1Palisot de Beauvois to Thomas Jefferson, 19 March 1811 (Jefferson Papers)
Wistar, Caspar; mentioned [index entry]
2Charles Willson Peale to Thomas Jefferson, 14 November 1814 (Jefferson Papers)
Wistar, Caspar; mentioned [index entry]
3Charles Willson Peale to Thomas Jefferson, 23 December 1815 (Jefferson Papers)
Wistar, Caspar; mentioned [index entry]
4Eusebio Valli to Thomas Jefferson, 5 June 1816 (Jefferson Papers)
Wistar, Caspar; mentioned [index entry]