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)
5Thomas Jefferson to Francis Adrian Van der Kemp, 16 March 1817 (Jefferson Papers)
6Francis Adrian Van der Kemp to Thomas Jefferson, 30 March 1817 (Jefferson Papers)
7Thomas Jefferson to Francis Adrian Van der Kemp, 1 May 1817 (Jefferson Papers)