Yankee Stadium, New York Yankees ballpark - Ballparks of Baseball
VTG Official New York Football Giants Polo Grounds Program November 18 1951
NFL in Ballpark Series Polo Grounds, Manhattan, NY, November 18, 1934 – Chicago Bears 10, NY Giants 9
Polo Grounds - history, photos and more of the New York Giants former ballpark
Why didn't New York City convert Polo Grounds into a football-only stadium for the NFL Giants/Jets instead of demolishing it? It's bathtub shape and capacity would fit the AFL-NFL requirements. - Quora
Football Hosts Lehigh for Homecoming on Saturday - Fordham University Athletics
Polo Grounds - history, photos and more of the New York Giants former ballpark
Yankee Stadium 100 years: History of iconic baseball field, Babe Ruth
Uncle Mike's Musings: A Yankees Blog and More: September 29, 1957: Giants Leave Polo Grounds, Packers Open Lambeau Field
Before and After, New York Giants Stadiums (31/32): Yankee Stadium, Yale Bowl, Giants Stadium, and MetLife Stadium : r/nfl
Classic Shots of the Polo Grounds - Sports Illustrated