•Information provided by Description and Utilization of the Sanborn Map, Sanborn Map Company, 1953, Geospatial Resources & Map Collection, Ball State University Libraries; and Fire Insurance Maps:  Their History and Applications, Diane L. Oswald, Geospatial Resources & Map Collection, Ball State University Libraries.
•An interactive Sanborn® Fire Insurance Map key is located at http://dlg.galileo.usg.edu/sanborn/Help/SymbolsColors/