Big Green Umbrella Media, Inc.
Wrigley Field historical sleuthing: 1960s edition, and a mystery - Bleed Cubbie Blue
List Madison County Public Library
Cubs historical sleuthing: 1947 edition - BVM Sports
CiteSeerExtractor/resources/database/words at master · SeerLabs/CiteSeerExtractor · GitHub
Cubs historical sleuthing: Bill Buckner edition - Bleed Cubbie Blue
Cubs historical sleuthing: 1960s scoreboard edition - Bleed Cubbie Blue
Cubs historical sleuthing: 1980s edition - Bleed Cubbie Blue
John Racanelli – SABR's Baseball Cards Research Committee