History of Wrigley Field - Wikipedia
Wrigley Field historical sleuthing: 1938 aerial edition - Bleed Cubbie Blue
Cubs Historical Sleuthing: Wrigley Field Photo Edition - Bleed Cubbie Blue
Wrigley Field historical sleuthing: 1960s edition - Bleed Cubbie Blue
Wrigley Field historical sleuthing: 1916-22 edition - Bleed Cubbie Blue
Wrigley Field historical sleuthing: 1916-22 edition - Bleed Cubbie Blue
Wrigley Field historical sleuthing: Really small photo edition - Bleed Cubbie Blue
Chicago Sports Historic Photos: Wrigley Field History - Bleed Cubbie Blue
Wrigley Field historical sleuthing: 1950s edition - Bleed Cubbie Blue
Wrigley Field: A Century of Survival – Society for American Baseball Research
Baseball history unpacked, October 4 - Bleed Cubbie Blue