This site give access to many of David P. Boder’s recordings of interviews he conducted with Holocaust survivors.
In 1946, Dr. David P. Boder, a psychology professor from Chicago’s Illinois Institute of Technology, traveled to Europe to record the stories of Holocaust survivors in their own words. Over a period of three months, he visited refugee camps in France, Switzerland, Italy, and Germany, carrying a wire recorder and 200 spools of steel wire, upon which he was able to record over 90 hours of first-hand testimony. These recordings represent the earliest known oral histories of the Holocaust, which are available through this online archive. (from the site)
The site gives a wide range of useful background contextualisation to the project as well. Extremely valuable resource.