The Eugene G. Wanger papers consist of unpublished manuscripts, Ingham County Historical Commission materials, R.E. Olds Museum papers, Ingham County Government papers, Michigan State Government papers, Republican political material, United States Government papers, and Tri-County Regional Planning Commission papers.

The Unpublished Manuscripts series includes Memorabilia of Michigan’s Constitutional Convention, 1961-1962: A Guide to the Author’s Collection, The Wanger REO Collection, and Discovering Ingham County, a Descriptive Bibliography, all written by Eugene G. Wanger. The Ingham County Historical Commission papers consists of meeting agendas, minutes, and annual reports of the Ingham County Historical Commission from 1971 through 1988, correspondence relating to the activities of ICHC, newspaper articles, and personal correspondence. Also included is a copy of “A Brief History of the Ingham County Historical Commission, 1971-1981” written by Wanger. This series is arranged chronologically, with copies of the newspaper articles placed at the end of the series. The R.E. Olds Museum papers consists of meeting minutes and agendas, by-laws, reports, and correspondence from the Board of Trustees, Executive Committee, Search Committee, and other REOM committees. Also included are newspaper articles, newsletters, ephemera, and a copy of the REOM Conceptual Plan from 1980. For the first part of the series the original order provided by Eugene G. Wanger was maintained. The materials from 1977 to 1982, and 1985 to 1991are arranged chronologically. The materials from 1983 were divided into two categories: Board of Trustees and Executive Committee, and were arranged chronologically. The materials from 1984 were divided into three categories: Board of Trustees, Executive Committee, and Financial Reports, and were also arranged chronologically. Order was imposed on the remainder of the materials, which are arranged first by subject, then chronologically.

The Ingham County Government materials include county finances, correspondence, Animal Control, Board of Commissioners, Drain Commission, Road/Parks Commission, civil defense and other county department files. The Michigan State Government materials consist of Attorney General, Mental/Public Health, Social Services, the Treasury and other state government department files.

The political material consists of correspondence, campaign advertisements, and other political memorabilia associated with Ingham County, Michigan, and national elections. This section features the papers of the Ingham County Republican Party and campaign material from Republican candidates in local, state, and national elections.

The Tri-County Regional Planning Commission papers consist of pamphlets and regional reports for Clinton, Eaton, and Ingham Counties. The United States Government papers primarily of the Environmental Protection Agency and Department of Housing & Urban Development. Other subjects include Michigan State University, Lake Lansing Board, and Michigan Association of Counties.