Oral history interview with Frank C. Cook conducted by Clark Hansen from November 29-30, 1989, as part of the Senator Mark O. Hatfield Oral History Project. Cook was an aide to Hatfield from 1969 to 1973.

Oral history interview with Jenna L. Dorn conducted by Clark Hansen from June 13-15, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Dorn was a legislative assistant to Hatfield from 1977 to 1981.

Oral history interview with Walter H. Evans, III conducted by Jim Strassmaier from June 6-9, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Evans served as an aide and legal counsel to Hatfield.

Oral history interview with Gerry Frank conducted by Jim Strassmaier from May 25, 1988, to May 2, 1990, as part of the Senator Mark O. Hatfield Oral History Project. Frank supported Hatfield's political career and served as his chief of staff.

Oral history interview with Thomas R. Getman conducted by James Strassmaier from June 3-8, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Getman was legislative director for Hatfield from 1978 to 1985.

Oral history interview with Mark O. Hatfield conducted by Clark Hansen from July 29, 1998, to May 22, 2002, as part of the Senator Mark O. Hatfield Oral History Project. Hatfield was an Oregon state legislator, Oregon secretary of state, Oregon governor, and a U.S. senator.

Oral history interview with J. Keith Kennedy conducted by Jim Strassmaier on June 8, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Kennedy was staff director for the Senate Appropriations Committee.

Autographed statement of U.S. Senator Harry Lane (1855-1917) regarding his position on the armed neutrality bill. The statement was written in response to criticisms of his position and claims that he had supported a filibuster of the bill. Lane was mayor of Portland, Oregon, from 1905 to 1909, and was a U.S. senator for Oregon from 1913 to 1917. Lane opposed the United States' entry into World War I, and he died while in office.

Interview with Wayne Morse conducted as part of his 1968 re-election campaign. Morse was a U.S. Senator from Oregon.

Oral history interview with Riki P. Sheehan conducted by Michael O'Rourke from June 2-11, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Sheehan was a caseworker and legislative assistant on Hatfield's staff.