Ole O Godtland and Olivia A Norgaard

Ole O born Jul 1835 (according to the 1900 census in Iowa), wife Olivia A born Dec 1843, both born somewhere in Norway. Supposedly they emigrated about 1867, were married around 1864 in Norway. They both died in Winnebago Co, Iowa. Obviously, I'm searching for any information on them. Since they're husband and wife, I thought it would be better to keep it in the same topic....