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“Helmholtz Resonators By Rudolph Koenig”. n.d. Cleveland, OH: Case Western Reserve University.
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Koenig, Rudolph. 1889. Catalogue Des Appareils D'acoustique. Paris: Impr. de P. Mouillot.
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von Helmholtz, Hermann, and MPIWG. 2018. “Various Resonators From The Charité Collection”.
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von Helmholtz, Hermann, and MPIWG. 2018. “Various Resonators From The Charité Collection”.
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von Helmholtz, Hermann, and MPIWG. 2018. “Various Resonators From The Charité Collection”.
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MPIWG,, and Hermann von Helmholtz. 2018. “Various Resonators From The Charité Collection ”.
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MPIWG,, and Hermann von Helmholtz. 2018. “Various Resonators From The Charité Collection”.
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MPIWG,, and Hermann von Helmholtz. 2018. “Various Resonators From The Charité Collection”.
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von Helmholtz, Hermann, and MPIWG. 2018. “Resonator 5 From The Charité Collection”.
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von Helmholtz, Hermann, and MPIWG. 2018. “Resonator 6 From The Charité Collection”.