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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "The scientific volunteer. "If ever I have to choose....I shall, without hesitation, shoulder my rifle with the Orangemen." --See Professor Tyndall's reply to Sir W.V. Harcourt. "Times," Feb. 13, 1890." The New York Public Library Digital Collections. 1890-02-22. https://digitalcollections.nypl.org/items/4b639c00-dcf3-0130-9d80-58d385a7b928
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "The scientific volunteer. "If ever I have to choose....I shall, without hesitation, shoulder my rifle with the Orangemen." --See Professor Tyndall's reply to Sir W.V. Harcourt. "Times," Feb. 13, 1890." New York Public Library Digital Collections. Accessed February 9, 2025. https://digitalcollections.nypl.org/items/4b639c00-dcf3-0130-9d80-58d385a7b928
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. (1890-02-22). The scientific volunteer. "If ever I have to choose....I shall, without hesitation, shoulder my rifle with the Orangemen." --See Professor Tyndall's reply to Sir W.V. Harcourt. "Times," Feb. 13, 1890. Retrieved from https://digitalcollections.nypl.org/items/4b639c00-dcf3-0130-9d80-58d385a7b928
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/4b639c00-dcf3-0130-9d80-58d385a7b928 | title=
(still image)
The scientific volunteer. "If ever I have to choose....I shall, without hesitation, shoulder my rifle with the Orangemen." --See Professor Tyndall's reply to Sir W.V. Harcourt. "Times," Feb. 13, 1890., (1890-02-22)
|author=Digital Collections, The New York Public Library |accessdate=February 9, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>