Pederson from Norway

I am looking for info on Martin Pederson born 1883 in Hen Buskerud, Norway and Charlotte Otilla Pederson born June 16, 1882 in Fredrikstad, Norway. They came to America sometime between 1883 and 1912 when Joseph Pederson was born July 29, 1912 in Makoti, N. Dakota, U.S.A. They lived in Rural Makoti, N. Dakota. Any information I can get will be appreciated. I know nothing about the parents of Martin or Charlotte but I do know they had the same last name before they were married.