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König, Rudolph. 1862, ca. [Letter to Franciscus Donders concerning phonautograph and Helmholtz resonators]. (University Museum Utrecht, Archive)
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ISSN 1866-4784: reference - xlink
Max Planck Institute for the History of Science, Berlin Institut für Information und Medien, Sprache und Kultur (I:IMSK), Universität Regensburg Fakultät Medien, Bauhaus-Universität Weimar