Design Psychology & North American Sports, by Jonathan Haines
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Chicago Bears Memorial Logo - National Football League (NFL) - Chris Creamer's Sports Logos Page
Does the NFL sue for using team logos without permission ? - Quora
Chicago Bears Helmet - National Football League (NFL) - Chris Creamer's Sports Logos Page
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Cincinnati Bengals Alternate Uniform - National Football League (NFL) - Chris Creamer's Sports Logos Page