Post
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The only day MLB players can wear No. 42? Jackie Robinson Day
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TIME for Kids
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April 15, 1997: Ken Griffey Jr. wears number 42 to honor Jackie Robinson on 50th anniversary – Society for American Baseball Research
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MLB celebrates Jackie Robinson Day, calls for justice continue - WHYY
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What more should MLB do to make real impact on Jackie Robinson Day? - Fish Stripes
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Column: Meet Ray Lamb, the last Dodger to wear Jackie Robinson's No. 42 — by mistake - Los Angeles Times
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Jackie Robinson Day in MLB: Son delivers powerful message to Dodgers
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Why Jackie Robinson's story still resonates 75 years after his MLB debut - ESPN
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Last player to wear No. 42 for each MLB team
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Angels and Mariners lock arms in show of support on Jackie Robinson Day – Orange County Register
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The Only Day MLB Players Can Wear No. 42 » Britannica
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Jackie Robinson Day - Wikipedia
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MLB players honored to wear Jackie Robinson's No. 42