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Pierre Samuel du Pont de Nemours (1739-1817) was a French political economist, writer, publisher, and public administrator. In 1800, accompanied by his sons, Victor Marie du Pont (1767-1827) and Eleuthère Irénée "E.I." du Pont (1771-1834), he arrived in America. In 1802, E.I. du Pont established E.I. du Pont de Nemours & Company, which began manufacturing gunpowder. This item is a letter written to President Thomas Jefferson about du Pont de Nemours' son, E.I. du Pont, as a gunpowder manufacturer and requesting Jefferson's opinon on the matter of refining saltpetre.