Don't know about the Historical Society, but London,Oh, the couonty seat has a fairly good collection of records about Madison county residents. I've used the records to establish some of my PURNELL ancestors. Thats's the court house in London, Oh. I-71 soouth to rooute #56 exit west. I think it used to be the "Midway exit" London is about 12 miles off the Interstate. Hope this helps, Jim Purnell