Hi Janice, I don't have a copy of the Mercer marriage book, but the name rang a bell, because I have an old snapshot taken in Mercer County said (by the sender of the photo) to show Ida B. Hearn with several of the children she helped raise. It was said she was the daughter of George Setser Lee and Julia Stewart. A birth date for Ida would be about 1869. Does this sound the Ida Hearn you are inquiring about? Dave