On This Date: Ken Griffey Jr. Makes Major League Debut, by Mariners PR
Griffey stars in debut for Mariners
April 15, 1997: Ken Griffey Jr. wears number 42 to honor Jackie Robinson on 50th anniversary – Society for American Baseball Research
Ken Griffey Jr. - Wikipedia
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April 3, 1989: Ken Griffey Jr. makes major-league debut for Mariners – Society for American Baseball Research
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On This Date: Ken Griffey Jr. Makes Major League Debut, by Mariners PR