Rockford Industrial Athletic Association – R. I. A. A.
In the 1913 Factory League: Andrews Wire, Kurtz Action, Free Sewing Machine Company, Hess and Hopkins, Barber-Colman, and Trahern Pump Company
In the 1913 Commercial League: Rockford Malleable, Clark Manufacturing Company, Rockford Watch Company, Central Union Telephone, Printers, and Burson Knitting Company
Source: Rockford Morning Star, 08/13/1913, also in Rockford Public Library’s “Rockfordiana” files, “R. I. A. A.”