Thornton Research Library has a large selection of documents and photographs on the history of Fond du Lac County. The list of resources is updated on a regular basis. Library Hours are Wednesday, Thursday, and Friday from 11 a.m. to 3 p.m. Other times by appointment. For additional information contact us at 920-922-0991 or email us at

The following is a partial list of indexes to the materials held in the library.