Michael Gershman, Diamonds: The Evolution of the Ballpark, Houghton Mifflin, 1993. Stew Thornley - Baseball in Minnesota: The Definitive History External links Downtown Ballpark on Sanborn map, 1904 External links Minnesota ballparks Stew Thornley essays for SABR Nicollet Park and others Rich Arpi essay for SABR Sanborn map including St. Paul downtown park, 1904 - near upper right corner Minneapolis Baseball baseball parks