1Thomas Jefferson to William Hamilton, 7 May 1809 (Jefferson Papers)
trees; Lombardy poplar [index entry]
2John H. Cocke to Thomas Jefferson, 26 March 1817 (Jefferson Papers)
trees; Lombardy poplar [index entry]
3Thomas Jefferson to John H. Cocke, 27 March 1817 (Jefferson Papers)
trees; Lombardy poplar [index entry]