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