Jackie Robinson's No. 42 is retired to honor the man who broke the color barrier in baseball in 1947.
42: Jackie Robinson Day - We R Tacoma
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The Only Day MLB Players Can Wear No. 42 » Britannica
After Jackie Robinson, MLB integration was halting - The Washington Post
MLB players to wear #42 Monday to honor Jackie Robinson Day
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It's a huge privilege' to wear Jackie Robinson's No. 42
Calls for justice continue as baseball celebrates Jackie Robinson Day - The Boston Globe