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© The New York Public Library, 2024
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Specifications of inventions... [Record 2: 1876 v.1:1 (Plates)- 1892 v.4:802 (Plates)]
General Research Division, The New York Public Library. "Newton's Specification." The New York Public Library Digital Collections. 1878-09-17. https://qa-digitalcollections.nypl.org/items/805d7137-12e6-053b-e040-e00a18065a65
General Research Division, The New York Public Library. "Newton's Specification." New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/805d7137-12e6-053b-e040-e00a18065a65
General Research Division, The New York Public Library. (1878-09-17). Newton's Specification. Retrieved from https://qa-digitalcollections.nypl.org/items/805d7137-12e6-053b-e040-e00a18065a65
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/805d7137-12e6-053b-e040-e00a18065a65 | title=
(still image)
Newton's Specification., (1878-09-17)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>