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Here's a sampling of the myriad protocols in place for the 2021 MLB season - The Boston Globe
From Bands to Basketball, Face Mask Merch Has Arrived
Depleted by coronavirus, Marlins prepare to return as emblems of a fragile season
Masks halt COVID, but pro-sports athletes are divided on wearing them
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Which MLB Teams Are Wearing Team-Branded Masks?
Canty: No custom facemask and shield 'means I can't play'
MLB tightening virus protocols, including mandated masks in bullpen and dugout
Major League Baseball to Players and Staff: Wear Mask or You're Out!