The C. Girard Davidson Papers document the career of attorney, politician, and businessman Crow Girard "Jebby" Davidson (1910-1996). The collection is organized into major series concerning government projects, legal cases, political activities, and business interests. The majority of material related to Davidson's service as Assistant Secretary of the Interior (1946-1950) is housed in the Truman Presidential Library in Independence, Missouri.

Wayne Lyman Morse (1900-1974) was a United States Senator from 1945-1969. He was a member of the Labor and Welfare Committee, Armed Services Committee, and Foreign Relations Committee and served as a delegate to the United Nations. The collection contains senatorial papers, 1944-1968, research material, arbitration decisions, speeches, financial material, mementos and personal and general correspondence.

Richard Lewis Neuberger (1912-1960), an Oregon native, was a U.S. Senator (D-OR) from 1954 to 1960. The Richard Neuberger collection consists of correspondence, legislation, published articles, and newspaper articles which pertain to the literary and political career of Richard Lewis Neuberger.

Harrison Spangler (1879-1965) was a Spanish-American war veteran who later served as a committee member and National Chairman of the Republican Party during the 1930-1940's, and after WWII became involved with Oregon politics. The collection consists of five major series: Wayne Morse, Robert Taft, Richard Neuberger, the Republican Party, and Harrison Spangler personal records.