1Thomas Jefferson’s Account with Joseph Milligan, [8–10 March 1809] (Jefferson Papers)
McMahon, Bernard; The American Gardener’s Calendar [index entry]
2Bernard McMahon to Thomas Jefferson, 24 October 1812 (Jefferson Papers)
McMahon, Bernard; The American Gardener’s Calendar [index entry]
3Bernard McMahon to Thomas Jefferson, 1 December 1812 (Jefferson Papers)
McMahon, Bernard; The American Gardener’s Calendar [index entry]
4Mathew Carey & Son to Thomas Jefferson, 16 May 1818 (Jefferson Papers)
McMahon, Bernard; The American Gardener’s Calendar [index entry]
5Mathew Carey & Son to Thomas Jefferson, 5 July 1818 (Jefferson Papers)
McMahon, Bernard; The American Gardener’s Calendar [index entry]