1Thomas Jefferson to William Hamilton, 7 May 1809 (Jefferson Papers)
poplar; Lombardy [index entry]
2Thomas Jefferson’s Notes on Poplar Forest Plantings and Geography, 1 February 1811–6 October 1821 (Jefferson Papers)
poplar; Lombardy [index entry]
3John H. Cocke to Thomas Jefferson, 26 March 1817 (Jefferson Papers)
poplar; Lombardy [index entry]
4Thomas Jefferson to John H. Cocke, 27 March 1817 (Jefferson Papers)
poplar; Lombardy [index entry]
5Thomas Jefferson to Joel Yancey, 17 January 1819 (Jefferson Papers)
poplar; Lombardy [index entry]