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Manuscripts and Archives Division, The New York Public Library. "Eighteen pages of accounts, and twelve letters by Thomas Russell, Nathaniel Martin, Francis Phillips, and William Baxter concerning the Principio Company's iron works on the Potomac River" The New York Public Library Digital Collections. 1483 - 1876. https://qa-digitalcollections.nypl.org/items/bf8b8f49-2e80-c54e-e040-e00a1806277e
Manuscripts and Archives Division, The New York Public Library. "Eighteen pages of accounts, and twelve letters by Thomas Russell, Nathaniel Martin, Francis Phillips, and William Baxter concerning the Principio Company's iron works on the Potomac River" New York Public Library Digital Collections. Accessed November 29, 2024. https://qa-digitalcollections.nypl.org/items/bf8b8f49-2e80-c54e-e040-e00a1806277e
Manuscripts and Archives Division, The New York Public Library. (1483 - 1876). Eighteen pages of accounts, and twelve letters by Thomas Russell, Nathaniel Martin, Francis Phillips, and William Baxter concerning the Principio Company's iron works on the Potomac River Retrieved from https://qa-digitalcollections.nypl.org/items/bf8b8f49-2e80-c54e-e040-e00a1806277e
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/bf8b8f49-2e80-c54e-e040-e00a1806277e | title=
(text)
Eighteen pages of accounts, and twelve letters by Thomas Russell, Nathaniel Martin, Francis Phillips, and William Baxter concerning the Principio Company's iron works on the Potomac River, (1483 - 1876)|author=Digital Collections, The New York Public Library |accessdate=November 29, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>