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© The New York Public Library, 2025
The New York Public Library is a 501(c)(3) | EIN 13-1887440
General Research Division, The New York Public Library. "To William Maclure, President of the Academy of Natural Sciences of Philadelphia, and of the American Geological Society, member of the American Philosophical Society, &c. &c...." The New York Public Library Digital Collections. 1824 - 1828. https://digitalcollections.nypl.org/items/510d47da-63e6-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "To William Maclure, President of the Academy of Natural Sciences of Philadelphia, and of the American Geological Society, member of the American Philosophical Society, &c. &c...." New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/510d47da-63e6-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1824 - 1828). To William Maclure, President of the Academy of Natural Sciences of Philadelphia, and of the American Geological Society, member of the American Philosophical Society, &c. &c.... Retrieved from https://digitalcollections.nypl.org/items/510d47da-63e6-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-63e6-a3d9-e040-e00a18064a99 | title=
(text)
To William Maclure, President of the Academy of Natural Sciences of Philadelphia, and of the American Geological Society, member of the American Philosophical Society, &c. &c...., (1824 - 1828)
|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>