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NJ - Lambertville: Lena Blackburne's Baseball Rubbing Mud
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Sign-stealing: A history of MLB's tricks of the trade - Sports
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2010 Rutgers Baseball Media Guide by Rutgers Athletics - Issuu
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Why do they put mud on baseballs before MLB games? - AS USA
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Lena Blackburne rubbing mud a secret of the game
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TIL that every ball used in an MLB game is covered in mud that
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Major League Baseball rubs its balls in Jersey mud
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Mud plays part in game of baseball - ESPN
![Rubbing Mud: The Hidden Relief Ace - Baseball ProspectusBaseball](https://baseballrubbingmud.com/images/open1lb.jpg)
Lena Blackburne Baseball Rubbing Mud
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Count on pitchers continuing to use pine tar - ESPN
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Delaware River Basin Commission