The Ralph S. Regula Papers consist of materials dating from circa 1970s to 2000s. The collection represents the 36-year public service career of Ralph Regula as a Republican congressman in the U.S. House of Representatives for the 16th District of Ohio. All materials in the collection were compiled by the office of Congressman Regula, with the exception of the items pertaining to his various election campaigns, which were compiled by his campaign committees. Though many materials from his time in Congress during the 1970s are not included in this collection, the collection does document Regula’s committee work from the 1980s until his retirement in January 2009, especially his work as chairman of two subcommittees of the House Committee on Appropriations.

The collection includes materials showing Regula's work on the Appropriations Committee and subcommittees underneath it, such as budgets, congressional hearing records, committee reports, and subject files relating to issues dealt with by the subcommittees; similar files are found for other congressional committees Regula served on, such as the Budget Committee and the Select Committee on Aging. Also included is information on other projects and commissions Regula was involved with while in office, such as the steel caucus, trade, and the Martin Luther King, Jr. Federal Holiday Commission. Further series in the collection concern bills sponsored or co-sponsored by Regula, as well as his voting record.

The collection also contains materials such as constituent service files, media relations files, travel files, campaign files, and audiovisual materials, all of which serve to represent the work done by Regula outside of the chamber of the House of Representatives. Included in these series is publications for constituents, press releases, the "Regula Report" newsletter written by Regula, campaign ephemera, office files, newspaper clippings, and constituent mail. Finally, the collection contains audiovisual materials recording Regula's radio campaign advertisements, appearances on news programs, and public service announcements.

The Chalmers P. Wylie Papers, dated 1927, circa 1939 to 1990s, with a bulk of the material dating 1967 to 1992, documents the public service career of Wylie as a member of the United States House of Representatives for the 15th Congressional District for 26 years, January 1967- January 1993. While some files date from when Wylie was the Assistant Attorney General of Ohio, City Attorney of Columbus and a member of the Ohio House of Representatives, the majority of the collection documents Wylie's tenure in the United States House of Representatives and the records compiled by his office. The collection contains correspondence, bills, photographs, statements, reports, clippings, press releases, campaign files, speeches, negatives, audiocassette recordings, magnetic audiotapes, 35mm slides, 16mm film, VHS videocassette recordings and U-matic videocassette recordings. These materials highlight Wylie's various roles and responsibilities during his career, ranging from his legislative duties, House committees positions he held, his role in the Republican Party, and his interactions with the media and his district, including election campaigns.

The Donald E. Lukens Papers, dated 1954-1991 with a bulk of the material dating 1966-1974, contains correspondence, scrapbooks, case files, reports, photographs, awards, bills, political cartoons, requests, pamphlets, and questionnaires regarding Lukens' political career, and to a lesser extent, his personal life. Materials in the collection reflect the multiple roles that Lukens functioned under as a member of the United States House of Representatives and the Ohio Senate. Some materials, such as the bills and subject files, reflect Lukens' role as a legislator as he reviewed political issues and voted on bills. Other materials, such as correspondence, case files and requests from constituents highlight Lukens' role as a public servant. Lukens also engaged in other political activities such as running for office, being a member of the Republican Party and giving speeches at events within his district.

The majority of the collection focuses on Lukens' first term as United States Representative from 1966-1970, and on his time as an Ohio Senator from 1971-1986, with the latter materials focusing mainly on 1973-1974. There are a few scrapbooks that contain news clippings regarding the events that caused Lukens to resign from office, and other files that are about Lukens' 1987-1990 term as a congressman in the United States House of Representatives.

The William M. McCulloch Papers, dated circa 1905-2010, with the bulk of the material dating 1947-1972, document the public service career of McCulloch (R-Piqua) as a member of the United States House of Representatives for the 4th Ohio Congressional District for 26 years, from November 1947 to January 1973. Although a few items date from McCulloch’s terms in the Ohio General Assembly or from his personal life, including his childhood, and his military service in World War II, the vast majority of the collection consists of the records compiled by the Washington, D.C. office of Congressman McCulloch. The collection contains correspondence, invitations, clippings, campaign files, bills, reports, press releases, issue mail (letters from his constituents regarding certain policies or legislation), memoranda, photographs, certificates and artifacts. There are also a few materials from after McCulloch's death in 1980 that commemorate his legacy.