Jackie Robinson Day: MLB's black population remains low
How Did Jackie Robinson Make History?
On Jackie Robinson's 100th birthday, baseball struggles to attract black players
The Sports Report: Team of Jackie Robinson had no African American players on roster during season - Los Angeles Times
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Baseball Demographics, 1947-2016 – Society for American Baseball Research
The 1950s Louisiana Law That Stalled Racial Progress in Texas Baseball
Jackie Robinson 75th anniversary hollow with MLB's lack of progress
Did racism kill Jackie Robinson? - Wausau Pilot & Review
Jackie Robinson Day: Major League Baseball has a problem
BAR 4.16.14: Honoring Jackie Robinson
Jackie Robinson was a game-changer on and off the field
Column: Remembering Jackie Robinson in town where it started - WTOP News