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 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 Terry Thatcher, conducted by Clark Hansen in two sessions, on January 31 and March 15, 2000, as part of the Columbia River Dissenters Oral History Series. Thatcher discusses his work as an environmental lawyer for the National Wildlife Federation in Eugene, Oregon, from 1978 to 1982, and in Portland from 1982 to 1989.