The NFL thrives because of adaptation and parity. Thank Bert Bell
Did you know that Frankford used to have its own NFL football team
Football (Professional) - Encyclopedia of Greater Philadelphia
NFL Resurrected: Frankford Yellowjackets Philadelphia's original
How the Philadelphia Yellow Jackets became the Philadelphia Eagles
A lost opportunity for Sidney Jones in Roob's 10 Observations
Historic hits - Northeast Times
The Eagles First Iconic Signal Caller - Philadelphia Sports Nation
John Salzman on X: OTD July 9, 1933. Frankford Yellowjackets
Heritage Uniforms and Jerseys and Stadiums - NFL, MLB, NHL, NBA
Frankford Yellow Jackets, Pro Sports Teams Wiki