The Cubs' road uniforms had centered numbers in 1972. Here's why
Revealed: The Story Behind the Cubs’ 1972 Road Uni
An Overview Of Cubs Road Uniforms 1958-2015 - Bleed Cubbie Blue
The history of Houston's iconic rainbow uniforms is a story worth telling - ESPN
MORE
An Overview Of Cubs Road Uniforms 1958-2015 - Bleed Cubbie Blue
Minnesota Twins Beat Astros In Game 2, Ties ALDS
Heritage Uniforms and Jerseys and Stadiums - NFL, MLB, NHL, NBA, NCAA, US Colleges: Chicago Cubs Uniform and Team History
Uni Watch - MLB firsts and lasts - ESPN
MLB Jersey & Cap History
Kasey's Cubs Uniform Number Main Page