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Manuscripts and Archives Division, The New York Public Library. "Du Ponceau, Peter S. Philadelphia. To Monsieur Petit de Villers" The New York Public Library Digital Collections. 1800. https://old-digitalcollections.nypl.org/items/1e62a720-58d2-0133-6d5f-00505686d14e
Manuscripts and Archives Division, The New York Public Library. "Du Ponceau, Peter S. Philadelphia. To Monsieur Petit de Villers" New York Public Library Digital Collections. Accessed November 3, 2026. https://old-digitalcollections.nypl.org/items/1e62a720-58d2-0133-6d5f-00505686d14e
Manuscripts and Archives Division, The New York Public Library. (1800). Du Ponceau, Peter S. Philadelphia. To Monsieur Petit de Villers Retrieved from https://old-digitalcollections.nypl.org/items/1e62a720-58d2-0133-6d5f-00505686d14e
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/1e62a720-58d2-0133-6d5f-00505686d14e | title=
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Du Ponceau, Peter S. Philadelphia. To Monsieur Petit de Villers, (1800)|author=Digital Collections, The New York Public Library |accessdate=November 3, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>