The Evolution of the Baseball From the Dead-Ball Era Through Today

Eras of ERA – The Sport Journal

How Much Does a Baseball Weigh? - Baseball Weight Facts

How We Got Here. 19th century baseball and why it…, by John Thorn

Jerome Holtzman on Baseball: Jerome Holtzman: 9781582619767: : Books

The Deadball Era (Baseball in the 20th Century): Lankiewicz, Don: 9781466409705: : Books

The Rise and Fall of the Deadball Era – Society for American Baseball Research

The Continued Evolution of Baseball

2021, the Dead Ball Era 2.0? - Twinkie Town

Baseball changes by MLB harken back to dead-ball era - Sports Illustrated