Hartmann/Larsen to USA

Hi- I'm searching for any passenger/ship info for Soerren Andrew Hartmann and Ragna Emilie Larsen - my great-grandparents - who were born in Oslo and Drobak between 1852-1861, and who both died in the USA. I have some info about their parents' birthplaces, also Oslo and Drobak, and would appreciate any additional details. Thanks so very much!