What were the original NFL teams?
Why It Took So Long for Two Black QBs to Face Off in the Super
NFL's All-Decade Team of the 1960s - OFFENSE
How the NFL took over America in 100 years - ESPN
History of the National Football League - Wikipedia
American football - College, Golden Age, Rules
Ranking NFL's greatest dynasties of the past six decades: Patriots
NFL owners, illustrated: Who's who in the class of founders and
From the NFL Archives: Turn of the Century Through the 1920s
Player treatment survey ranks NFL teams: Here's who tops the list
A Complete List of NFL Champions Since 1920
A look at the first decade of the NFL, the 1920s
NFL's 1st decade was the 1920s, when teams came and went
Fritz Pollard: An African American founding father of the NFL
Muncie was in at NFL's ground floor