Immigration for Heyerdahl Schjøning Berg

Hello everyone! Is there anyone who can help me.? I am locking for information abouth Immigrant Heyerdahl Schjøning Berg who left Norway in 1916. He arrieved Long Island (New York) september 09 1916 s/s Bergensfjord from Stavanger. He was born juli 05 1880 in Norway and died 1970 ?? MN (I think).He married Magna Larsen, born 1888 in Norway. They had two children :Victoria born 1912, and Ethel born 1913 in Minnesota: I have no access to the føderal census so i can not find his familyrelation. I have a man named Heyerdahl Berg in Minnesotha death records for 1907 - 1996 but I am not sure if it is the right man. Questions :what am I do to do to find the right information for Heyerdahl and his family. I wonder, whwere did their doughter`s go and did they get their own familis?? Have I to be a member if I want to use the census for Minnesotha. I will be happy if anyone can help. Svein [:)]