From "History of La Crosse County, Wisconsin", 1881, p. 770. City of La Crosse O. LARSEN, of the firm of O. Larsen & Co., contractors and builders and dealers in sash, doors, moldings, lumber, etc., No. 9 South Fourth street, was born in Norway in 1838; son of Lars Olesen. He served five years at the joiner's trade in Norway, commencing when 15 years old, and followed the business in Norway till 1866; then came to America, and has been in business in La Crosse ever since. He was married in Norway in 1862, to Randine Andersen, and has seven children - Annie (or Ingeborg), Julia, Anthon, Louis, Clara, Emma and Tilla. His partner is Martin R. Hansan, of Centralia, Wood Co., Wis. Mr. Larsen was five years in the Norwegian army, and was a Sergeant in Hedemarske Corps, 1st Brigade. [I am not related to this family and have no further information. I'm posting this as a service and hope it helps!]