1Joseph Fox to Thomas Jefferson, [ca. 15] January 1816 (Jefferson Papers)
For a number of years with much difficulty and expense I have employed myself in discovering...
2Thomas Jefferson to Joseph Fox, 6 February 1816 (Jefferson Papers)
I have duly recieved your favor of Jan. ___ informing me of your intention to publish the result...
3Joseph Fox to Thomas Jefferson, 25 March 1816 (Jefferson Papers)
I received your kind favour of Feb y 1816. —and thank you for your attention and...