1Thomas Jefferson to John Laval, 11 April 1819 (Jefferson Papers)
2John Laval to Thomas Jefferson, 19 April 1819 (Jefferson Papers)
3Enclosure: Invoice of Books for Thomas Jefferson Purchased from de Bure Frères, 24 June 1820 (Jefferson Papers)
4de Bure Frères to Thomas Jefferson, 26 June 1820 (Jefferson Papers)