Jackie Robinson in 1947: Debut with the Dodgers – Society for American Baseball Research
The Doc File: Guts Enough Not To Fight Back: Jackie Robinson
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Mr. Rickey asks Jackie Robinson if he has the “guts” not to fight back. What does he mean by this? - Quora
The Guts Not to Fight Back: Jackie Robinson - Home
Jackie Robinson National Postal Museum
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The Breakthrough: In May 1947 Jackie Robinson proved he belonged in the bigs - Sports Illustrated