I can't believe it!!! I have been researching Oliver Olsen or Oliver Oleson for the past month. I cannot find a birth record. I am doing the research for a cousin (actually first cousin once removed). I found the 1865 census report for Arendal in Aust Ogder. It matches what my cousin told me verbally. He was born in Bergen in about 1841. He was single and was a "Smedsvend" or journeyman smith.
I have a birth record for an Oliver Oleson born in Sogn og Fjordane in 1841. THat's about 140 km from Bergen. I have a military record for that same Oliver Olson and also a draft record of an Oliver Edward Olson born in Bergen in 1865. THe curator of the Bergen archives couldn't find an Oliver Olson born in Bergen in 1841. He hasn't gotten back to me, but I'm hoping to hear from you. Maybe you're related to my cousin. He has information on Jensina Jensen.
I have a voter registration for an Oliver Olson. If it's the correct Oliver he immigrated in about 1872. I'm attaching that file. If you want to contact me by e-mail my address is firstname.lastname@example.org