1Thomas Jefferson to David Gelston, 20 January 1816 (Jefferson Papers)
New York (city); Elgin Botanic Garden [index entry]
2Thomas Jefferson to David Hosack, 13 July 1816 (Jefferson Papers)
New York (city); Elgin Botanic Garden [index entry]
3David Hosack to Thomas Jefferson, 1 August 1816 (Jefferson Papers)
New York (city); Elgin Botanic Garden [index entry]
4Thomas Jefferson to David Hosack, 18 February 1818 (Jefferson Papers)
New York (city); Elgin Botanic Garden [index entry]
5Thomas Jefferson to Bernard Peyton, 18 February 1818 (Jefferson Papers)
New York (city); Elgin Botanic Garden [index entry]