John & Julia Sampson (Samuelson)

[:)]Hello All: I am new to this forum and am searching for a link to finding the ship my ancestors came over on from Norway. I'm looking for a John (maybe Johann/Johannes) Sampson (may be Samuelson) and his wife Julia (Anderson (Andersdotter???)). They came over in late April 1872 based on what we know...with two daughters. Anni, born about 1866 and Gertrude born 3/13/1867. Another daughter, Sarah, was reportedly born on ship, April 30 1872 so if that's true, that's when they'd be enroute. They settled in Eau Claire Wisconsin but that may not have been their destination at the time they set out. If anyone can help steer me in the right direction I'd be most grateful. I'm trying to find the ship they came over on and, subsequently, learn what farm they came from and where in Norway. Many thanks to anyone who may be able to help.[:D] Warm regards, Jackie Peterson