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 Loren D. Hicks conducted by Michael O'Rourke from April 18 to May 6, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Hicks served as assistant attorney general during Hatfield's tenure as Oregon secretary of state, and as legal counsel to Hatfield during his governorship.

Oral history interview with Sam H. Mallicoat conducted by Clark Hansen from May 23-27, 1988, as part of the Senator Mark O. Hatfield Oral History Project. Mallicoat was Hatfield's chief of staff from 1967 to 1973.