Throwback: The truth about George Halas and the NFL's ban on black players - Windy City Gridiron
Throwing it back to the 1930s-40s. - Green Bay Packers
The discovery, mystery and controversy of the (possible) first 'Rams Horns' helmet - Sports Illustrated
NFL throwback uniform rankings: The 20 best vintage looks in the league
Green Bay Packers unveil new throwback uniforms for 2015
Green Bay Packers Riddell Speed Authentic Helmet - 1961-1979 Throwback – Green Gridiron, Inc.
Packers to wear throwback uniforms vs. Bills
Green Bay - HELMET HISTORY
Packers introduce history-inspired alternate uniform
Packers introduce history-inspired alternate uniform
Creating the best non-teammate offenses in Packers history - Acme Packing Company