MLB Says It Used 2 Different Balls in 2021, One Bouncier Than Other
3 True Outcomes in MLB are down for the first time in 17 years
Baseball changes by MLB harken back to dead-ball era - Sports
MLB commish responds to Justin Verlander's juiced-balls claim
Did MLB use juiced balls in 2020? - Sports Illustrated
The Evolution of the Baseball From the Dead-Ball Era Through Today
Did MLB use juiced balls in 2020? - Sports Illustrated
Dead Ball Era - The Death of Ray Chapman:A Turning Point in
MLB sends memo to clubs claiming 'no evidence' ball is juiced
Dead-ball era - Wikipedia