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 Tom J. Imeson conducted by Michael O'Rourke from September 14 to December 9, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Imeson served on Hatfield's staff from 1969 to 1985.

Oral history interview with Maurine B. Neuberger conducted by Clark Hansen from August 26 to December 12, 1991, as part of the Oregon Legislature Oral History Series. Neuberger served in the Oregon House of Representatives from 1951 to 1955 and in the U.S. Senate from 1960 to 1964.

Oral history interview with Bob Packwood conducted by Clark Hansen from January 26, 1996, to August 20, 2003, as part of the Oregon Legislature Oral History Series. Packwood was a U.S. senator from Oregon from 1969 to 1995. Packwood resigned from his seat after the Senate Ethics Committee recommended his expulsion following an investigation of allegations that he committed sexual misconduct.

Oral history interview with Mary Jane Sills conducted by Jim Strassmaier from August 8-11, 2003, as part of the Oregon Legislature Oral History Series. Sills was an aide to U.S. Senators Richard Neuberger and Maurine Neuberger of Oregon.

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.