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Manuscripts and Archives Division, The New York Public Library. "Wachsmuth, Richard F.B. - Helmholtz's Gift to Science" The New York Public Library Digital Collections. 1870 - 1900. https://digitalcollections.nypl.org/items/c2a368d0-aa1e-0136-67bb-07be9e09f6f2
Manuscripts and Archives Division, The New York Public Library. "Wachsmuth, Richard F.B. - Helmholtz's Gift to Science" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/c2a368d0-aa1e-0136-67bb-07be9e09f6f2
Manuscripts and Archives Division, The New York Public Library. (1870 - 1900). Wachsmuth, Richard F.B. - Helmholtz's Gift to Science Retrieved from https://digitalcollections.nypl.org/items/c2a368d0-aa1e-0136-67bb-07be9e09f6f2
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Wachsmuth, Richard F.B. - Helmholtz's Gift to Science, (1870 - 1900)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>