Crossing Baseball's Color Line - Jackie Robinson: Breaking the Color Barrier
Crossing the Color Barrier: Jackie Robinson and the Men Who Integrated Major League Baseball - LA84 Foundation
Baseball color line - Wikipedia
Remembering Jackie Robinson's historic play breaking the color line 75 years ago, Richmond Free Press
Baseball, the Color Line and Jackie Robinson
Crossing the Color Barrier: Jackie Robinson and the Men Who Integrated Major League Baseball - LA84 Foundation
The Drawing of the Color Line, 1867, by John Thorn
1962 to 1972, Baseball, the Color Line, and Jackie Robinson, Articles and Essays, By Popular Demand: Jackie Robinson and Other Baseball Highlights, 1860s-1960s, Digital Collections
Baseball color line - Wikipedia
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Before Jackie: Baseball's Color Line – Society for American Baseball Research