1Benjamin Smith Barton to Thomas Jefferson, 13 July 1810 (Jefferson Papers)
Nor is this business of the extinction of species
2Thomas Jefferson to Francis Adrian Van der Kemp, 9 February 1818 (Jefferson Papers)
Barton, Benjamin Smith; and extinction of species [index entry] extinction; of species [index...
3Francis Adrian Van der Kemp to Thomas Jefferson, 5 April 1818 (Jefferson Papers)
extinction; of species [index entry]