Hermann von Helmholtz Letters and Other Papers, 1847-1891 (MS Ger 198). Houghton Library, Harvard University.
Hermann von Helmholtz Letters and Other Papers, 1847-1891 (MS Ger 198). Houghton Library, Harvard University. https://id.lib.harvard.edu/ead/hou00973/catalog Accessed August 18, 2022.
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