|1911||C||Akron Champs, Canton Deubers, East Liverpool Potters, Erie Sailors, Mansfield Brownies, New Castle Nocks/Sharon Travelers, Steubenville Stubs, Youngstown Steelmen|
|1910||C||Akron Champs, Canton Deubers, East Liverpool Potters, Erie Sailors, Mansfield Reformers, McKeesport Tubers, New Castle Nocks, Youngstown Steelmen|
|1909||C||Akron Champs, Canton Watchmakers, East Liverpool Potters, Erie Sailors, McKeesport Tubers, New Castle Nocks/Alliance, Steubenville Stubs, Youngstown Indians|
|1908||C||Akron Champs, Canton Watchmakers, East Liverpool Potters, Girard/Butler/Erie Sailors, McKeesport Tubers, New Castle Nocks, Sharon Giants, Youngstown Champs|
|1907||C||Akron Champs, Lancaster Lanks, Mansfield Pioneers, Marion Moguls, New Castle Nocks, Newark Newks, Sharon Giants, Youngstown Champs|
|1906||C||Akron Rubbernecks, Lancaster Lanks, Mansfield Giants, New Castle Outlaws, Newark Cotton Tops, Sharon Steels, Youngstown Ohio Works, Zanesville/Marion Moguls|
|1905||C||Akron Buckeyes, Barberton Magic Cities, Braddock Infants, Bucyrus Bucks, Butler Bucks, Canton Protectives, Homestead Steel Workers, Kent Kings,
Lancaster Lanks, Lima Lees, Massillon Farmers, McKeesport Colts, Mount Vernon Clippers, Newark Idlewilds, Niles Crowites, Sharon Steels,
Steubenville Factory Men, Washington Patriots, Wooster Trailers, Youngstown Ohio Works, Zanesville Moguls
Historical performance data for professional leagues (affiliated minor leagues, independent minor leagues, fall/winter leagues, and other international leagues) is provided by and licensed from 24-7 Baseball and Chadwick Baseball Bureau. It incorporates the work of many stalwart baseball researchers, including Cliff Blau, Art Cantu, Frank Hamilton, Reed Howard, Kevin Johnson, Bob McConnell, Jack Morris, and Ray Nemec, as well as members of the Minor Leagues Committee of the Society for American Baseball Research.
Perhaps most importantly, it builds upon the seminal work of Ed Washuta, who magnanimously provided the framework to make the whole thing possible.