1Thomas Jefferson to Francis Adrian Van der Kemp, 16 March 1817 (Jefferson Papers)
2Thomas Jefferson to Francis Adrian Van der Kemp, 1 May 1817 (Jefferson Papers)
3Enclosure: "Sincerus" (Francis Adrian Van der Kemp) to Robert Aspland, 1 July [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)
6Francis Adrian Van der Kemp to Thomas Jefferson, 24 March 1816 (Jefferson Papers)
7Francis Adrian Van der Kemp to Thomas Jefferson, 4 June 1816 (Jefferson Papers)