1Louis Philippe Gallot de Lormerie to Thomas Jefferson, 14 April 1809 (Jefferson Papers)
agriculture; Philadelphia Society for Promoting Agriculture [index entry]
2William Thornton to Thomas Jefferson, 30 August 1809 (Jefferson Papers)
agriculture; Philadelphia Society for Promoting Agriculture [index entry]
3John Adlum to Thomas Jefferson, 15 February 1810 (Jefferson Papers)
agriculture; Philadelphia Society for Promoting Agriculture [index entry]
4Peter Minor to Thomas Jefferson, 17 September 1811 (Jefferson Papers)
agriculture; Philadelphia Society for Promoting Agriculture [index entry]
5Thomas Jefferson to Thomas Mann Randolph, 5 March 1817 (Jefferson Papers)
agriculture; Philadelphia Society for Promoting Agriculture [index entry]