Jackie Robinson played for KC Monarchs before MLB debut
Jackie Robinson in 1945: From Boston 'Tryout' to a Negro Leagues Star – Society for American Baseball Research
Jackie Robinson's debut a win for the Dodgers and for baseball - Sports Illustrated
Jackie Robinson: Kansas City Royal, by Nick Kappel
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Jackie Robinson had some history in Philadelphia through his Negro League stint with Kansas City ~ Philadelphia Baseball Review - Phillies News, Rumors and Analysis