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You searched for: “Du Ponceau, Peter Stephen; and American Philosophical Society”
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1Peter S. Du Ponceau to Thomas Jefferson, 5 January 1818 (Jefferson Papers)
Du Ponceau, Peter Stephen; and American Philosophical Society [index entry] 
2Robert Patterson to Thomas Jefferson, 18 August 1810 (Jefferson Papers)
Du Ponceau, Peter Stephen; and American Philosophical Society [index entry] 
3John Vaughan to Thomas Jefferson, 12 February 1818 (Jefferson Papers)
Du Ponceau, Peter Stephen; and American Philosophical Society [index entry]