Just returned last week from photo trip to Tennessee looking for Leonard/Barbara and Isaac/Mary gravesites. If anyone is interested, I have photos to share. Will set resolution of photos to whatever you want (low for email, high [on CD]for printing).
Isaac's gravesite is not easy to find, probably impossible without directions. Little cemetery was all grown up when I was there. Isaac's stone, like Leonard's monument, is a modern replacement by descendants.