11Francis Adrian Van der Kemp to Thomas Jefferson, 5 April 1818 (Jefferson Papers)
natural history; study of [index entry]
12Thomas Jefferson to Francis Eppes, 6 October 1820 (Jefferson Papers)
natural history; study of [index entry]
13Theodosius Hansford to University of Virginia Board of Visitors, 15 March 1822 (Jefferson Papers)
natural history; study of [index entry]