I believe it is possible that James Martin is James Joseph Martin b. 1841 in Osage Co MO and in the 1860 census age 19 Maries Co. He is not in the 1870 census. I'm currently extracting the 1880 census for Osage County finding him there with his wife Sarah Ellen would prove or disprove this theory. Does anyone have what happened to Joseph Martin b. 1841 son of George Martin and his wife Mary.. Another possibility is p. 277 King's History of Maries Co MO, Brazeal Coffee killed during the civil war, his widow married James Martin and went to Oklahoma. So you might look for James martin in Olkahoma in 1880 census. Meg