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Major League Baseball rubs its balls in Jersey mud
After rubbing mud on baseballs for nearly a century, MLB is trying something new
Magic Mud Baseballs
UI Press, Nathaniel Grow
Rubbing Mud Archives - Page 5 of 27 - Baseball ProspectusBaseball Prospectus
Major League Baseball rubs its balls in Jersey mud
Lena Blackburne rubbing mud a secret of the game
After rubbing mud on baseballs for nearly a century, MLB is trying something new