Ballparks Yankee Stadium Old - This Great Game
Ballparks Polo Grounds - This Great Game
Yankee Stadium: The ultimate guide to the Bronx ballpark - Curbed NY
Great American ballparks: Diamonds are forever - Los Angeles Times
MORE
Yankee Stadium College Football history
Yankee Stadium
Clem's Baseball ~ Yankee Stadium
SABR Digital Library: Yankee Stadium 1923-2008: America's First Modern Ballpark – Society for American Baseball Research
MLB ballparks ranked: Oldest, biggest and most expensive – NBC Sports Boston
MLB parks from oldest to newest