Andreas Christian Larsen (Larson)& Olena Evensdttr

I am searching for information about my great grandfather Andreas (Andrew) Larsen (Larson (1849-1905) and his wife Olena. I think he was born in Heskestad, Rogaland, Norway. He emigrated to US in about 1869. His wife Olena Evensdatter (1850-1925) was possibly born in Loiten, Norway. They married in 1871 according to 1900 US Census. They lived and died in Dodgeville, Wisconsin. I would like any info you can find: parents' names, locations, siblings. Thank you.