Business records of eight cooperatives in which Olson was an active member: Dairyland Power Cooperative, Wisconsin Electric Cooperative, Wisconsin Electric Cooperative Association, Wisconsin Association of Cooperatives, Wisconsin Federation of Cooperatives, Insurance Cooperative Agency, Badger Electric Cooperative, and Barron Electric Cooperative, spanning thirty-three years of cooperative development in Wisconsin. The records consist mainly of board of director's minutes, committee minutes, and reports, engineering reports, financial statements and annual and district meeting material. The records of Dairyland Power Cooperative dominate the collection. Also included are a few biographical items primarily referring to Olson's successful 1949 campaign for the Wisconsin State Senate as a Democrat representing Barron, Polk, and Dunn counties.
