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![Cover for Hermann L F Helmholtz · On the Sensations of Tone (Paperback Book) [2nd edition] (2007)](https://imusic.b-cdn.net/images/item/original/380/9781602066380.jpg?hermann-l-f-helmholtz-2007-on-the-sensations-of-tone-paperback-book&class=scaled&v=1411189422)