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![Cover for Ralph R. Leutenegger · Stuttering in Children and Adults: Thirty Years of Research at the University of Iowa (Paperback Book) [Minnesota Archive Editions edition] (1955)](https://imusic.b-cdn.net/images/item/original/094/9780816660094.jpg?ralph-r-leutenegger-1955-stuttering-in-children-and-adults-thirty-years-of-research-at-the-university-of-iowa-paperback-book&class=scaled&v=1464695614)