I'm looking for information on Mary SPERLING, a German-Russian born Jan 1864, immigrated to the US 1874. She married John COOP/KOOP/COUPE in 1879. In 1880, they are shown in the Turner County Census for Dakota Territory. By 1900, they had moved to Logan County, North Dakota. John and Mary had 11 children: Susan, Cornelius "Louie", Eva, Margaret, John, Mary, Henry, Elizabeth "Lizzie" who married Arthur Fortin, Sara Jane who married William Andrews, Bertha who married a Miller, and Annabelle. I would appreciate hearing from you if you can tell me more about the ancestry of this family, or suggest avenues of research. Thanks for your time.