Polo Grounds - Wikipedia
Heritage Field opens on old Yankee Stadium site - Ballpark Digest
Architect Breaks Down Iconic Baseball Stadiums
Yankee Stadium (1923) - Wikipedia
As the end of New York's stadiums nears, memorabilia questions pop up - Sports Collectors Digest
A Brief History: Yankee Stadium, Bronx Pinstripes
Yankee Stadium
Old Yankee Stadium - New York Yankees
Old Ballparks
Online: Cooperstown Chatter: The New Yankee Stadium Takes Its Bow – Marty Appel