Jackie Robinson Day (2004-2022)
Ken Griffey Jr. Started Wearing 42 on Jackie Robinson Day! #shorts
April 15, 1997: Jackie Robinson's Number Retired
Ken Griffey Jr. – Society for American Baseball Research
Remembering Jackie Robinson Day
still left standing
Jackie Robinson's Battles for Equality On and Off the Baseball
April 15, 1997: Jackie Robinson's Number Retired
The rule of thirds and '08 Stadium Club
Maybe one day we will all wear 42. That way they won't be able to tell
Ken Griffey Jr's groundbreaking idea inspired Jackie Robinson Day