1John Barnes to Thomas Jefferson, 14 February 1810 (Jefferson Papers)
Hoffingan & Company (Paris firm) [index entry]
2John Barnes to Thomas Jefferson, 15 January 1812 (Jefferson Papers)
Hoffingan & Company (Paris firm) [index entry]
3John Barnes to Thomas Jefferson, 15 April 1811 (Jefferson Papers)
Hoffingan & Company (Paris firm) [index entry]
4John Barnes to Thomas Jefferson, 18 May 1812 (Jefferson Papers)
Hoffingan & Company (Paris firm) [index entry]