The Billy Graham Center Archives in Wheaton, Illinois, (not to be confused with the Billy Graham Library in Charlotte, N.C.) has a wonderful collection of photos, recordings, and documents.
Among the recordings is a brief testimony Ruth gave at Billy Graham’s 1949 Los Angeles crusade. It’s brief, but her humor, passion for Christ, and her own love of evangelism comes through clearly. (Okay, maybe the audio quality makes it come through slightly less clear on some computers, but the Billy Graham Center Archives does offer a transcript, too.)