Get a Grip The Hardball Times
marked balls The Baseball Collector
Pro Pitchers' Dirty Secret Rubbed On Every Ball : NPR
Baseball's secret ingredient? Mud - The Washington Post
Will MLB Say Goodbye to Lena Blackburne Rubbing Mud?
Worcester Red Sox Lena Blackburne baseball rubbing mud Polar Park
Harvesting baseball's 'magic mud'
Why does Major League Baseball seem to waste so many baseballs
Mud plays part in game of baseball - ESPN
Baseball Has a Dirty Little Secret: Lena Blackburne Rubbing Mud
Baseball Joe, Captain of the Team, by Lester Chadwick, a Project