I don't know if this W. M. Sellman is the one who wrote the book some of you have alluded to or not, but he wrote nine pages of Sellman information for the "Historical Collections of Adams County, Ohio". He starts with Johnwho emigraged to Maryland in 1658. He and wife, Elizabeth were parents of nine children, of whom two sons,John and William and three daughters, Elizabeth, Margaret, and Ruth married and had families. William's son Thomas is the ancestor of the Adams County Sellmans. There are just a few death dates after 1900, but if you have questions I can look up for you, I will be glad to do it. I do not personally have a Sellman line.