The Dauvray Cup, baseball's first world championship trophy [source: John Thorn's Our Game]
Polo Grounds - history, photos and more of the New York Giants former ballpark
Game Worn by Smithsonian Magazine - Issuu
NEW YORK CITY - Polo Grounds III (55,000, 1890 - 1964), Page 4
Magnus New York City History
Polo Grounds, Baseball Wiki
The First and Last Games at the Polo Groundses – Society for American Baseball Research
The Polo Grounds, The Lost Ballpark of New York's First Baseball Team - Untapped New York
Polo Grounds – History of New York City
Game Worn by Smithsonian Magazine - Issuu