Athletes and activism: The long, defiant history of sports protests
Mo Rocca tells story of Moses Fleetwood Walker, who broke baseball's color barrier six decades before Jackie Robinson
The League' documentary chronicles the rise and demise of Negro League baseball
Philadelphia Phillies - Jackie paved the way.
Moses Fleetwood Walker - The New York Times
Moses Fleetwood Walker: Moses Fleetwood Walker: The Black player who broke baseball's color barrier six decades before Jackie Robinson
May 1, 1884: Fleet Walker's major-league debut – Society for American Baseball Research
Moses Fleet Walker: The First African-American to play Major League Baseball - The Tiny Activist
The Motion-Picture Inventor (a baseball & opera story)
The Ann Arbor Chronicle In the Archives: Dynamite Baseball Catcher
Moses Fleetwood Walker, Ohio baseball pioneer - Midwest Guest
Tony Mullane - Wikipedia
First black to play Professioal Baseball--Not Jackie Robinson