Solberg, Mathias and emigration from Norway

My Great Grandfather Mathias Solberg was born November 23, 1855 in Norway and emigrated to the US in 1882. They arrived in Pembina County, Dakota Territory in July of 1882. He married Gina Johannesdatter in Norway in about 1878. They had 2 sons before leaving Norway - Christian in 1878-79 and John in 1881. I do not know of any other family members from Norway. I can only track the US born family after Mathias and Gina. Any help would be appreciated.[/font=Times New Roman]