No. 42 jersey tribute began in 2007 with Griffey
How Many Ballplayers Does It Take to Screw in a Lightbulb?
FS: 1990s Griffeys, HOF Autos/Relics, Superfractors, 1/1s, Rare
Ken Griffey Jr's groundbreaking idea inspired Jackie Robinson Day
Remembering Jackie Robinson Day
In Robinson's shadow – The Denver Post
Ken Griffey Jr. had Jackie Robinson Day idea
A Measure of Respect for Jackie Robinson Turns Into a Movement
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Ken Griffey Jr. Started Wearing 42 on Jackie Robinson Day! #shorts