Take a closer look at what pine tar is, the historical origins of MLB’s pine tar rules, and a series of infamous baseball incidents involving the sticky, brown stuff.
Should we care if pitchers use pine tar?, Bronx Pinstripes
Royals rage: George Brett 'pine tar' game was 40 years ago
A field guide to pitchers using pine tar
Pine tar and The Police: New York's stadiums part of pop culture lore
Reds' Sonny Gray finds creative way to remove pine tar from hand
Pineda says it's dirt, not pine tar, on right hand
The 'Pine Tar Incident' remains one of the craziest stories baseball has ever told
Dustin Ackley is probably violating the pine tar rule - Lookout Landing
Pine tar and The Police: New York's stadiums part of pop culture lore
An oral history of the Pine Tar Game - Sports Illustrated
How the Pine Tar Game ended
Pine Tar in Baseball: What It Does, Using It & Rules
The History of Pine Tar – Packer's Pine
Baseball's Sticky Secrets
Pine Tar Baseball