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 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 Freeman Holmer conducted by Michael O'Rourke from May 17-24, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Holmer was a professor at Willamette University and also served as Oregon director of elections and director of the Department of Finance and Administration under Mark Hatfield.