History of the Pittsburgh Steelers - Wikipedia
Which NFL team had the most intimidating defense? - Quora
1933 Pittsburgh Pirates (NFL) season - Wikipedia
Pittsburgh Pirates - Wikipedia
1932 Pittsburgh Panthers football team - Wikiwand
1940's Pittsburgh Steelers adapt to survive
History of the Pittsburgh Steelers - Wikipedia
Joe Greene Biography, Steelers, Coke Commercial, & Facts
Pittsburgh Steelers History. Born in 1933.
Winged football helmet - Wikipedia
Notre Dame Fighting Irish, American Football Wiki
List of NFL champions (1920–1969) - Wikipedia