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 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.

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.

Oral history interview with Vera M. Springer conducted by Mary Mead in seven sessions, from August 9 to September 20, 1990, as part of the Oregon Legislature Oral History Series. Springer discusses her work for U.S. Senators Dick Neuberger and Maurine Neuberger from 1954 to 1966.