The researcher should be aware of related collections held by the State Historical Society of Wisconsin. It is the nature of oral history that facts and assertions based on memory should be verified by reference to more reliable written sources. Relevant archival collections include:
- Records of the United Packinghouse Workers of America
- Records of UPWA Local 1, Ottumwa, Iowa
- Ralph Helstein papers
- Leon Beverly papers
- Svend Godfredsen papers
- Records of the Amalgamated Meat Cutters and Butcher Workmen of North America
The Society's collection also includes several oral histories not related to this project, but which concern packinghouse unionism. They include:
- Interviews with Ralph Helstein by Rick Halpern and Roger Horowitz
- Interview with Ralph Helstein from Roosevelt University
- Interview with Ralph Helstein from the Illinois Labor History Society
- Interview with Herbert March from Roosevelt University
- Interview with Herbert March from the Illinois Labor History Society
- Interview with Frank Ellis, University of Minnesota
- Interview with Joe Zabritsky from the Illinois Labor History Society
- Interview with Les Orear from the Illinois Labor History Society
- [Other ILHS interviews]
- Interview with Steve Mauser from the University of Texas
- Interview with Sam Twedell from the University of Texas
