1Francis Adrian Van der Kemp to Thomas Jefferson, 24 March 1816 (Jefferson Papers)
2Enclosure: "Sincerus" (Francis Adrian Van der Kemp) to Robert Aspland, 1 July [June?] 1816 (Jefferson Papers)
3Francis Adrian Van der Kemp to Thomas Jefferson, 4 June 1816 (Jefferson Papers)
4Francis Adrian Van der Kemp to Thomas Jefferson, 20 February 1817 (Jefferson Papers)
5Francis Adrian Van der Kemp to Thomas Jefferson, 30 March 1817 (Jefferson Papers)