1Charles Willson Peale to Thomas Jefferson, 3 April 1809 (Jefferson Papers)
Godon, Silvain; mineralogical lectures of [index entry]
2Thomas Jefferson to Charles Willson Peale, 5 May 1809 (Jefferson Papers)
Godon, Silvain; mineralogical lectures of [index entry]
3Thomas Jefferson to Thomas Jefferson Randolph, 6 May 1809 (Jefferson Papers)
Godon, Silvain; mineralogical lectures of [index entry]
4Robert Patterson to Thomas Jefferson, 10 May 1809 (Jefferson Papers)
Godon, Silvain; mineralogical lectures of [index entry]