I believe my husband is related to the Lerum you are looking for. He is from the Keyeser area which is where Spring Prairie is located. I believe he is decendants of the ones you are looking for. His Grandfather was Christ Lerum who was married to Bessy Anfinson. His father was Clarence the brothers were Sanford and William. I believe his Gr Grandparents were Solomon and Ann(Lee) Lerum. There was a tie to a Grove and maybe a Berge. I am just starting to search for his family.