The Cubs' road uniforms had centered numbers in 1972. Here's why

An Overview Of Cubs Road Uniforms 1958-2015 - Bleed Cubbie Blue

Colors, caps and logos: 113 years of Cubs uniforms

Wrigley Wax: #23 - Carmen Fanzone

Ron Santo - Wikipedia

The rule of thirds and '08 Stadium Club

Wrigley Wax: #23 - Carmen Fanzone

Here is what kind of uniforms the Cubs were wearing

Every member of the 3,000-hit club

Heritage Uniforms and Jerseys and Stadiums - NFL, MLB, NHL, NBA, NCAA, US Colleges: Chicago Cubs Uniform and Team History

The Cubs' road uniforms had centered numbers in 1972. Here's why - Bleed Cubbie Blue