The Marysville, OH library has data on the Spain family including an extensive genealogical compilation. They also have copies of the Union Co. Echo and the Bouic index of Union Co. residents. Kim Clark is the researcher: firstname.lastname@example.org You can buy back copies from the UCGS chapter.
I have some data on Elizabeth Heminger who married Jefferson Spain. I down loaded the Spain tree you placed on RootsWeb and doubt that I have much to add. If I can help. Email me at email@example.com